Patent Publication Number: US-4481268-A

Title: Method of forming a photographic dye image

Description:
This invention relates to methods of forming a photographic dye image. 
     The photographic colour development process relies on the imagewise development of an exposed silver halide layer with a colour developing agent. The oxidized colour developing agent so formed then couples with a colour coupler to form an image dye. The literature of this process is vast and many references to the couplers and developers used in this process of colour photography are given in Bailey and Williams, The Photographic Color Development Process, Chapter 6, The Chemistry of Synthetic Dyes, Vol. 4, Ed. K. Venkataraman, Academic Press. 
     It is customary in presently available photographic colour materials to form azamethine dyes but proposals for the formation of azo dyes by photographic colour development have been made. Such proposals include the use of indazolone and 2-ethoxycarbonylindazolin-3-one couplers in British Patent Specifications Nos. 663,190 and 722,281 respectively while the use of isoxazolone couplers is described in British Patent Specification No. 778,089. 
     Dye images formed in the photographic colour development process have always displayed less than ideal fastness properties and although improvements have been made over the years, better fastness properties have always been desired. 
     It is known from the textile dye field and more recently in the photographic field from U.S. Pat. No. 4,142,891 that tridentate metallised azo dyes having chelating groups located adjacent each end of the azo linkage show superior fastness properties compared to their unmetallised counterparts. 
     The prior art describing the formation of image dyes by colour coupling development do not describe the formation of metallised dye images, nor do they describe the formation of dyes capable of forming tri- or higher-dentate metallised dye complexes. 
     The present invention now provides a method whereby photographic images of superior fastness properties are produced by a colour coupling development process which leads to the formation of dyes which are bi-, tri- or higher-dentate metal complexes. 
     According to the present invention there is provided a method of forming a photographic azo or azamethine dye image in an imagewise exposed photographic silver halide material, the method comprising the steps of 
     (a) developing the imagewise exposed material to form an imagewise pattern of oxidised colour developing agent, 
     (b) reacting the oxidised colour developing agent with a colour coupler to produce an image dye, 
     characterized in that at least one of the colour developing agent and the colour coupler possesses chelating sites such that the image dye is capable of forming a bi-, tri- or higher-dentate metallised dye, and 
     (c) contacting the image dye with polyvalent metal ions to form a metallised dye image. 
     The present invention also provides processed photographic elements containing metallised dye images formed by colour coupling development in accordance with the above method. 
     The colour couplers and colour developing agents can be known compounds, or known compounds can be modified for use in this invention. To be suitable for use in this invention at least one, and preferably both, of the coupler and the developing agent should possess a metal chelating group in such a location that, following coupling, a coordination complex can be formed between the chelating group or groups, the metal ion and nitrogen atom in the azo or azamethine linkage of the dye. 
     The metal chelating group can be any atom or moiety which will donate a pair of electrons to the metal ion used for metallisation. Preferred chelating groups contain a nitrogen or oxygen atom which forms the chelating site. Preferred chelating groups include hydroxy, amino, carboxy, sulfonamido and sulfamoyl as well as salts and hydrolyzable precursors of such groups. 
     Useful colour developing agents include phenylene diamines, aminophenols and arylhydrazides. If the developing agent is intended to be used with a colour coupler which does not possess a chelating group, the developing agent should possess such a group, preferably ortho to the nitrogen atom (e.g. in or attached to the 2-position of a phenylene diamine). 
     Useful colour couplers include phenols, naphthols, pyrazolones, pyrazolotriazoles and open chain ketomethylene compounds as well as other couplers illustrated below. If the developing agent intended to be used to form a dye image with the colour coupler does not possess a chelating group, then the colour coupler should have one, preferably attached to one of the positions adjacent the coupling position. 
     In a preferred embodiment of this invention, both the colour coupler and the colour developing agent each possess at least one chelating group so that following coupling a tri-/ or higher-dentate metallised dye can be formed. 
     In one embodiment of the invention a metallisable azo dye is formed using a colour coupler of the formula: ##STR1## wherein 
     X is --O-- or ═NY in which Y is --COR 1 , --COOR 1 , --SO 2  R 2 , --CONR 2  R 3  or --CSNHR 2 , the residue of X preferably forming a chelating group after coupling, 
     R 1  is an alkyl group of 1-4 carbon atoms, 
     R 2  is an alkyl, preferably having 1-20 carbon atoms, which is optionally substituted, (e.g. with --COOH, --SO 2  N(R 19 ) 2 , --OH, --SO 3  H, aryl or substituted aryl groups), or an aryl, preferably having 6-20 carbon atoms, which is optionally substituted (e.g. with --Br, --Cl, --F, --NO 2 , --COOH, --SO 3  H, --SO 2  N(R 19 ) 2 , or alkyl having 1-4 carbon atoms), 
     R 3  is H or an optionally substituted alkyl or aryl group as specified for R 2 , 
     each R 19  is H or an optionally substituted alkyl or aryl group as specified for R 2  or together they may form a heterocyclic ring, (e.g. morpholine or piperidine), 
     Z 1  represents the atoms necessary to complete a diffusible or non-diffusible coupler capable of forming a non-diffusible azo dye on coupling with an oxidised colour developing agent. 
     Examples of couplers of formula I include ##STR2## all of which optionally contain ballasting groups to render them non-diffusible wherein R 2  is as defined above and Ph is a phenyl group. One coupling with, for example, oxidised N,N-diethyl-p-phenylenediamine or an appropriately substituted N,N-diethyl-p-phenylenediamine, they form azo dyes as follows: ##STR3## 
     In another embodiment of the invention a metallisable azo dye is formed using a colour coupler of the formula: ##STR4## wherein X 1  is --N═ or ##STR5## where G is a chelating group, a salt thereof or a hydrolysable precursor thereof, 
     Y is --COR 1 , --COOR 1 , --SO 2  R 2 , --CONR 2  R 3  or --CSNHR 2 , 
     R 1 , R 2  and R 3  are as defined above, 
     Z 2  represents the atoms necessary to complete a diffusible or non-diffusible coupler capable of forming a non-diffusible azo dye on coupling with an oxidised colour developing agent. 
     Examples of couplers of formula II include 2-acetylindazolones of the formula: ##STR6## wherein G is as defined above and the 1H-pyrazolo[3,4-b]pyridine compound of the formula: ##STR7## both of which optionally contain ballasting groups to render them non-diffusible, and which couple with, for example, oxidised N,N-diethyl-2-carboxy-p-phenylenediamine to form the following azo dyes: ##STR8## 
     One class of colour developing agents which is especially useful in conjunction with couplers of formula I or II have the general formula: ##STR9## wherein 
     R 4  is --OH or --NR 2  R 3  (R 2  and R 3  being as defined above) and 
     G 2  is a chelating group. 
     Examples of groups which G 2  may represent are --COOH, --OH, --NHSO 2  R 2 , --CH 2  OH and --CH 2  NH 2 . 
     In another embodiment of the present invention a metallisable azamethine dye is formed by using a colour developing agent of formula (IV) above together with a suitable coupler. For example, a coupler of the formula: ##STR10## forms a metallisable indoaniline or indophenol dye with developing agent of formula IV in which G is carboxy as follows: ##STR11## Such a dye may be metallised, e.g. with nickel, to form a dye of the formula: ##STR12## wherein the coordination number of nickel could be satisfied by further ligands such as by the formation of a 2:1 dye:metal complex. 
     In a further embodiment of the invention the colour developing agent is a hydrazide of the formula: ##STR13## wherein 
     R 5  is an alkyl, preferably having 1-20 carbon atoms, aryl, preferably having 6-20 carbon atoms or heterocyclic group all of which are optionally substituted, (e.g. as exemplified for R 2 ), 
     X 2  is --N═ or ##STR14## 
     X 3  is --CO-- or, preferably, --SO 2  --, 
     Z 3  represents the atoms necessary to complete an aromatic carbocyclic or heterocyclic nucleus which is optionally substituted, and 
     G is as defined above, 
     If the developing agents of formula V are ballasted the ballast group may be present in either Z 3  or R 5 . 
     Examples of R 5  groups are methyl, phenyl, p-methyl-, p-chloro- or p-nitrophenyl, 3-chloro-5-nitrophenyl, or 2-, 3- or 4-pyridyl. Examples of nuclei which Z 3  may complete are pyridine, pyrimidine, quinoxaline, pyrazine, quinazoline and thiophene nuclei. 
     The developing agents of formula V couple, inter alia, with appropriate conventional couplers, e.g. phenol, naphthol, pyrazolone, 1H-pyrazolo[3,2-c]-s-triazole or open chain ketomethylene couplers, to form a bi-, tri- or higher-dentate azo dye. An example of such a coupling reaction is as follows: ##STR15## 
     Preferred groups of developing agents of formula V have the formulae: ##STR16## wherein 
     R 6  is hydrogen or alkoxy, preferably having 1-20 carbon atoms, e.g. methoxy, 
     R 7  is --NO 2 , --SO 2  R 8  or --COR 2 , 
     R 8  is a tertiary amino group, preferably a piperidino group, 
     R 9  is hydrogen or --NO 2 , 
     R 10  is alkyl or alkoxy, preferably containing 1-20 carbon atoms, e.g. --CH 3  or --OCH 3 , 
     R 11  is H, --NO 2  or --SO 2  N(R 2 ) 2 , 
     R 12  is H, aryl, substituted aryl, alkyl, substituted alkyl, (e.g. as exemplified for R 2  or --CF 3 ), heterocyclic, (e.g. 2-pyridyl), or --CN, 
     R 3 , R 6 , G and each R 2  are as defined above. 
     Especially preferred developing agents of the above classes are those having the formulae VI, X, XI and XII. 
     Examples of preferred values for R 2  in the above formulae include --CH 3 , --C 4  H 9  --n, --C 16  H 33  --n, phenyl, o- or p-methyl-, o- or p-chloro- and o- or p-nitro-phenyl. 
     In addition to the conventional colour couplers mentioned above, the sulphonylhydrazide developing agents and, in most cases the conventional p-phenylenediamine and p-aminophenol developing agents, will couple with the following classes of coupler compounds of formulae XVII or XXXV although the couplers may not necessarily couple in the same position with the sulfonylhydrazides as they do with the conventional developing agents. ##STR17## wherein 
     R 13  is R 5  --NHCO--, --CN, R 14  --O--CO--, ##STR18## R 5  NHSO 2  --, R 5  CO-- or p-nitrophenylsulphonyl, 
     R 14  is an alkyl, preferably having 1-20 carbon atoms, which is optionally substituted, (e.g. with --COOH, --SO 2  N(R 19 ) 2 , --OH, --SO 3  H, aryl or substituted aryl groups), 
     R 15  is hydrogen or an alkyl or aryl both of which are optionally substituted, (e.g., as specified for R 2 ), or where R 14  and R 15  are joined to the same nitrogen atom, they may together form a heterocyclic ring, (e.g. morpholine or piperidine), 
     R 16  is --O--R 14  or --SO 2  NH--R 15 , 
     R 17  is R 14  or --CONHR 14 , 
     R 18  is --OH or --NH 2 , 
     R 20  is R 2 , --NHCOR 2  or --NHR 2 , 
     R 21  is halogen or an alkyl or alkoxy, preferably having 1-20 carbon atoms, which is optionally substituted, e.g. with --COOH, --SO 2  N(R 19 ) 2 , --OH, --SO 3  H, aryl or substituted aryl groups. 
     R 5  and each R 2  are as defined above. 
     Especially preferred couplers have the formulae XVII, XIX, XX, XXIII and XXV. 
     Specific sulphonyl hydrazide developing agents are listed below in Table I. All alkyl groups in this and other tables are normal (unbranched) unless otherwise specified. 
     
                       TABLE I                                                     
______________________________________                                    
     ##STR19##                                                            
     ##STR20##                                                            
     ##STR21##                                                            
    R = CH.sub.3, C.sub.4 H.sub.9, C.sub.16 H.sub.33,                     
     ##STR22##                                                            
     ##STR23##                                                            
     ##STR24##                                                            
     ##STR25##                                                            
     ##STR26##                                                            
     ##STR27##                                                            
     ##STR28##                                                            
     ##STR29##                                                            
10.                                                                       
     ##STR30##                                                            
     ##STR31##                                                            
     ##STR32##                                                            
     ##STR33##                                                            
     ##STR34##                                                            
     ##STR35##                                                            
     ##STR36##                                                            
______________________________________                                    
 
    
     Specific couplers of formulae XVII to XXXV are listed below in Table II. 
     
                                           TABLE II                                
__________________________________________________________________________
 ##STR37##                   1.                                           
                                ##STR38##                    2.           
 ##STR39##                   3.                                           
                                ##STR40##                    4.           
 ##STR41##                   5.                                           
                                ##STR42##                    6.           
 ##STR43##                   7.                                           
                                ##STR44##                    8.           
 ##STR45##                   9.                                           
                                ##STR46##                    10.          
 ##STR47##                   11.                                          
                                ##STR48##                    12.          
 ##STR49##                   13.                                          
                                ##STR50##                    14.          
 ##STR51##                   15.                                          
                               16.STR52##                                 
 ##STR53##                   17.                                          
                                ##STR54##                    18.          
 ##STR55##                   19.                                          
                                ##STR56##                    20.          
 ##STR57##                   21.                                          
                                ##STR58##                    22.          
 ##STR59##                   23.                                          
                                ##STR60##                    24.          
 ##STR61##                   25.                                          
 ##STR62##                                26.                             
 ##STR63##                                27.                             
 ##STR64##                                28.                             
 ##STR65##                   29.                                          
                                ##STR66##                    30.          
 ##STR67##                   31.                                          
                                ##STR68##                    32.          
 ##STR69##                   33.                                          
                                ##STR70##                    34.          
 ##STR71##                   35.                                          
                                ##STR72##                    36.          
 ##STR73##                   37.                                          
 ##STR74##                    38. 39.                                     
                                ##STR75##                                 
__________________________________________________________________________
 
    
     The couplers and developing agents to be used in the present process may be prepared by organic preparative methods which are, in themselves, known. In particular benzisoxazolone couplers may be prepared as described in British Specification No. 778,089. Typical pyrazolone couplers may be prepared as described in British Specification No. 1,183,515 or U.S. Pat. No. 3,519,429 while typical β-keto-amide couplers may be prepared as described in British Specification No. 1,078,838 or U.S. Pat. No. 3,384,657. Typical pyrazolotriazole couplers may be prepared as described in British Specifications Nos. 1,252,418, 1,334,515, 1,340,191, 1,458,377 and Research Disclosure 12443 (1974). 
     The couplers and the colour developing agents employed herein may each be incorporated in the photographic material or dissolved in one of the processing solutions employed. A conventional arrangement is to incorporate ballasted coupler in the photographic material and to dissolve the developing agent in the developer solution. 
     In selecting a combination of colour developing agent and colour coupler for use in the present invention, it must be borne in mind that at least one of them and preferably both, should provide a chelating group adjacent to the azo or azamethine group in the image dye to be formed. The azo or azemethine groups themselves also act as coordinating sites thus forming bi or tri-dentate dyes. The structures of these reactants should be chosen so that, with the chelated metal ion, a 5- or 6-membered ring is formed with bi-dentate dyes and 5,5 5,6 or 6,6 two ring systems are formed with tridentate dyes. 
     In a preferred embodiment of the present invention the photographic material will have three colour forming units designed to produce a multicolour image. Such materials conventionally contain image-forming units sensitive to blue, green and red light capable of forming yellow, magenta and cyan dye images respectively. Each colour forming unit can be comprised of a single emulsion layer or of multiple emulsion layers sensitive to a given region of the spectrum. The layers of the element, including the layers of the colour-forming units, can be arranged in various orders as known in the art. In an alternative format, the emulsions sensitive to each of the three primary regions of the spectrum can be disposed as a single segmented layer, e.g., as by the use of microvessels as described in Whitmore U.S. patent application Ser. No. 184,714 filed Oct. 1, 1980 now U.S. Pat. No. 4,362,806, issued Dec. 7, 1982. 
     A typical multicolor photographic element would comprise a support bearing a cyan dye image-forming unit comprised of at least one red-sensitive silver halide emulsion layer having associated therewith at least one cyan dye-forming coupler, a magenta dye image-forming unit comprising at least one green-sensitive silver halide emulsion layer having associated therewith at least one magenta dye-forming coupler and a yellow dye image-forming unit comprising at least one blue-sensitive siler halide emulsion layer having associated therewith at least one yellow dye-forming coupler. The element can contain additional layers, such as metal providing layers, filter layers, interlayers, overcoat layers, subbing layers and the like. 
     The metal ions which may be employed to form the metal complex dyes are preferably ions of copper, nickel, chromium, cobalt, manganese or zinc. Metallisation may be achieved by incorporating a metal ion, preferably a metal ion which is chelated, in the photographic material. Best results will be obtained if the incorporated metal ion is kept away from the dye-forming reactants until after dye formation has occurred. Preferably, however, metallisation is effected by treatment with a solution containing metal ions. This solution may be the colour developer itself or preferably a subsequently used processing solution, for example an alkaline fix, or separate metallising solution. Metallisation can take place at pH 5.0-12.0 and at normal processing temperatures but usually metallisation will be more efficient at elevated temperatures and under alkaline conditions, e.g. pH 9.5-12. 
     Metal compounds may simply be dissolved in a processing solution, e.g. a fix solution, hence water-soluble salts may be used, for example, nickel sulphate or copper sulphate. A preferred separate metallising solution contains nickel or copper sulphate together with ammonium hydroxide at pH 11. The metal ions are preferably used at a concentration of from 0.1 to 100, preferably 1 to 15 g ion/liter. 
     The degree of metallisation can be improved by adding cationic surfactant to the metallising solution, for example benzyltributylammonium bromide, cetylpyridinium chloride, benzyltriphenylphosphonium chloride or cetyltrimethylammonium bromide which may be employed at concentrations of from 1 to 75, preferably 2 to 15 g/liter. 
     The colour development step may be carried out with a conventional colour developer solution containing an appropriate colour developing agent preferably at a pH of 10.5 to 12, especially at pH 11-11.6. Alternatively the colour developing agent may be incorporated in the photographic material and an alkaline activator used having a pH of 12.5-14. 
     It has been found that in many cases the presence of an electron transfer agent or development accelerator aids development and, with certain developing agents, is essential to the present colour development step. This is particularly so with the sulphonyl hydrazide developing agents and especially with the quinazoline compounds of formula XI. Examples of electron transfer agents are pyrazolidinones, for example 4-hydroxymethyl-4-methyl-1-phenylpyrazolidin-3-one which may be employed at concentrations of 0.05-5.0 preferably 0.1-1.0 g/liter. Examples of development accelerators are N-benzyl-α-picolinium bromide and bis-pyridinium methyl ether perchlorate which may be employed at concentrations of 0.2-10 preferably 1.0-5.0 g/liter. 
     The photographic silver halide materials to be used in the present invention may be of any of the structures and contain any of the additives as are described in Research Disclosure Item 17643 December 1978, published by Industrial Opportunities Ltd., Havant, Hampshire, U.K. 
     Development is followed by the conventional steps of bleaching, fixing, or bleach-fixing, to remove silver and silver halide, washing and drying. As indicated above, metallization can be performed during development or at any point in the process subsequently to development. 
    
    
     The following Preparations describe the preparation of compounds useful in the present invention. 
     DEVELOPING AGENTS 
     Preparation 1 (Method 1) 
     N&#39;-(4-Nitro-2-sulphamoylphenyl)methanesulphonylhydrazide ##STR76## 
     Sodium 2-chloro-5-nitrobenzenesulphonate (104 g, 0.4 mole) was added to thionyl chloride (240 ml ) and dimethylformamide (8 ml) added dropwise with cooling and vigorous stirring. After the initial vigorous reaction had subsided the mixture was stirred for 2 hours at 50° C. and then at 90° C. for 3 hours. The cooled mixture was poured onto a mixture of ice and water (4 l), the precipitate was filtered off, washed and then dried. The yield of crude product was 70 g, 68%. TLC analysis (CH 2  Cl 2 ) showed one spot of R f  =0.8. Spectroscopic data was consistent with 2-chloro-5-nitrobenzenesulphonyl chloride which was used crude in the next stage. ##STR77## 
     2-Chloro-5-nitrobenzenesulphonyl chloride (5.12 g, 20 mmole) was added in portions to liquid ammonia with stirring at -78° C. (methanol/dry-cold). The mixture was stirred for 0.5 h. and the excess ammonia then allowed to evaporate. The residue was crystallised from aqueous ethanol (1:1) to afford lustrous prisms of 2-chloro-5-nitrobenzenesulphonamide, 4.42 g, 93%, (m.p. 180°-187° C.). TLC analysis (CH 2  Cl 2 ) showed one spot (R f  =0.2). Spectroscopic data was consistent with the product. 
     C 6  H 5  ClN 2  O 4  S: Requires: C 30.4%, H 2.1%, N 11.8%. Found: C 30.3%, H 2.05%, N 11.7%. ##STR78## 
     2-Chloro-5-nitrobenzenesulphonamide (3.35 g, 14.2 mmole) was dissolved in ethanol (75 ml) with heating and hydrazine hydrate (5 ml. 100 mmole) added. The mixture was refluxed for 45 minutes and then allowed to cool to room temperature. The product cystallised in long needles, 2.4 g. A second crop was obtained on cooling the filtrate in an ice bath, 0.5 g. The combined crops were recrystallised from water (120 ml) to afford pure 2-hydrazino-5-nitrobenzenesulphonamide, m.p. 209°-210° C., 1.85 gm, 60% as orange-yellow needles. TLC analysis (EtOAc:petrol, 1:1) showed one spot (R f  =0.3). Spectroscopic data was consistent with the product. 
     C 6  H 8  N 4  O 4  S: Requires: C 31.0%, H 3.45%, N 24.1%, S 13.8%. Found: C 30.8%, H 3.4%, N 24.3%, S 13.6%. ##STR79## 
     2-Hydrazino-5-nitrobenzenesulphonamide (1.30 g, 5.6 mmole) was dissolved in dry tetrahydrofuran (25 ml) and pyridine (2 ml). Mesyl chloride (1.28 g, 11.2 mmole) was added dropwise with stirring, the mixture stirred for a further 2 h, and then poured into stirred water (250 ml) cooled to 0°-5° C. The solid was filtered off, 1.47 g, and crystallised from water (100 ml) to afford pure n&#39;-(4-nitro-2-sulphamoylphenyl)methanesulphonyl hydrazide, m.p. 211°-212° C. (dec), 1.1 g, 63% as long orange needles. TLC analysis (EtOAc) showed one spot (R f  =0.7). Analysis indicated the product crystallises as the hemi-hydrate, and was confirmed by spectroscopic data. 
     C 7  H 10  N 4  O 6  S 2 .1/2H 2  O: Requires: C 26.3%, H3.45%, N17.55% S 20.1%. Found: C 26.5%, H3.5%, N17.45% S 19.4%. 
     Preparation 2 (Method 1) 
     N&#39;-(5-nitro-2-pyridyl)methanesulphonhydrazide ##STR80## 
     5-Nitro-2-pyridylydrazine (10.6 g, 69 mmole) was suspended in pyridine (70 ml), cooled to -10° C. and methanesulphonyl chloride (7.9 g, 69 mmole) added dropwise with vigorous stirring. A clear yellow-orange solution was obtained, which was stirred at 20° C. for 1 h. and then poured into stirred water (500 ml) containing hydrochloric acid (10 ml). A solid began to separate from the solution. Cooling to 4° C. for 1 h. completed the separation of orange solid (probably a di-mesylated hydrazine which was discarded). The residual aqueous solution was extracted with ethyl acetate (5×200 ml) and the extract dried over anhydrous magnesium sulphate. Removal of the solvent afforded a yellow powder which was slurried with dichloromethane to remove a small amount of the orange impurity. The yield of pale beige product (m.p. 180°-182° C.) was 13.2 g, 82%. TLC analysis (1:1 ethyl acetate: 40°-60° petrol) showed one spot, and spectroscopic data confirms the structure. 
     C 6  H 8  N 4  O 4  S: Requires: C 31.0%, H 3.45%, N 24.1%. Found: C 30.6%, H 3.4%, N 24.2%. 
     Preparation 3 (Method 2) 
     N&#39;-(2-phenyl-4-quinazolinyl)-p-toluenesulphonyl hydrazide hydrochloride ##STR81## (a) 4-Chloro-2-phenylquinazoline (2.29 g, 9.5 mmole) was dissolved in dry tetrahydrofuran (30 ml) and mixed with a solution of tosylhydrazine (1.86 g, 10 mmole) in dry tetrahydrofuran (10 ml). The mixture was refluxed for 2 h. and allowed to stand at room temperature overnight. The creamy-yellow solid was filtered off, washed with tetrahydrofuran and air dried to afford the pure product, 4.04 g, 100%. TLC analysis (EtOAc) showed the product to be pure and spectroscopic data confirmed the structure. m.p. 230°-232° C. (dec). 
     C 21  H 18  N 4  O 2  S.HCl: Requires: C 59.1%, H 4.45%, N 13.1%. Found: C 58.8%, H 4.8%, N 13.3%. 
     Preparation 4 (Method 2) 
     N&#39;-(4-Quinazolinyl)methanesulphonylhydrazide hydrochloride ##STR82## 
     4-Chloro-quinazoline (0.70 g, 4.27 mmole) was added to a solution of mesylhydrazine (0.47 g, 4.27 mmole) in dry tetrahydrofuran (30 ml), the mixture refluxed for 3 h, then stood at 25° C. overnight. The yellow solid was filtered off, washed with tetrahydrofuran and air dried. The yield of pure product was 0.93% g, 79%. TLC analysis (EtOAc) and spectroscopic data showed the product to be pure, m.p. 207°-209° C. 
     C 9  H 10  N 4  O 2  S.HCl: Requires: C 39.3%, H 4.0%, Cl 12.9% N 20.4%, S 11.7%. Found: C 39.1%, H 4.1%, Cl 12.7%, N 20.5%, S 11.3%. 
     Preparation 5 
     N&#39;-(5-Nitro-2-pyridyl)acethydrazide ##STR83## 
     Acetyl chloride (0.51 g, 6.5 mmole) was added dropwise to a stirred solution of 2-hydrazino-5-nitropyridine (1.0 g, 6.5 mmole) in tetrahydrofuran (20 ml). Pyridine (0.51 g, 6.5 mmole) was added, the mixture stirred for 0.5 h, and then poured into water (200 ml). The aqueous solution was extracted with ethyl actate, the extract dried (MgSO 4 ) and the solvent removed under reduced pressure. Recrystallisation of the residue from 1,2-dichloroethane afforded the pure product, 1.1 g, 86%, as a cream coloured solid, m.p. 226°-227° C. 
     C 7  H 8  N 4  O 3  : Requires: C 42.9%, H 4.1%, N 28.6%. Found: C 42.9%, H 3.9%, N 28.2%. 
     Preparations 6-34 
     Further hydrazides were prepared by either Method 1 or Method 2 illustrated in Preparations 1-4 above. Each compound was used as developing agent in the photographic testing procedure described in Example 5 below. The maximum density and photographic speed were each measured and the compounds&#39; relative activity as a colour developing agent was assessed therefrom. Full details are recorded below in Table III. 
     
                                           TABLE III                               
__________________________________________________________________________
Sulphonylhydrazide Developers Prepared by Methods (1) and (2)             
                            Method &amp;                                      
                                  Relative*                               
                                       m.p.                               
                                           Fd.                            
No.                                                                       
   Structure                Yield (%)                                     
                                  Activity                                
                                       (°C.)                       
                                           Reqd.                          
                                               C  H  N  S  Other          
__________________________________________________________________________
    ##STR84##               (1) 46                                        
                                  v. poor                                 
                                       314- 215                           
                                           Fd. Reqd.                      
                                               28.6 28.4                  
                                                  4.0 4.05                
                                                     18.6 18.9            
                                                        20.9 21.6         
7                                                                         
    ##STR85##               (1) 44                                        
                                  fair 163- 170 (dec)                     
                                           Fd. Reqd.                      
                                               39.4 39.6                  
                                                  5.4 5.5                 
                                                     15.3 15.4            
                                                        17.7  17.6        
8                                                                         
    ##STR86##               (1) 90                                        
                                  poor 140- 141                           
                                           Fd. Reqd.                      
                                               53.1 53.1                  
                                                  8.2 8.5                 
                                                     10.6 10.8            
                                                        12.0 12.3         
9                                                                         
    ##STR87##               (1) 83                                        
                                  v. poor                                 
                                       170- 173                           
                                           Fd. Reqd.                      
                                               52.8 52.2                  
                                                  8.4 8.3                 
                                                     10.4 11.1            
                                                        12.0 12.65        
10                                                                        
    ##STR88##               (1) 65                                        
                                  v. good                                 
                                       209- 210                           
                                           Fd. Reqd.                      
                                               47.15 46.75                
                                                  4.0 3.9                 
                                                     17.7 18.2            
                                                        10.2 10.4         
11                                                                        
    ##STR89##               (1) 78                                        
                                  v. good                                 
                                       201- 202                           
                                           Fd. Reqd.                      
                                               44.6 44.9                  
                                                  3.5 3.4                 
                                                     19.4 19.05           
                                                        10.5 10.9         
12                                                                        
    ##STR90##               (1) 57                                        
                                  v. good                                 
                                       210- 211                           
                                           Fd. Reqd.                      
                                               40.0 40.2                  
                                                  2.85 2.7                
                                                     17.2 17.05           
                                                        9.6 9.7           
13                                                                        
    ##STR91##               (1) 57                                        
                                  v. good                                 
                                       206- 207                           
                                           Fd. Reqd.                      
                                               38.9 38.9                  
                                                  2.7 2.65                
                                                     20.65 20.65          
                                                        9.1 9.4           
14                                                                        
    ##STR92##               (1) 79                                        
                                  fair 103- 106                           
                                           Fd. Reqd.                      
                                               56.25 57.0                 
                                                  8.5 8.6                 
                                                     12.9 12.7            
                                                        7.0 7.2           
15                                                                        
    ##STR93##               (1) 77                                        
                                  v. good                                 
                                       126- 127                           
                                           Fd. Reqd.                      
                                               40.3 39.4                  
                                                  5.0 5.1                 
                                                     20.5 20.6            
                                                        11.0 11.7         
16                                                                        
    ##STR94##               (1) 48                                        
                                  v. good                                 
                                       224- 225                           
                                           Fd. Reqd.                      
                                               32.0 32.1                  
                                                  3.7 3.8                 
                                                     21.4 21.4            
                                                        11.8 12.2         
17                                                                        
    ##STR95##               (1) 67                                        
                                  good 177- 178                           
                                           Fd. Reqd.                      
                                               31.2 31.9                  
                                                  4.1 4.3                 
                                                     28.9  29.8           
                                                        15.7 17.0         
18                                                                        
    ##STR96##               (2) 93                                        
                                  v. good                                 
                                       246- 247                           
                                           Fd. Reqd.                      
                                               42.5 42.7                  
                                                  3.7 3.6                 
                                                     22.2 22.65           
19                                                                        
    ##STR97##               (1) 71                                        
                                  fair 156- 158                           
                                           Fd. Reqd.                      
                                               33.35 33.0                 
                                                  4.6 4.6                 
                                                     25.6 25.7            
                                                        14.3 14.7         
20                                                                        
    ##STR98##               (1) 88                                        
                                  good 215- 216                           
                                           Fd. Reqd.                      
                                               47.6 47.6                  
                                                  4.8 4.8                 
                                                     22.0 22.2            
                                                        12.35 12.7        
21                                                                        
    ##STR99##               (1) 83                                        
                                  good 250- 251                           
                                           Fd. Reqd.                      
                                               45.1 44.8                  
                                                  4.6 4.5                 
                                                     20.2 20.9            
                                                        11.7 11.9         
22                                                                        
    ##STR100##              (1) 7 v. good                                 
                                       222- 223                           
                                           Fd. Reqd.                      
                                               40.5 40.4                  
                                                  3.8 3.7                 
                                                     23.5 23.6            
                                                        10.7 10.8         
23                                                                        
    ##STR101##              (1) 50                                        
                                  poor 193- 194                           
                                           Fd. Reqd.                      
                                               56.8 57.3                  
                                                  4.5 4.5                 
                                                     17.0  17.8           
                                                        10.1 10.2         
24                                                                        
    ##STR102##              (2) 65                                        
                                  v. good                                 
                                       180- 182                           
                                           Fd. Reqd.                      
                                               54.95 54.2                 
                                                  4.75 4.8                
                                                     16.6 16.9            
                                                        9.1 9.6           
25                                                                        
    ##STR103##              (1)53 (2)47                                   
                                  v. good                                 
                                       214- 218                           
                                           Fd. Reqd.                      
                                               57.2 57.3                  
                                                  4.5 4.5                 
                                                     17.7 17.8            
                                                         9.7 10.2         
26                                                                        
    ##STR104##              (1) 45                                        
                                  good 107- 108                           
                                           Fd. Reqd.                      
                                               68.1 68.7                  
                                                  8.0 8.4                 
                                                     10.9 10.7            
                                                        5.9 6.1           
27                                                                        
    ##STR105##              (2) 92                                        
                                  good 300- 310 (dec)                     
                                           Fd. Reqd.                      
                                               55.1 55.4                  
                                                  4.4 4.4                 
                                                     11.2 11.2            
                                                           Cl 14.0 Cl     
                                                           14.3           
28                                                                        
    ##STR106##              (2) 90                                        
                                  good 270- 280 (dec)                     
                                           Fd. Reqd.                      
                                               53.6 53.5                  
                                                  4.1 3.8                 
                                                     14.6 14.85           
29                                                                        
    ##STR107##              (2) 16                                        
                                  v. good                                 
                                       255- 256- (dec)                    
                                           Fd. Reqd.                      
                                               39.8 39.2                  
                                                  3.0 2.9                 
                                                     18.6 18.3            
                                                        10.6 10.5         
                                                           F 18.5 F 18.6  
30                                                                        
    ##STR108##              (2) 66                                        
                                  v. good                                 
                                       201.5- 202.5                       
                                           Fd. Reqd.                      
                                               49.4 50.3                  
                                                  3.4 3.4                 
                                                     14.0 14.6            
31                                                                        
    ##STR109##              (2) 50                                        
                                  good 235- 236 (dec)                     
                                           Fd. Reqd.                      
                                                49.1 50.1                 
                                                  3.7 3.6                 
                                                     19.5 19.5            
32                                                                        
    ##STR110##              (2) 77                                        
                                  good 211- 212 (dec)                     
                                           Fd. Reqd.                      
                                               44.9 45.6                  
                                                  3.6 3.5                 
                                                     17.5 17.7            
                                                        8.2 8.1           
33                                                                        
    ##STR111##              (1) 50                                        
                                  v. good                                 
                                       208- 210                           
                                           Fd. Reqd.                      
                                               55.3 56.3                  
                                                  4.3 4.4                 
                                                     20.2 20.5            
                                                        9.6 9.4           
34                                                                        
    ##STR112##              (1) 45                                        
                                  v. poor                                 
                                       191- 192                           
                                           Fd. Reqd.                      
                                               41.9 41.7                  
                                                   4.3 4.35               
                                                     11.9 12.2            
                                                        14.1 13.9         
35                                                                        
    ##STR113##              (1) 39                                        
                                  fair 111-2                              
                                           Fd. Reqd.                      
                                               50.6 50.6                  
                                                  4.8 4.6                 
                                                     17.5 17.7            
                                                        13.4 13.5         
36                                                                        
    ##STR114##              (1) 35                                        
                                  fair 207-8                              
                                           Fd. Reqd.                      
                                               53.7 53.6                  
                                                  4.1 3.9                 
                                                     15.3 15.6            
                                                        8.9 8.8           
37                                                                        
    ##STR115##              (2) 8 good 200-1                              
                                           Fd. Reqd.                      
                                               44.5 44.2                  
                                                  3.9 3.7                 
                                                     18.2 18.7            
                                                        10.8 10.7         
38                                                                        
    ##STR116##              (2) 70                                        
                                  v. good                                 
                                       170-3                              
                                           Fd. Reqd.                      
                                               44.3 44.3                  
                                                  4.6 4.6                 
                                                     21.7 21.5            
__________________________________________________________________________
 *Relative Activity--This relates to the relative ease with which dyes can
 be formed from the sulphonylhydrazides and a standard coupler            
 
    
     COLOUR COUPLERS 
     Preparation 35 
     N-Hexadecylcyanoacetamide ##STR117## 
     A mixture of ethyl cyanoacetate (22.6 g, 0.2 mole), hexadecylamine (48.2 g, 0.2 mole), and tetrahydrofuran (200 ml) was refluxed for 1 h. and stirred overnight at room temperature to afford a white precipitate, 27.4 g. The filtrate was stirred for two days to afford a second crop of white precipitate, 11.5 g. The total yield of N-hexadecylcyanoacetamide was 38.9 g, 63% m.p. 95.5°-96.5° C. Spectroscopic data was consistent with the product. 
     C 19  H 36  N 2  O: Requires: C 74.0%, H11.7%, N 9.1%. Found: C74.4%, H 11.65%, N 8.9%. 
     Other couplers prepared by a similar route are: 
     N-[4-(2,4-di-t-pentylphenoxy)butyl]cyanoacetamide. 
     N-{4-[2-(cyanoacetamide)ethyl ]phenyl }-3-(2,4-di-t-pentylphenoxy) butanoamide. 
     Requires: C 73.66%, H 8.51%, N 8.32%. Found: C 73.56%, H 8.83%, N 7.88%. 
     Preparation 36 
     N-(3-hydroxyphenyl) hexadecylsulphonamide ##STR118## 
     Hexadecyl sulphonyl chloride (9.74 g, 30 mmole) in tetrahydrofuran (20 ml) was added portionwise to a stirred solution of 3-aminophenol (3.77 g, 34.6 mmole) in tetrahydrofuran (15 ml) and pyridine (15 ml). The mixture was stirred for 2.5 h. and then poured into 1NHCl solution (600 ml). The crude product was filtered off, washed with water and dried, 11.66 g. Short column chromatography (Florisil/ether) gave the pure product, m.p. 90.5°-91.5° C., was white flakes, 9.75 g, 82%. Spectroscopic data confirmed the structure. &#34;Florisil&#34; is a trade mark. 
     C 22  H 39  NO 3  S: Requires: C 66.5%, H 9.8%, N 3.5%. Found: C66.75%, H 9.7%, N 3.5%. 
     Other couplers prepared by a similar route are: 
     N-(3-hydroxy-4-methylphenyl) hexadecylsulphonamide 
     C 23  H 41  NO 3  S: Requires: C 67.15%. H 10.0%, N3.3%, S 7.6%. 
     N-(5-hydroxy-2-methylphenyl) hexadecylsulphonamide 
     C 23  H 41  NO 3  S: Requires: C 67.15%, H 10.0%, N 3.4%. Found: C 66.7%, H 10.0%, N 3.2%. 
     N-[3-(3-hydroxybenzenesulphamoyl)phenyl]-2-(3-t-butyl-4-hydroxyphenoxy)tridecanoamide 
     C 36  H 50  N 2  O 6  S: Requires: C 67.7%, H 7.8%, N 4.4%. Found: C 67.2%, H 7.7%, N 4.28%. 
     N-[3-(3-hydroxybenzenesulphamoyl)phenyl]pentadecanoamide 
     C 28  H 42  N 2  O 4  S: Requires: C 66.9%, H 8.4%, N 5.6%. Found: C 67.2%, H 8.4%, N 5.6%. 
     N-(3-hydroxyphenyl)-2,4,6-triisopropylbenzenesulphonamide 
     C 21  H 29  NO 3  S: Requires: C 67.2%, H 7.7%, N 3.7%. Found: C 66.8%, H 7.6%, N 3.8%. 
     N-(2-hydroxyphenyl)hexadecylsulphonamide 
     Requires: C 66.50,%, H 9.82%, N 3.53%, S 8.06%. Found: C 66.26%, H 9.69%, N 3.58%, S 8.02%. 
     N-(4-hydroxyphenyl)hexadecylsulphonamide 
     Requires: C 66.50%, H 9.82%, N 3.53%, S 8.06%. Found: C 66.14%, H 9.96%, N 3.57%, S 7.96%. 
     Preparation 37 
     N-Hexadecyl-3,5-dihydroxybenzamide ##STR119## 
     3,5-Dihydroxybenzoic acid (30.8 g, 0.2 mole) was refluxed with acetic anhydride (50 ml) for 15 minutes, cooled and poured into stirred water (500 ml). The mixture was brought to the boiling point and the clear solution allowed to cool overnight at 4° C. The product was obtained as white needles, m.p. 154°-156° C., 35.0 g. 74%. Spectroscopic data was consistent with the product. 
     C 11  H 10  O 6  : Requires: C 55.5%, H 4.2%. Found: C 55.7%, H 4.3%. ##STR120## 
     3,5-Diacetoxybenzoic acid (17.0 g, 71.4 mmole) was added to thionyl chloride (50 ml) and heated under refulx for 30 minutes. Excess thionyl chloride was removed by vacuum distillation. Dichloromethane was added to the residue (50 ml) and then evaporated (helps to remove last traces of thionyl chloride). On cooling, the pale straw coloured liquid solidified to a mass of needles. This was used as such in the next stage. The acid chloride was dissolved in tetrahydrofuran (100 ml) and a solution of hexadeclyamine (34.4 g, 142.8 mmole) in tetrahydrofuran (430 ml) added in one portion with vigorous stirring. After 15 minutes the amine hydrochloride was filtered off and washed with tetrahydrofuran. The combined filtrate was washings were evaporated to approximately 300 ml and the poured into 1N hydrochloric acid (3l). The product was obtained as a fine white precipitate which was filtered off, washed with water and dried, 28.82 g, 82%, m.p. 100°-102° C. 
     C 27  H 43  NO 5  : Requires: c 70.3%, H 9.3%, N 3.0%. Found: C 69.8%, H 9.5%, N 2.7%. ##STR121## 
     N-Hexadecyl-3,5-diacetoxybenzamide (28.8 g, 62.5 mmole) was suspended in methanol (500 ml) and purged with nitrogen. A similarly purged solution of potassium hydroxide in water (35 g, 0.625 mole in 50 ml) and methanol (100 ml) was added to the suspension with stirring, and stirred for 2 h. under nitrogen. The resulting solution was poured into 1N hydrochloric acid (5l) and the white precipitate filtered off, washed and dried. The product was recrystallised from aqueous ethanol (200 ml H 2  O+130 ml ethanol) to afford pure product, 22.11 g, 94%, m.p. 122°-124° C. TLC analysis (EtOAc) showed one spot and spectroscopic data was consistent. 
     C 23  H 39  NO 3  : Requires: C 73.2%, H 10.3%, N 3.7%. Found: C 73.4%, H 10.4%, N 3.7%. 
     Other couplers prepared by a similar route are: 
     N-Hexadecyl-2,4-dihydroxybenzamide, m.p. 85°-86° C. 
     C 27  H 39  NO 3  : Requires: C 73.2%, H 10.3%, N 3.7%. Found: C 72.8%, H 10.7%, N 3.6%. 
     N-Hexadecyl-2-(4-hydroxy-1-naphthoxy)propionamide, m.p. 72°-73° C. 
     C 29  H 45  NO 3  : Requires: C 76.5%, H 9.9%, N 3.1%. Found: C 76.45%, H 9.8%, N 3.0%. 
     N-Hexadecyl-3-hydroxy-2-naphthamide, m.p. 98°-100° C. 
     C 27  H 41  NO 2  : Requires: C 78.8%, H 10.0%, N 3.4%. Found: C 78.5%, H 10.0%, N 3.0%. 
     Preparation 38 
     N-Hexadecyl-4-hydroxynaphthalene-1-sulphonamide ##STR122## 
     Sodium 4-hydroxynaphthalene-1-sulphonate (50 g, 0.205 mole) was dissolved in 5% aqueous sodium hydroxide solution (200 ml, 0.25 mole) and stirred at 0° C. while ethyl chloroformate (24.3 g, 0.225 mole) was added dropwise. The mixture was stirred at 0°-5° C. for 5 h, during which time a solid precipitated out of solution. The grey solid was filtered off and dried at 60° C. under vacuum. 
     The yield of crude material was 50.24 g, 77%. ##STR123## 
     Crude sodium 4-ethoxycarbonyloxynaphthalene-1-sulphonate (50 g, 0.157 mole) and phophorus pentachloride (100 g, excess) were intimately mixed and heated on a steam bath with stirring for 0.5 h, and the poured onto crushed ice-water (3l) while still warm. After stirring for 0.5 h, the sticky olive coloured solid was filtered off, dissolved in dichloromethane, washed with water, and dried over magnesium sulphate. 
     The dichloromethane solution was reduced in volume and passed through a short column (Florisil-CH 2  Cl 2 ) to afford a yellow solution. Evaporation of the solvent gave pure product as a pale yellow crystalline mass, 40,4 g, 82%. TLC analysis (CH 2  Cl 2 ) showed one spot (R f  =0.9) and spectroscopic data was consistent with the required product. ##STR124## 
     4-Ethoxycarbonyloxy-1-naphthalenesulphonyl chloride (40.0 g, 128.5 mmole) was dissolved in tetrahydrofuran (100 ml) and a solution of hexadecylamine (31.0 g, 128.5 mmole) amd pyridine (10.2 g, 129 mmole) in tetrahydrofuran (200 ml) was added with stirring. The mixture was stirred for 2 h, filtered, and the filtrate poured into water (3l) containing concentrated hydrochloric acid (20 ml). The gum that was obtained was dissolved in ethyl acetate, washed and dried. The solvent was removed, (TLC analysis 1:3 EtOAc :petrol) showed several products at this stage--though one was predominant) and the residue crystallised twice from methanol to afford a beige solid, 22.76 g, 34%. The product had a purity of ˜95% by spectroscopic criteria. ##STR125## 
     4-Ethoxycarbonyloxy-N-hexadecylnaphthalene-1-sulphonamide (21.5 g, 41.4 mmole) was added to liquid ammonia (250 ml), in portions with stirring, at -78° C. (acetone-drycold bath). The mixture was stirred for 1 h, and the excess ammonia allowed to evaporate. The residue was dissolved in ethyl acetate, washed with water and dried (MgSO 4 ). Removal of the solvent gave a pale brown oil which was dissolved in hot dichloromethane (100ml) and then cooled in an ice-bath. The off-white precipitate was collected and dried in air to yield pure N-hexadecyl-4-hydroxynaphthalene-4-sulphonamide, 7.7 g, 42%. TLC analysis (1:3 EtOAc : 40°-60° petrol) showed one spot (R f  =0.4) and spectroscopic data was consistent with the product. 
     C 26  H 41  NO 3  S: Requires C 69.8%, H 9.2%, N 3.1%. Found: C 69.9%, H 9.1%, N 3.2%. 
     Preparation 39 
     N,N-dioctadecyl-5-benzenesulphonamido-1-hydroxy-2-naphthamide ##STR126## 
     5-Amino-1-hydroxy-2-naphthoic acid (20.3 g, 0.1 mole) was dissolved in tetrahydrofuran (500 ml), water (50 ml) and pyridine (15.8 g, 0.2 mole). Benzene sulphonyl chloride (20 g, 15 ml, 0.113 mole) was added with stirring. The mixture was stirred for 3 h, poured into vigorously stirred 1N hydrochloric acid (6l) and the grey precipitate filtered off, washed with water and dried. The yield of product was 23 g, 67%. TLC analysis (5% HOAc in EtOAc) showed one spot (blue fluorescence) and spectroscopic data was consistent with the proposed structure. 
     C 17  H 13  NO 5  S: Requires: C 59.5%, H 3.8%, N 4.1%. Found: C 59.1%, H 3.9%, N 4.0%. ##STR127## 
     5-Benzenesulphonamido-1-hydroxy-2-naphthoic acid (22.0 g, 64 mmole) was suspended in a mixture of dry methylene chloride (500 ml), thionyl chloride (17 ml, 236 mmole) and dimethyl formamide (1ml). The mixture was stirred and heated under reflux for 2 h. The solution was cooled and refrigerated for 1 h. The precipitated acid chloride was filtered off, washed with dry methylene chloride until the washings were pale yellow, and dried at 40° C. under vacuum. The yield of product was 16.21 g, 70%, A sample dissolved in hot methanol and subjected to TLC analysis (2:1 EtOAc :petrol) showed one major spot (R f  =0.8, run as ester) and a small amount of dark baseline material. The product was used crude in the next stage. ##STR128## 
     5-Benzenesulphonamido-1-hydroxy-2-naphthoyl chloride (8.0 g, 22.1 mmole, crude) was suspended in dry tetrahydrofuran (50 ml) and dioctadecylamine (23 g, 44.2 mmole) in warm tetrahydrofuran (100 ml) added with stirring. A thick precipitate was obtained which was stirred overnight. The amine hydrochloride was removed by filtration, washed with tetrahydrofuran and the washings combined with the filtrate. Removal of the solvent gave a dark oil which was taken up in ether and passed through a Florisil plug to remove dark baseline material. The eluate was evaporated to dryness and chromatographed on a Florisil column. A minor impurity (note 1) was removed with methylene chloride: 40°-60° petrol (1:1) and the product was isolated using ether as eluant. The yield of pure product was 2.6 g, 14%. TLC analysis (CH 2  Cl 2 ) showed one spot (R f  =0.5). Spectroscopic data was consistent with the proposed structure. 
     C 53  H 86  N 2  O 4  S: Requires: C 75.2%, H 10.2%, N 3.3.%. Found: C 75.2%, H 10.1%, N 3.3%. 
     Note 1: The impurity was identified as N-octadecyl-5-benzenesulphonamido-1-hydroxy-2-naphthamide. 
     Preparation 40 
     N-Hexadecyl-1-acetyl-2,1-benzisoxazolone-4-carboxamide ##STR129## 
     The title compound was prepared by the method described by J. M. Woolley in British Specification No. 778,089 (1957). 
     Preparation 41 
     2-Acetyl-3-hydroxy-6-methyl-2H-pyrazolo[3,4-b]pyridine ##STR130## 
     (a) 2-Hydroxy-6-methyl-nicotinic acid (3.6 g, 0.02 m) was heated at 125° for 2 hours with phosphorus oxychloride (10 ml). The reaction mixture was poured onto ice, the solid was collected and crystallised from aqueous ethanol to give colourless fine needles of 2-chloro-6-methylnicotinic acid (72%). 
     C 7  H 6  ClNO 2  : Requires: C 49.0%, H 3.5%, Cl 20.7%, N 8.2%. Found: C 49.15%, H 3.8%, Cl 20.85%, N 8.5%. 
     The n.m.r. spectrum (DMSO) showed signals at δ 2.58 (Ar.CH 3 , singlet). 7.40 (1H, doublet), 8.12 (1H, doublet), 10.38 (COOH, broad peak). 
     Molecular ion  m  /e 171. 
     (b) 2-Chloro-6-methyl nicotinic acid (3.5 g, 0.02 m) was refluxed with hydrazine hydrate (5 ml) and absolute alcohol (20 ml) for 5 hours. The solid was separated, washed with alcohol and crystallised from water to yield 50% of 2-hydrazino-6-methylnicotinic acid. 
     C 7  H 9  N 3  O 2  : Requires: C 50.3%, H 5.4%, N 25.4%. Found: C 50.4%, H 5.5%, N 25.5%. 
     The n.m.r. spectrum (DMSO) showed signals at δ 2.37 (CH 3  -Ar, singlet), 6.42 (1H, singlet), 6.86 (NH.NH 2 , broad peak), 7.90 (1H, doublet), 9.60 (COOH, broad peak). 
     Molecular ion  m  /e 167. 
     (c) 2-Hydrazino-6-methyl nicotinic acid (1.7 g, 0.01 m) was refluxed with water (5 ml) and concentrated hydrochloric acid (10 ml) for 5 hours. The solution was concentrated to one third of the original volume, cooling gave yellow fine needles of 3-hydroxy-6-methyl-1H-pyrazolo[3,4-b]pyridine (58%) as the hydrochloride. 
     C 7  H 8  ClN 3  O: Requires: C 45.3%, H 4.3%, Cl 19.1% N 22.7%. Found: C 45.6%, H 4.45%, Cl 19.4%, N 22.8%. 
     The n.m.r. spectrum (DMSO) showed signals at δ 2.75 (CH 3  -Ar, singlet), 7.18 (1H, doublet), 8.48 (1H, doublet). 
     Molecular ion  m  /e 149. 
     (d) 3-Hydroxy-6-methyl-1H-pyrazolo[3,4-b] pyridine HCl (2 g) was stirred at room temperature with acetic acid (5 ml) and acetic anhydride (10 ml) for 4 hours in presence of pyridine (2 ml) to give the monoacetylated product, crystallised from aqueous ethanol (49%). 
     C 9  H 9  N 3  O 2  : Requires C 56.5%, H 4.7%, N 22.0%. Found: C 56.5%, H 4.7%, N 22.1%. 
     Molecular ion  m  /e 191. 
     Preparation 42 
     Ethyl 4-(2,4-di-t-pentylphenoxy)butylcarbamoyl acetate ##STR131## 
     4-(2,4-Di-t-pentylphenoxy)butylamine (3.05 g, 0.01 m) in dry pyridine (20 ml) was cooled to 0°-5° C. in an ice bath. Ethyl malonyl chloride (1.05 g, 0.01 m) was added dropwise keeping the temperature at 0°-5° C. The reaction mixture was stirred at room temperature for 8 hrs. and then was poured onto ice and conc. hydrochloric acid (5 ml). The yellow sticky gum was extracted with ethyl acetate. Thin layer chromatography using eluant ethyl acetate-petroleum ether (40°-60°) (4:1), showed one major spot and baseline material. Column chromatography afforded a yellow liquid which on cooling solidified, (mp 35°) in 75% yield. The product was characterised by its accurate mass spectrum and N.M.R. 
     C 25  H 41  NO 4  : Requires: C 71.6%; H 9.8%, N 3.3%. Found: C 72.0%, H 10.0%, N 3.7%. 
     Preparation 43 
     (i) Ethyl 2-(4-nitrophenylthio)acetate ##STR132## 
     Sodium metal (3.6 g, 0.16 m) was dissolved in ethanol (250 ml) and 4-nitrothiophenol (25 g, 0.13 m) was added to it. To the above mixture was added ethyl chloroacetate (16.0 g). After refluxing for 1 hr, the suspension was filtered. The filtrate was concentrated (50 ml) and allowed to cool, precipitation occurred. The product was collected and dried under vacuum to afford yellow crystals 78% yield, mp. 43°-45° C. It was characterised by spectroscopic analysis. 
     C 10  H 11  NO 4  S: Requires: C 49.8%, H 4.6% , N 5.8%, S 13.3%. Found: C 49.4%, H 4.6%, N 6.0%, S 13.3%. 
     (ii) Ethyl 2-(4-nitrophenylsulphonyl)acetate ##STR133## 
     The previous product ester (2.41 g) was dissolved by warming in acetic acid (15 ml) and acetic anhydride (5 ml). It was then cooled in an ice bath (0°-5° C.), hydrogen peroxide (100 vol, 10 ml) was added and stirred for 1 hr. at 0°-5° C. The suspension was then stirred at room temperature for further 2 hrs, after which was poured on to ice and stirred for another half hour. The solid so formed was collected, crystallised from ethanol/40°-60° petrol as colourless needles mp. 76°-77°, 70% yield. The structure was characterised by spectroscopic analysis. 
     C 10  H 11  NO 6  S: Requires: C 43.9%, H 4.0%, N 5.1%, S 11.7%. Found: C 43.7%, H 3.9%, N 4.9%, S 11.8%. 
     (iii) 2-(4-nitrophenylsulphonyl)-N-[4-(2,4-di-t-pentylphenoxy)butyl]acetamide ##STR134## 
     The previous product ester (2.58 g, 0.01 m) and 2,4-di-t-pentylphenoxy-4-butylamine (3.05 g, 0.01 m) was refluxed on a steam bath in tetrahydrofuran (20 ml) for 6 hrs. The solvent was evaporated under vacuum to give a yellow liquid. Column chromatography on silica (ethyl acetate:pet. ether--4:1) afforded a yellow liquid which solidified mp. 36°-37° in 80% yield. 
     The structure was characterised by spectroscopic analysis. 
     C 28  H 40  N 2  O 6  S: Requires: C 63.2%, H 7.5%, N 5.3%, S 6.0%. Found: C 63.4%, H 7.8%, N 5.6%, S 6.3%. 
     The following Examples are included for a better understanding of the invention. The following words used therein are trade marks: Araldite, Alkanol, Ektalux and Tinuvin. 
     EXAMPLE 1 
     Metallisable dyes from unballasted couplers 
     A convenient test-tube method for evaluating unballasted couplers consists of dissolving the coupler and developer in 10% sodium carbonate solution, and adding excess potassium persulphate. The oxidised colour developer couples to give the unmetallised azo dye. After 30 seconds, a strip of mordant coating (shown in structure A) is then dipped in the reaction mixture and the azo dye is mordanted and metallised. The strip is washed briefly in running water and then dried. A number of metallised azo dyes formed this way are shown in Tables A and B. Couplers which have the desired activity and give the desired hues can be incorporated in a colour developer composition or can be ballasted and incorporated into the photographic layer (see Example 2) 
     
         ______________________________________                                    
Coating A (g/sq. meter)                                                   
______________________________________                                    
       Mordant 1      2.152                                               
       Gelatin        2.152                                               
       Hardener 2     0.215                                               
       NiSO.sub.4     0.58                                                
       Gelatin        1.08                                                
       Hardener 2     0.108                                               
       HCHO           0.108                                               
Polyethylene terephthalate film base                                      
______________________________________                                    
 Mordant 1  poly(1vinylimidazole) partially quaternised (10%) with        
 2chloroethanol-                                                          
 Hardener 2  Araldite Diluent DY 022  1,4butane dioldi-glycidyl ether.    
 
    
     
                       TABLE A                                                     
______________________________________                                    
Dyes formed on mordant (coating A) using nitro-                           
pyridylsulphonylhydrazide, Structure 3, Table I                           
and various unballasted couplers.                                         
Coupler        Hue      λ max (nm)                                 
                                   HBW (nm)                               
______________________________________                                    
(a)  ethylacetoacetate                                                    
                   orange/  475      79                                   
                   yellow                                                 
(b)  ethylcyanoacetate                                                    
                   lemon/   456      64                                   
                   yellow                                                 
(c)  citrazinic acid                                                      
                   magenta  542      83                                   
(d)  m-dimethylamino-                                                     
                   deep     568      79                                   
     phenol        magenta  (shoulder                                     
                            540)                                          
(e)  3,5-dihydroxy magenta  548      93                                   
     benzoic acid                                                         
(f)  2-methyl      magenta  535      95                                   
     resorcinol                                                           
(g)  resorcinol    magenta  535      96                                   
(h)  m-hydroxy benzoic                                                    
                   blue     600      89                                   
     acid          cyan     (shoulder                                     
                            555)                                          
(i)  naphthol type cyan     627      106                                  
     (see below)                                                          
(j)  hydroxynaphthalene                                                   
                   blue     590/628  130                                  
     5-sulphonic acid       double peaks                                  
(k)  2-nitroresorcinol                                                    
                   magenta  544      96                                   
(l)  cyanoacetic acid                                                     
                   lemon/   454      74                                   
                   yellow                                                 
(m)  acetyl acetone                                                       
                   orange   486      62                                   
______________________________________                                    
 Coupler (i)                                                              
 ##STR135##                                                               
 
    
     
                       TABLE B                                                     
______________________________________                                    
Dyes formed on mordant (coating A using the                               
quinoxaline sulphonylhydrazide, Structure 11                              
Table 1.                                                                  
Coupler   Hue         λmax (nm)                                    
                                  HBW (nm)                                
______________________________________                                    
Indole    red magenta 542         115                                     
4,5-diphenyl-                                                             
          deep magenta                                                    
                      515         194                                     
imidazole             shoulder 625                                        
Citrazinic                                                                
          deep magenta                                                    
                      557          85                                     
acid                                                                      
______________________________________                                    
 
    
     EXAMPLE 2 
     Metallisable dyes from ballasted couplers 
     A coupler dispersion was made by the following method: 
     
         ______________________________________                                    
Solution A                                                                
Test Coupler   7.0 g                                                      
Coupler solvent.sup.3                                                     
               See Table C                                                
                            heat to 60-100° C.                     
2-butoxyethoxyethyl                                                       
               16.0 g                                                     
acetate                                                                   
Solution B                                                                
121/2% Gelatin 56.6 g                                                     
Di-isopropyl naphthalene                                                  
               9.6 g        heat to 50° C.                         
sulphonate solution*                                                      
______________________________________                                    
 *100 g liter.sup.-1 Alkanol XC, 62.5 cm.sup.3 liter.sup.-1 methanol 3: Th
 coupler solvent and coupler to solvent ratio varied depending on the     
 solubility of the coupler.                                               
 
    
     The solvents were: 
     tri cresyl phosphate--S 1   
     dibutyl phthalate--S 2   
     N,N-diethyl lauramide--S 3   
     Solution A was added slowly to solution B using ultrasonic agitation and the mixture was homogenised for 2 min. The resulting dispersion was cooled, noodle-washed at pH 6.0 for 6 hrs. (4° C.) and made up to 100 g wt. pH 5.0. The final dispersion was 7% coupler and 7% gelatin. 
     Dispersions of the following couplers were made: 
     
                       TABLE C                                                     
______________________________________                                    
Structure (Table II)                                                      
               Coupler:Solvent wt. ratio                                  
______________________________________                                    
1,2            S.sub.1, 1:1                                               
 9-17          S.sub.3, 1:1                                               
18             S.sub.3, 1:2                                               
19-24          S.sub.3, 1:1                                               
26             S.sub.1, 1:1/2                                             
28             S.sub.3, 1:1                                               
______________________________________                                    
 
    
     The couplers were tested in a single layer coating in the following format: 
     
         ______________________________________                                    
Coating B (g/sq. meter)                                                   
______________________________________                                    
gelatin               0.60                                                
Hardener 4            0.06                                                
gelatin               2.0                                                 
cubic AgCl emulsion   (0.3 μm edge)                                    
antifoggant 5         600 mg/mole                                         
Hardener 4            0.02                                                
Coupler               0.001 mole                                          
Antistatic polyethylene terephthalate                                     
______________________________________                                    
 Hardener 4: bis(vinyl sulphonyl methyl)ether                             
 Antifoggant 5: 1(3-acetamido phenyl)5-mercapto-tetrazole (Na salt)       
 
    
     Three fogged strips of the coating were developed in a solution of the sulphonylhydrazide developer (approx. 10 mg developer in 5 cm 3  10% Na 2  CO 3  solution) for 0.5-5 min. (21° C.) The strips were then rinsed in 10% carbonate solution for 0.5 min. to remove retained developer from the coating, washed 2&#39;(30° C.), bleach-fixed 2&#39;(ferric EDTA bleach fix) and washed 2&#39;(30° C.). One strip was then dried and its spectrum taken--this represented the unmetallised form of the dye. The other strips were metallised for 2-5 min. (21° C.) in a nickel or copper metallising bath of the following composition: 
     
         ______________________________________                                    
NiSO.sub.4 7H.sub.2 O or                                                  
                 10          g                                            
CuSO.sub.4 5H.sub.2 O                                                     
water            60          cm.sup.3                                     
0.880 NH.sub.3 solution                                                   
                 20          cm.sup.3                                     
Na.sub.2 CO.sub.3                                                         
                 4.0         g                                            
water            120         cm.sup.3                                     
______________________________________                                    
 
    
     washed 10 min (30° C.) and dried. A 10 min. wash was used to ensure that the Biuret stain formed between the metal and gelatin in the coating was decomposed. The spectrophotometric data on a number of dyes formed with the couplers listed in Table C and three sulphonylhydrazide developers is given in Tables D, E and F. 
     
                                           TABLE D                                 
__________________________________________________________________________
Dyes formed in photographic coating (B) using                             
nitropyridylsulphonylhydrazide - Structure 3,                             
R = CH.sub.3 Table I. Entries under λmax in                        
parentheses indicate the position of a &#34;shoulder&#34;                         
in Tables D-F.                                                            
Coupler                           HBW-                                    
Structure        λmax (nm) Dye +                                   
[Table II]                                                                
      Type       Dye  Dye + Ni                                            
                            Dye + Cu                                      
                                  (nm) Ni                                 
__________________________________________________________________________
 1    Pivaloylacetanilide                                                 
                 --   482   --    --                                      
 2    Cyanoacetamide                                                      
                 461  468   453   --                                      
 9    Malonic ester/Amide                                                 
                 356  455   426    82                                     
10    Sulphonylacetamide                                                  
                 475 (455)                                                
                      462   437    91                                     
11    Malonamide --   464   437    87                                     
12    Sulphamoylacetamide                                                 
                 --   430   --    --                                      
13    Phenol     402 (536)                                                
                      677 (570)                                           
                            --    192                                     
14    p-Cresol   409  583 (417)                                           
                            550, 442                                      
                                  --                                      
15    o-Cresol   426 (563)                                                
                      561   --    --                                      
17    α-Naphthol                                                    
                 451  606   602   150                                     
18    β-Naphthol                                                     
                 600  605 (562)                                           
                            --    --                                      
19    α-Naphthol                                                    
                 497  595   632    96                                     
20    α-Naphthol                                                    
                 569 (603)                                                
                      639   --    --                                      
21    Dihydroxy benzamide                                                 
                 420 (550)                                                
                      554   --    109                                     
22    Dihydroxy benzamide                                                 
                 420, 589                                                 
                      537   537   146                                     
                 (550)                                                    
23    Phenol     --   640   635   --                                      
24    α-Naphthol                                                    
                 465  591   591   101                                     
26    Pyrazolone 477  472   --    107                                     
28    Pyrazolotriazole                                                    
                 458  522   458   187                                     
__________________________________________________________________________
 
    
     
                                           TABLE E                                 
__________________________________________________________________________
Dyes formed in photographic coating (B) using                             
quinoxaline sulphonylhydrazide - Structure 11                             
Table I.                                                                  
Coupler                           HBW                                     
Structure        λmax (nm) Dye + Ni                                
[Table II]                                                                
      Type       Dye  Dye + Ni                                            
                            Dye + Cu                                      
                                  (nm)                                    
__________________________________________________________________________
 1    Pivaloylacetanilide                                                 
                 394  490   --     86                                     
 2    Cyanoacetamide                                                      
                 449  473   474    80                                     
 9    Malonic ester/amide                                                 
                 357  473   465    77                                     
10    Sulphonylacetamide                                                  
                 375  472   467    82                                     
11    Malonamide --   473   465    86                                     
12    Sulphamoylacetamide                                                 
                 --   --    --    --                                      
13    Phenol     430  622, 582                                            
                            --    137                                     
14    p-Cresol   449  565 (600)                                           
                            --    155                                     
15    o-Cresol   454  634   584   136                                     
17    α-Naphthol                                                    
                 578  608   602   104                                     
18    β-Naphthol                                                     
                 499 (615)                                                
                      635 (582)                                           
                            --    126                                     
19    α-Naphthol                                                    
                 523  673   654   107                                     
20    α-Naphthol                                                    
                 620 (580)                                                
                      642, 593                                            
                            --    --                                      
21    Dihydroxy Benzamide                                                 
                 430  548   --    142                                     
22    Dihydroxy Benzamide                                                 
                 440  556 (591)                                           
                            565   157                                     
23    Phenol     --   662   642   --                                      
24    α-Naphthol                                                    
                 563  602   574   107                                     
26    Pyrazolone 475  484   --    106                                     
28    Pyrazolotriazole                                                    
                 496  560   518   --                                      
__________________________________________________________________________
 
    
     
                                           TABLE F                                 
__________________________________________________________________________
Dyes formed in photographic coating (B) using                             
quinazoline sulphonylhydrazide - Structure 10                             
Table I.                                                                  
Coupler                           HBW                                     
Structure        λmax (nm) Dye + Ni                                
[Table II]                                                                
      Type       Dye  Dye + Ni                                            
                            Dye + Cu                                      
                                  (nm)                                    
__________________________________________________________________________
 1    Pivaloylacetanilide                                                 
                 488  388   --    --                                      
 2    Cyanoacetamide                                                      
                 380  448   443    80                                     
 9    Malonic Ester/Amide                                                 
                 365  442   416    76                                     
10    Sulphonylacetamide                                                  
                 373  445   432    80                                     
11    Malonamide --   445   422   --                                      
12    Sulphamoylacetamide                                                 
                 --   425   --    --                                      
13    Phenol     429  540   --    120                                     
14    p-Cresol   442  535   525   134                                     
15    o-Cresol   443  528   530   138                                     
17    α-Naphthol                                                    
                 525  584   590   176                                     
18    β-Naphthol                                                     
                 530, 500                                                 
                      608 (565)                                           
                            --    119                                     
19    α-Naphthol                                                    
                 500  647   627   108                                     
20    α-Naphthol                                                    
                 492  622   576   117                                     
21    Dihydroxy Benzamide                                                 
                 430  520   520   122                                     
22    Dihydroxy Benzamide                                                 
                 427  552   542   130                                     
23    Phenol     530  634   620   155                                     
24    α-Naphthol                                                    
                 515  572   552   113                                     
26    Pyrazolone 452  465   --     98                                     
28    Pyrazolotriazole                                                    
                 482  497   514   102                                     
__________________________________________________________________________
 
    
     EXAMPLE 3 
     Samples of the dye formed between developer 10, Table I and coupler 14, Table II were prepared as outlined in Example 2 but were metallised in the following solutions for 2 minutes and then washed 10 mins. (30° C.) 
     
         ______________________________________                                    
Solution 1 Ni/NH.sub.3                                                    
NiSO.sub.4 7H.sub.2 O   0.025 g                                           
0.880 NH.sub.3          2.32 g                                            
Water                   20 cm.sup.3                                       
Water to 30 cm.sup.3    pH 11.65                                          
Solution 2 Ni/ethanolamine                                                
NiSO.sub.4 7H.sub.2 O   0.025 g                                           
ethanolamine            1.30 g                                            
Water                   20 cm.sup.3                                       
Water to 30 cm.sup.3    pH 11.37                                          
Solution 3 Ni/diethanolamine                                              
NiSO.sub.4 7H.sub.2 O   0.25 g                                            
diethanolamine          2.24 g                                            
Water                   20 cm.sup.3                                       
Water to 30 cm.sup.3    pH 10.55                                          
______________________________________                                    
 
    
     The spectrophotometric curves of the dyes were very similar as indicated in Table G. 
     
                       TABLE G                                                     
______________________________________                                    
Metallisation of dye formed from developer 10,                            
Table I and coupler 14, Table II.                                         
        λmax                                                       
               HBW     Absorbance at                                      
Solution No.                                                              
          nm       nm      425 nm 535 nm                                  
                                        650 nm                            
______________________________________                                    
unmetallised                                                              
          445      130     .91     .26  .06                               
1         534      134     .23    1.00  .13                               
2         530      138     .26    1.00  .12                               
3         536      132     .23    1.00  .10                               
______________________________________                                    
 
    
     Metallisation is also possible at low Ni ++   levels (approx. 0.02%) and with other complexing agents instead of ammonia or an ethanolamine. 
     EXAMPLE 4 
     Two samples of the dye formed between developer 7 Table I and coupler 14 Table II were prepared as outlined in Example 2 but were metallised in the following solutions for 2 min. at 21° C. and washed 2 minutes. 
     
         ______________________________________                                    
Solution A                                                                
NiSO.sub.4 7H.sub.2 O  10     g                                           
Water                  60     cm.sup.3                                    
0.880 NH.sub.3         20     cm.sup.3                                    
Na.sub.2 CO.sub.3      4.0    g                                           
Water to               120    cm.sup.3                                    
Solution B                                                                
NiSO.sub.4 7H.sub.2 O  10     g                                           
Water                  60     cm.sup.3                                    
0.880 NH.sub.3         20     cm.sup.3                                    
CTAB (cetyltrimethyl-  10     g                                           
ammonium bromide)                                                         
Na.sub.2 CO.sub.3      4.0    g                                           
Water to               120    cm.sup.3                                    
______________________________________                                    
 
    
     The presence of the CTAB in the metallising solution resulted in a much sharper absorption curve as indicated in Table H. 
     
                       TABLE H                                                     
______________________________________                                    
Effect of CTAB                                                            
        λmax                                                       
               HBW     Absorbance at                                      
Solution No.                                                              
          nm       nm      425 nm 535 nm                                  
                                        650 nm                            
______________________________________                                    
unmetallised                                                              
          445      130     0.91   0.26  0.06                              
A         535      137     0.26   1.00  0.10                              
B         537      102     0.13   1.00  0.04                              
______________________________________                                    
 
    
     EXAMPLE 5 
     Metallisable dyes from a range of sulphonyl hydrazide developers with common coupler 24 Table II. 
     35 mm strips of coating B containing coupler 24, Table II were exposed to a 0.3 log E increment step wedge. The strips were than developed for 11/2 and 41/2 mins. at 30° C. in a solution of the following composition: 
     
         ______________________________________                                    
Developer                                                                 
______________________________________                                    
Water              833      cm.sup.3                                      
K.sub.2 CO.sub.3 (anhyd)                                                  
                   30       g                                             
NaCl               5        g                                             
Na.sub.2 SO.sub.3  1        g                                             
Benzyl alcohol     10       cm.sup.3                                      
Sulphonyl hydrazide                                                       
                   0.015    M                                             
developer                                                                 
Water to           1000 cm.sup.3, pH 12.7                                 
                   (27° C.) with KOH                               
______________________________________                                    
 
    
     After development the strips were treated as follows: 
     
         ______________________________________                                    
Wash                      30 sec.                                         
Ferric EDTA        2&#39;     (21° C.)                                 
bleach fix                                                                
Wash               3&#39;     (30° C.)                                 
Metallisable Ni/NH.sub.3 *                                                
                   11/2&#39;  (21° C.)                                 
Wash               5&#39;     (30° C.)                                 
______________________________________                                    
 *Solution A, Example 4.                                                  
 
    
     From the resulting step wedge, Dmax/Dmin, and speed parameters were measured and the spectrophotometric curve of the metallised azo dye was also taken. 
     The results are shown in Table J. A fairly wide range of dyes was observed (λmax 536-618 nm) using the naphthol coupler. The dyes would probably be bidentate complexes with nickel. 
     
                                           TABLE J                                 
__________________________________________________________________________
Sensitometry of sulphonylhydrazide developers, pH 12.3;                   
Coupler 24 Table II (dyes metallised Ni/NH.sub.3)                         
Developer                                                                 
Structure   Dye Dmax*                                                     
                   Speed (D = 0.2) HBW                                    
Table I     11/2&#39;/41/2&#39;                                                   
                   11/2&#39;/41/2&#39;                                            
                         11/2&#39;/41/2&#39;                                      
                               λmax                                
                                   nm                                     
__________________________________________________________________________
1           1.19/1.20.sup.(R)                                             
                   201/218                                                
                         .06/.07                                          
                               618 112                                    
6           1.75/1.87.sup.(G)                                             
                   219/230                                                
                         .07/.30                                          
                               553 125                                    
4           0.08/0.60.sup.(R)                                             
                    --/156                                                
                         .03/.03                                          
                               592 112                                    
11          0.80/0.80.sup.(R)                                             
                   179/179                                                
                         .04/.05                                          
                               602 107                                    
 ##STR136## 1.57/1.54.sup.(G)                                             
                   228/243                                                
                         .19/.36                                          
                               598 112                                    
13          1.70/1.78.sup.(G)                                             
                   231/231                                                
                         .13/.48                                          
                               554 113                                    
3, R = CH.sub.3                                                           
            1.94/1.84.sup.(G)                                             
                   222/228                                                
                         .22/.52                                          
                               591 105                                    
 ##STR137## 1.47/1.49.sup.(R)                                             
                   220/238                                                
                         .07/.11                                          
                               594 101                                    
10          1.90/1.96.sup.(G)                                             
                   227/235                                                
                         .10/.14                                          
                               572 113                                    
5            .92/.90.sup.(G)                                              
                   180/188                                                
                         .15/.41                                          
                               536  86                                    
12          1.91/2.05.sup.(R)                                             
                   233/237                                                
                         .26/.29                                          
                               614 146                                    
 ##STR138## 1.62/1.54.sup.(G)                                             
                   238/261                                                
                         .09/.14                                          
                               592 104                                    
 ##STR139## 1.18/1.16.sup.(R)                                             
                   224/240                                                
                         .09/.15                                          
                               600 112                                    
__________________________________________________________________________
 *maximum dye density recorded Status A, R or G                           
 
    
     EXAMPLE 6 
     The metallised dyes shown in Table K were prepared as described in Example 2 and faded in a fading device for 400 hrs. The percentage fade from a density of 1.0 shows that a substantial improvement can be obtained by using metallised azo dyes compared with typical unmetallised azamethine dyes. 
     In the fading device the samples were irradiated from both sides using two Thorn 65/80W north light fluorescent tubes (NL) and two Philips 40W Actinic Blue 05 tubes (UV) arranged so that one of each type of lamp was directed at each side of the sample at a distance of about 6 cm. Each side of the sample was covered with an Ektalux 2B UV filter and the temperature and humidity were controlled to 21° C., 50% RH respectively. 
     The results are recorded in Table K below. 
     
                       TABLE K                                                     
______________________________________                                    
                                      % Fade                              
Coupler                               from                                
Structure                             D = 1.0                             
(Table Developer      Dye       λmax                               
                                      400 hrs                             
II)    Structure      Form      (nm)  (+UV)                               
______________________________________                                    
2      XI             Dye + Ni  448   +3                                  
       R.sup.2 = CH.sub.3,                                                
       R.sup.3 = C.sub.6 H.sub.5                                          
       R.sup.9 = H                                                        
2      X              Dye + Ni  472   0                                   
       R.sup.2 = CH.sub.3, R.sup.9 = H                                    
       R.sup.10 = CH.sub.3                                                
2      X              Dye + Ni  500   +2                                  
       R.sup.2 = CH.sub.3, R.sup.9 = NO.sub.2                             
                                (470)                                     
       R.sup.10 = CH.sub.3                                                
1      4-Nethyl-      Dye       442   -15                                 
       N(β-methane-                                                  
       sulphonamidoethyl)                                                 
       amino-o-toluidine                                                  
       sesquisulphate (CD3)                                               
24     IX             Dye + Ni  526   -6                                  
       R.sup.9 = H                                                        
22     XI             Dye + Ni  537   -1                                  
        ##STR140##                                                        
       R.sup.9 = HR.sup.3 = CF.sub.3                                      
15     XI             Dye + Ni  510   0                                   
        ##STR141##                                                        
       R.sup.9 = H, R.sup.3 = CF.sub.3                                    
26     CD3            Dye       538   -6                                  
13     X              Dye + Ni  622   +1                                  
       R.sup.2 = CH.sub.3, R.sup.9 = H                                    
                                (580)                                     
       R.sup.10 = CH.sub.3                                                
19     XI             Dye + Ni  630   +1                                  
        ##STR142##                                                        
       R.sup.9 = H, R.sup.3 = CF.sub.3                                    
19     X              Dye + Ni  679   +2                                  
       R.sup.2 = CH.sub.3, R.sup.9 = NO.sub.2                             
                                (627)                                     
       R.sup.10 = CH.sub.3                                                
31     CD3            Dye       640   -1                                  
______________________________________                                    
 
    
     EXAMPLE 7 
     Three strips of multilayer coating B were exposed to a four colour step wedge (neutral R, G and B exposures) and processed in the following manner: 
     (a) Develop. 21/2 min. at 30° C. 
     (b) Water rinse 2 sec. 
     (c) Stop Bath 30 sec. 
     (d) Water rinse 2 sec. 
     (e) Ferric EDTA bleach fix, 2 min. at 21° C. 
     (f) Wash 5 min. 30° C. 
     (g) Metallise (Ni) -- solution A, 2 min at 21° C. 
     (h) Wash 10 min 30° C. 
     The developer solution was varied: 
     
         ______________________________________                                    
Developer 1                                                               
______________________________________                                    
Water             800         ml                                          
K.sub.2 CO.sub.3  30          g                                           
NaBr              1.0         g                                           
NaCl              5.0         g                                           
Na.sub.2 SO.sub.3 0.20        g                                           
Benzyl alcohol    12.50       g                                           
Antifoggant 6     0.012       g                                           
Sulphonyl hydrazide,                                                      
                  2.50        g                                           
structure 10 Table 1                                                      
Water to 1 liter pH,                                                      
                  11.6                                                    
Antifoggant 6:                                                            
4-carboxymethyl-4-thiazoline-2-thione                                     
______________________________________                                    
 
    
     Developer 2 
     Developer 1+2.0 g/liter bis-pyridinium methyl ether perchlorate. 
     Developer 3 
     Developer 1+0.20 g/liter, 4-hydroxymethyl-4-methyl-1-phenyl-pyrazolidin-3-one. 
     
         ______________________________________                                    
Coating B (g/sq. meter)                                                   
______________________________________                                    
Gel               1.03                                                    
Hardener 4        0.011                                                   
Gel               2.05                                                    
AgCl/Br (0.27μ)                                                        
                  0.26                                                    
Coupler C (S.sub.3, 1:1)                                                  
                  0.30                                                    
Hardener 4        0.015                                                   
Gel               1.3                                                     
Tinuvin 328       0.71                                                    
Scavenger 6 (S.sub.2, 1:3)                                                
                  0.60                                                    
Hardener 4        0.013                                                   
Gel               1.3                                                     
AgCl/Br (0.27μ)                                                        
                  0.40                                                    
Coupler B (S.sub.3, 1:1)                                                  
Hardener 4        0.014                                                   
Gel               0.9                                                     
Scavenger 6 (S.sub.2, 1:3)                                                
                  0.60                                                    
Hardener 4        0.008                                                   
Gel               2.014                                                   
AgCl/Br (0.75μ)                                                        
                  0.50                                                    
Coupler A (S.sub.1, 1:1)                                                  
                  1.08                                                    
Hardener 4        0.015                                                   
______________________________________                                    
 R.C. PAPER BASE                                                          
 Scavenger 6: dioctyl hydroquinone                                        
 Coupler A: Table II Structure 1                                          
 Coupler B: Table II Structure 14                                         
 Coupler C: Table II Structure 19                                         
 
    
     The stop bath (c) had the following composition: 
     
         ______________________________________                                    
Water             800         ml                                          
K.sub.2 CO.sub.3  30          g                                           
NaBr              1.2         g                                           
5-methylbenzotriazole                                                     
                  0.40        g                                           
Na.sub.2 SO.sub.3 4.0         g                                           
Water to 1 liter  (pH 11.3)                                               
______________________________________                                    
 
    
     The processed sample using developer 1 showed only a weak cyan image. Both developers 2 and 3 showed strong cyan, magenta and yellow images. The sensitometric data is shown in Table L. 
     
                       TABLE L                                                     
______________________________________                                    
           Speed                                                          
           (neutral                                                       
           at D = 0.7)                                                    
                    Dmax       Dmin                                       
Coating                                                                   
       Process   R  G  B     R  G  B R   G   B                            
______________________________________                                    
Coating                                                                   
       Developer -- -- --    .50 --  --                                   
                                     .28 .24 .27                          
B      1                                                                  
Coating                                                                   
       Developer 132 155 197                                              
                            2.29 2.54 2.33                                
                                     .17 .16 .29                          
B      2                                                                  
Coating                                                                   
       Developer 183 178 197                                              
                            2.43 2.49 2.27                                
                                     .16 .16 .21                          
B      3                                                                  
Control                                                                   
       See below 194 190 190                                              
                            2.36 2.34 2.52                                
                                     .11 .11 .11                          
______________________________________                                    
 
    
     The sulphonyl hydrazide developers can be used to process a full colour multilayer at low pH (11.6). The addition of a development accelerator or ETA is not as necessary at higher pH levels. 
     The Control Coating was like Coating B except that the Coupler B and C were replaced by Couplers of Structure Table II Structure 26 and Table II Structure 31 respectively. The control coating was processed in the C41 process described in the British Journal of Photography Annual 1977 pp. 204-5 (using a p-phenylenediamine colour developer and no metallising step).