Patent Publication Number: US-3876664-A

Title: Anthraquinone sulphonium compounds

Description:
United States Patent [191 Bosshard et al.  
 [ Apr. 8, 1975 ANTHRAQUINONE SULPHONlUM COMPOUNDS [75] lnventors: Hans Bosshard, Basel, Switzerland;  
 Michael Diamantoglou, Erlenbach. Germany; Hans Peter Koellik&#39;er, Muenchenstein; Urs Karlen, Magden, both of Switzerland [73] Assignee: Ciba-Geigy AG, Basel, Switzerland [22] Filed: Dec. 28, 1973 [21] Appl. No.: 429,298  
 Related US. Application Data [62] Division of Ser. No. l60.206, July 6. l97l. Pat. No.  
 [30] Foreign Application Priority Data Primary E.\&#39;aminerHcnry R. .liles Asxismnl E.\&#39;amin0rC. M. S. .laisle Alwrney. Agent, or FirmWenderoth Lind &amp; Ponack [57] ABSTRACT Anthraquinone sulphonium compounds of the formula wherein W denotes the charge equivalent of an inorganic anion are useful in the preparation of anthraquinone dyestuffs of the formula in which R and R independently of one another each denote hydrogen or a lower alkyl group, X denotes a direct bond, Ch O or -S--, and Y denotes the nitrile group, a thiocarboxylic acid ester group a carbacyl group, or an optionally substituted aliphatic, cycloaliphatic, carbocyclicaromatic or heterocyclic radical.  
 The dyestuffs yield fast blue shades on polyester fibers.  
 Claims, No Drawings 1 ANTHRAQUINONE SULPHONIUM COMPOUNDS R NE on no 0 arr- R in which R, and R independently of one another each denote hydrogen or a lower alkyl group, X denotes a direct bond CH O or S, and Y denotes the nitrile group. a thiocarboxylic acid ester group. a carbacyl group or an optionally substituted aliphatic, cycloaliphatic. carbocyclie-aromatic or heterocyclic radical.  
  The description groups which dissociate in water to give an acid reaction and confer solubility in water.&#34; which are excluded from the new dyestuffs. used here and in the subsequent text for the known substituents which impart anionic character to the dyestuffs, for example sulphonic acid, carboxylic acid and phosphoric acid groups.  
  If R, and R denote a lower alkyl group. then this is, for example, the methyl, ethyl. iso-propyl or sec. butyl group; preferably, R and R represent hydrogen.  
 X is preferably a direct bond or oxygen.  
  If Y represents a thiocarboxylic acid ester group, then this is, for example, the thiocarboxylic acid 0- phenyl ester group, or preferably a thiocarboxylic acid O-lower alkyl ester group. such as the thiocarboxylic acid O-methyl ester, thiocarboxylic acid O-ethyl ester, thiocarboxylic acid O-isopropyl ester or thiocarboxylic acid O-butyl ester group.  
  If Y denotes a carbacyl radical, it represents. in particular, a lower unsubstituted or non-ionically substituted alkanoyl group, of which the alkanoyl unit advantageously possesses 2 to 4 carbon atoms. As non-ionic substituents. the alkanoyl group can for example conpecially the alkyl groups, can, for example, contain hal- 6 ogens, such as chlorine or bromine, a hydroxyl. nitrile, lower alkoxy. lower alkoxycarbonyl lower alkoxyalkoxycarbonyl or di-lower alkylamino group, and also a carbocyclic ring, such as the cyclohexyl radical, or especially an aromatic ring, such as the phenyl or phenoxy radical, or a heterocyclic ring, such as the thienyl-(2 furyl-(Z) or tetrahydrofuryl-(Z) radical.  
  If Y represents a cycloaliphati&#39;c radical, cycloalkyl groups with, preferably, 5-membered or 6-membered rings can. for example, be used, and especially the cyclohexyl group.  
  If Y denotes a carbocyclic-aromatic radical. this radical preferably belongs to the benzene series; it can contain customary non-ionic ring substituents. Nitro groups, lower alkoxy groups, lower alkyl groups. lower alkoxycarbonyl groups or halogens, such as flourine. chlorine or bromine, may be mentioned as examples of such substituents.  
  If Y denotes a heterocyclic radical. this radical can be either of aromatic or non-aromatic character; aromattic-heterocyclic radicals are preferably 5- membered or 6-membered and can possess a single hetero-atom or several identical or different heteroatoms; they can also be condensed. for example with a benzene radical, such as, for example. the triazolyl. te trazolyl, 2- or 4-pyridyl, Z-quinolinyl. Z-pyrimidyl, 1,3,4-triazinyl, Z-benzoxazolyl, or Z-benzthiazolyl radical, which can possess customary non-ionic ring substituents. Amongst the non-aromatic heterocyclic radicals. S-membered or 6-membered radicals are again preferred; the Z-thiazolinyl. the Z-imidazolinyl and the 2(6-methyl-penthiazolinyl) radicals may be mentioned.  
  In preferred anthraquinone dyestuffs of the formula I, Y denotes the nitrile group, a lower alkyl group substituted by a lower alkoxycarbonyl group. a thiocarboxylic acid lower alkyl ester group or a phenyl radical which is optionally substituted by halogen or by a lower alkyl group.  
  In the preceding text, the term lower in the context of alkyl or alkoxy groups denotes radicals of this nature which have not more than 5 carbon atoms.  
  The new anthraquinone dyestuffs of the formula I are obtained by oxidizing an anthraquinone compound of the formula I in which R and R have the meaning indicated under formula I, to the corresponding quinone-imine compound, adding to this, in a strongly acid medium, :1 cyclic sulphide of the formula III -s CH2 CH.2\ X \CH2 015 (III) 5 in which X has the meaning indicated under formula I.  
 and reacting the resulting sulphonium compound of the formula IV in which R R and X have the meaning indicated under formula I and W denotes the charge equivalent of an inorganic anion. in the presence of a proton acceptor, with a mercapto compound of the formula V HS Y Y) in which Y has the meaning indicated under formula I, to give an anthraquinone dyestuff of the formula I, the starting substances being so chosen that the final dyestuff does not possess any groups which dissociate in water to give an acid reaction and confer solubility in water.  
  Suitable l.5-dihydroxy-4,8-diamino-anthraquinones of the formula I] for carrying out this process are. for example, l,5-dihydroxy-4,8-diamino-anthraquinone, l,5-dihydroxy-4,8-bismethylamino-anthraquinone, l 5-dihydroxy-4,8-bisethylamino-anthraquinone and 1.5- dihydroxy-4,8-bis-isopropylamino-anthraquinone.  
  Examples of cyclic sulphides which can be used as starting substances are: tetrahydrothiophene, tetrahydrothiapyrane. l,4-dithiane and l,4-oxathiane (thioxane).  
  The oxidation of l,5-dihydroxy-4,8-diaminoanthraquinone compounds of the formula II to give the corresponding quinone-imines capable of addition takes place according to methods which are in themselves known, in acid solution or suspension, for example in 60 to 100% strength sulphuric acid, using oxidising agents. such as manganese dioxide, lead dioxide, chromic acid, nitric acid, lead tetraacetate or potassium persulphate, at temperatures of to 30C.  
  The reaction of the quinone-imines of l,4-dihydroxy- 5,8-diamino-anthraquinones of the formula ll with the sulphide compounds of the formula III to give the sulphonium salts of the formula IV is appropriately carried out in a strongly acid medium at temperatures of to C, and sulphuric acid, pyrosulphuric acid, phosphoric acid, polyphosphoric acid or hydrofluoric acid can be used as acids.  
  Preferably, aqueous sulphuric acid, especially 60 to 85% strength aqueous sulphuric acid, is used as the strongly acid medium.  
  Equivalent quantities of the starting substances, or a 5 to 10% excess of cyclic sulphide, are used for the reaction. The acid is appropriately present in excess. since it simultaneously serves as the solvent.  
  The sulphonium compounds produced in this reaction precipitate directly as sulphates or phosphates on diluting the acid solution, for example containing sulphuric acid or phosphoric acid, with ice water, and can be isolated by filtration.  
  As examples of mercapto compounds of the formula V which can be used according to the invention there may be mentioned, inter alia: methylmercaptan, ethylmercaptan, propylmercaptan, isopropylmercaptan, octylmercaptan, dodecylmercaptan, B-hydroxyethylmercaptan, &#39;y-hydroxypropylmercaptan, B-methoxyethylmercaptan, B-ethoxyethylmercaptan, &#39;y-methoxy- 4 propylmercaptan, &#39;y-ethoxypropylmercaptan, benzylmercaptan, B-phenylethylmercaptan, &#39;y-phenylpropylmercaptan, 8-phenylbutylmercaptan, B-phenoxyethylmercaptan, y-phenoxy-propylmercaptan, B-propionylethylmercaptan, cyclohexylmercaptan, thioglycollic acid methyl ester, thioglycollic acid ethyl ester, thioglycollic acid isopropyl ester, thioglycollic acid cyclohexyl ester, thiophenol, p-thiocresol, 2,5-dimethylthiophenol, 2,6-dimethylthiophenol, 2,4,6-trimethylthiophenol, 2-ethylthiophenol, 4-isopropylthiophenol, 4-n-butylthiophenol, 4-tert.-butylthiophenol, 4-trifluoromethylthiophenol, 2-chloro-4- propylthiophenol, 4-methoxythiophenol, 3-bromo-4-butoxythiophenol, 4-nonylthiophenol, 4- dodecylthiophenol, 4-chloro-thiophenol, 4- bromothiophenol, 3,4- or 3,5-dichlorothi0phenol, 4- fluorothiophenol, 4-phenoxythiophenol, 4- phenylthiophenol, 3-ethoxycarbonylthiophenol, 3-butoxycarbonylthiophenol, 4-( B-methoxyethyl thiophenol, 4-(B-isopropoxybutyl)-thiophenol, 4-butoxymethylthiophenol, 4-( B-hydroxyethyl thiophenol, 4-(B-hydroxyethoxy)-thiophenol, 3-nitrothiophenol, 4-ethoxycarbonyl-methylthiophenol, 2- mercaptopyridine, 4-mercaptopyridine, 2-methyl-4- mercaptopyridine, 6 mercaptoquinoline. 8-  
 mercaptoquinoline, Z-mercaptopyrimidine, Z-mercapto-thiazolidine, Z-mercaptobenzthiazole, Z-mercaptobenzoxazole and S-mercapto-l-phenyltriazole. as well as potassium thiocyanate and potassium xanthate.  
  Possible proton acceptors are, for example: alkali metal and alkaline earth metal oxides and hydroxides, such as sodium hydroxide, potassium hydroxide. calcium hydroxide, magnesium oxide or barium oxide: alkali metal salts of weak organic and inorganic acids. such as sodium acetate, potassium acetate, sodium benzoate, sodium salicylate, potassium hydrogen carbonate, potassium carbonate, sodium carbonate, sodium borate, disodium phosphate or trisodium phosphate; tertiary aliphatic or cycloaliphatic amines, such as triethylamine or quinuclidi&#39;ne; heterocyclic tertiary nitrogen bases, such as pyridine and quinoline bases or their mixtures, such as pyridine, 01-, ,8- or y-methylpyridine, lutidine, collidine, 2-methyl-5-ethylpyridine, quinoline, quinaldine, lepidine or isoquinoline; or N,N- dialkylaminobenzenes, such as N,N-dimethylor N,N-  
 diethylaminobenzene. Preferred proton acceptors are 1 sodium carbonate or potassium hydrogen carbonate.  
  The reaction of the sulphonium compounds of the formula IV with the mercapto compound of the formula V takes place with splitting of the sulphonium ring, advantageously by introducing the mercapto compound into an aqueous suspension of the sulphonium compound, which also contains the proton acceptor, and thereafter warming the reaction mixture at temperatures of 20 to C, preferably 40 to 60C. Relative to the sulphonium compound, the mercapto compound should be present in at least cquimolar amount and the proton acceptor in at least twice the equimolar amount, but preferably an excess of both of these components is used.  
  After completion of the reaction, the dyestuff of the formula I which is formed is filtered from the settledout suspension, washed and dried.  
  The new anthraquinone dyestuffs of the formula 1 are deeply coloured crystalline substances which are sparingly soluble in water. They can be obtained in an analytically pure form by recrystallisation from organic solvents, but such a purification is in general not necessary for their use for dyeing.  
  They are suitable for dyeing or printing synthetic organic fibre material. for example for dyeing fibre material which consists of linear high molecular esters of aromatic polycarboxylic acids with polyhydric alcohols. such as polyethylene glycol terephthalate or poly- (l,4)-cyclohexanedimethylol terephthalate. and for dyeing fibre material of cellulose diacetate. cellulose ZVz-acetate or cellulose triacetate, These dyestuffs can however also be used for dyeing synthetic polyamide fibres. such as, for example. polyhexamethylene adipamide, polycaprolactam or poly-aminoundecanoic acid. and for dyeing polyolefines. especially polypropylene fibres. Furthermore, depending on the composition. they are suitable for bulk dyeing or pigmenting of lacquers, oils and waxes. as well as cellulose derivatives, especially cellulose esters. such as cellulose acetate. or polyamides.  
  The dyeing of the said fibre materials with the sparingly water-soluble anthraquinone dyestuffs according to the invention preferably takes place from aqueous dispersion. It is therefore advisable to finely divide the end substances of formula I which can be used as dispersion dyestuffs. by grinding them with dispersing agents and possibly further grinding auxiliaries.  
  Suitable organic dispersing agents for the purpose are, for example, the alkylarylsulphonates. the condensation products of formaldehyde with naphthalenesulphonic acid. and the ligninsulphonates; suitable nonionic dispersing agents for the purpose are. for example. fatty alcoholor alkylphenyl-polyglycol-ethers with a higher alkyl radical.  
  The dyeing of the polyester fibres with the sparingly water-soluble dyestuffs according to the invention from aqueous dispersion takes place in accordance with the processes which are customary for polyester materials. Polyesters of aromatic polycarboxylic acids with polyhydric alcohols are preferably dyed at temperatures above 100C, under pressure. Dyeing can, however, also be carried out at the boiling point of the dye bath in the presence of dyestuff carriers. for example phenylphenols, polychlorobenzene compounds. or similar auxiliaries, or according to the thermosol process, that is to say padding with a subsequent hot after-treatment, for example thermofixing. at l802lOC. Cellulose l /z-acetate fibres are preferably dyed at temperatures of 8085C. whilst cellulose triacetate fibres are advantageously dyed at the boiling point of the dye bath. When dyeing cellulose ZVz-acetate or polyamide fibres, the use of dyestuff carriers is superfluous. Anthraquinone dyestuffs according to the invention can also be used for printing the said materials according to customary methods.  
  The anthraquinone dyestuffs of the formula I which can be used as dispersion dyestuffs have very good affinity for the abovementioned synthetic organic fibre material. especially for polyethylene glycol terephthalate fibres. and give strong blue dyeings thereof, which are fast to light, washing, rubbing, perspiration. sublimation, solvents and decatising. Mixtures of anthraquinone dyestuffs according to the invention also behave very advantageously in this respect.  
  Furthermore, anthraquinone dyestuffs according to the invention can also be employed very successfully in mixtures with other dispersion dyestuffs which are fast to sublimation, for dyeing textile material by the padding-thermofixing process. The fact that dyestuffs of the formula I. on dyeing tightly constructed polyester fabrics or tightly twisted polyester yarns give uniform dyeings throughout is also particularly noteworthy. Furthermore. the new dyestuffs ofthe formula I possess the valuable property of making it possible to obtain very deep. non-Streaky dyeings on texturised polyester fibres. for example Crimplene, and these dyeings furthermore possess good fastness, particularly fastness to rubbing and sublimation. The new anthraquinone dyestuffs also show very good stability in the liquor and in their stability to boiling-down.  
 The examples which follow illustrate the invention.  
 EXAMPLE I 28.6 g of l,5-dihydroxy-4,S-diamino-anthraquinone are dissolved in 270 ml of 96% strength sulphuric acid at 30C. The resulting solution is cooled to 0-5C and is treated with 18 g of manganese dioxide added in portions over the course of minutes. The deep blue solution of the quinone-imine formed is then filtered and the residue is washed with 180 ml of 96% strength sulphuric acid. The solution is thereafter diluted with water at 10C to 60-70% sulphuric acid content. Thereafter l0 g of tetrahydrothiophene are added dropwise to the solution over the course of 20 minutes. at O-5C. After minutes. the reaction is practically complete. The resulting yellow solution is subsequently mixed with 1 litre of water at 15C, whereupon the sulphonium compound of the formula I EH OK m &#39;0 on I on 0 m is filtered off, washed with water and methanol and dried in vacuo at 50-60C.  
  After grinding with ligninsulphonate, this dyestuff dyes fibres of cellulose diacetate and cellulose triacetate, and especially of polyethylene glycol terephthalate, in pure blue shades from aqueous dispersion. The  
 dyeings have good fastness to sublimation and to rubbing. I  
 lf instead of 28.6 g of l.5-dihydroxy-4.8-  
 diaminoanthraquinone equivalent amounts of one of the anthraquinone compounds indicated in the follow-, ing Table 1, column [L are used. and instead of the l5.9 g of thioglycollic acid methyl ester. equivalent amount of one of the mercapto compounds indicated in column 111 of the same table are used and in other respects the same procedure as indicated in the example is followed; the corresponding final dyestuffs listed in column IV are obtained. which dye polyethylene glycol terephthalate fibres in blue colour shades having similar properties.  
 TABLE 1 I II III Iv Example Anthraquinone compound Mercapto compound Dyestuif of the formula R -NH 0 0H R -NH 0 0a L S (CHZ)4 S Y I a I t I r H LII-R2 H iii-R R R2 R1 n 1 2 H H HS-CH2C00-OH3 a H -CH2COO-&#39;CH3 3 a H &#39;HS-CH C0OC I-l a H -CH2COOC2H5 4 H a Hs-c1r cooc rr H y n v -CH2CO0C4H9 5 H H its-011 42090 11 3 H a r-cii cooc g 6&#39; H H ns-cit ea -on n a -CH2CH2-OH 7 H a its-0H H H -cn a a H -Hs H H G 9 n H .ns 0H3 H a @3 11 H 1rsc(cn H H C(CH -i 11 KS-CN H H -OH 12 KS-- CSOC2H5 -CSOC2H5- I N-&#39;-CH l i I] IE2 2 i 13 H H J; H H -0 .c&#39;  
 14 H H. HS-fi H H N CH l5 CH5 its-Q CH3 CH3 l6 CH3 (m H$-CH2C0OCH3 cs CH3 17 n CH3 Q CH3 CH3 Q 18 CH3 0x -0W3 cs CH3 @003 EXAMPLE [9 28.6 g of l.5-dihydroxy-4,8-diaminoanthraquinone are oxidized with 18 g of manganese dioxide as indicated in Example 1, after which the deep blue solution of the quinoneimine formed is diluted with water to 60-70% sulphuric acid content. 1 1.5 g of l.4-oxathiane are added dropwise. at 05C to the diluted solution. After one hour the solution. which has changed to yellow, is diluted with 1 litre of water at 15.  
 The sulphonium compound of the formula H3 0 OH I&#34; HO OIIlH separates out in a crystalline form. It is filtered off and washed with ice water.  
  The moist sulphonium compound is thereafter suspended in 1 litre of water. and the suspension is adjusted to pH 7-8 with 10% strength sodium carbonate The dyestuff which has separated out. of the formula NH 0 OH I S CH CH OClI Cfl SQ I I HO N11 is filtered off. washed with water and methanol and dried in vacuum at 50 60C.  
  The dyestuff obtained is a blue powder. which after grinding with a dispersing agent dyes cellulose diacetate and cellulose triacetate fibres and especially polyethylene glycol terephthalate fibres in clear blue shades from aqueous dispersion. The dyeings have good fastness to sublimation and to rubbing.  
  if instead of 28.6 g of l.5-dihydrox \&#39;--l.8- diaminoanthraquinone equivalent amounts of one of the anthraquinone compounds indicated in the following Table 2. column ll are used. and instead of the 22 g of thiophenol equivalent amounts of one of the mercapto compounds indicated in column [ll of the same table are used. and in other respects the same procedure as indicated in the example is followed. the corresponding dyestuffs listed in column I\ are obtained. which dye polyethylene glycol terephthalate fibres in blue colour shades having similar properties.  
 TABLE I II III IV Example Anthraquinone Mercapto compound v Dyestuff of the formula No. compound Il -NH O OH R -YH OH A H I C2H40C2 -S-i F0 0 NH R H NH-R t 2 R: R R R Y 20 H H HS-- JH CH H H --GH OH I 21 H H L5 :1 (3 H H H n C H 22 H H HSn-C H H H -n--C H 22 H H HS-n-C H H H -n--C H 24 H H HS-n-C H H H -n--C H 25 H H HS-CH CH OH H H -CH CH OH 26 I H HS-CH C6OCH H H -CH COOCH 27 H g H HSCH COOC H H -CH COOC H 28 H H HS-CH COOC H H H -(.,H .&#39;IOOC H 2 H T-T v 9 :1 HS CH COOC OOH H H CMQCOOCQH4OCI13 Continuation of Table 2 I II III IV Example R R Mercapto compound R R Y 52 CH H KS-CN CH H -CN 55 CH H CS-COCK; CH H COCH 34 (1 H H KS-CN C H H CN L? C H H KS-CSOC H C H H --C SOC H q /b C H H KS CH CQOCH C H H CH COOCH m Ir a .7 H H HS- 1 a H -c \N O O :2 ,crt H n5-C j H H -C. H I  
 EXAMPLE 59 4050C for one hour. The dyestuff which has sepa- 28.6 g of l,5-dihydroxy-4.8-diamino-anthraquinone rated out. of the formula are oxidized with 18 g of manganese dioxide as indi- 35 2 0 OH 4 cated in Example 1. The deep blue solution of the qui- Z 4 2 none-lmlne obtained is diluted with water to 60-70% sulphuric acid content and treated with 13.3 2 of 1,4-  
  l l dithiane. After one hour, 1 litre of water poured into 0 NH a HO 2 the solution at 15 C, whereupon the sulphomum compound of the formula is filtered oft. washed with water and methanol and dried in vacuo.  
  The resulting dyestuff is a blue powder which after NH 0H grinding with a dispersing agent dyes cellulose diace- 2 t tate and cellulose triacetate fibres and especially poly- S RSO ethylene glycol terephthalate fibres in clear blue shades j 4 from aqueous dispersion. The dyeings have good fastness to sublimation and rubbing. Ho 0 NH 40 if instead of 28.6 g of l,5-dihydroxy-4,8-  
  2 diaminoanthraquinone equivalent amounts of one of the anthraquinone compounds indicated in the following Table 2, column I] are used, and instead of the 19.4 g of potassium thiocyanate in equivalent amounts of precipitates in a crystalline form. It is filtered off and one of the mercapto compounds indicated in column washed with ice water. ll] of the same table are used, and in other respects the The sulphonium compound, whilst still moist, is sussame procedure as indicated in the example is folpended in 1 litre of ice water, and the suspension is adlowed, the corresponding dyestuffs listed in column IV justed to pH 7-8 with 10% strength sodium carbonate are obtained, which dye polyethylene glycol teresolution and treated with 19.4 g of potassium thiocyaphthalate fibres in blue colour shades having similar nate. Thereafter, the reaction mixture is warmed to properties.  
 Table 3 I II III rv Example Anthraquinone Dyestuff of the formula No. compound 1 0 OH R NH O H l Mercapto compound S-G H -S-O H -S Y HO 0 NH-R HO o NIL-R R R R R Y KS-CS0G H --CSOC H 61 H HS-COCH; -COCl-l 62 HSCH COOC &#39;H H H -CH COOC H 28.6 g of l,5-dihydroxy-4,8-diamino-anthraquinone i phonium compound of the formula l cn -ca precipitates. It is filtered off and washed with ice water.  
  The moist sulphonium compound is suspended in 1 litre of ice water, and the suspension is adjusted to pH 7-8 with strength sodium carbonate solution and Table 3 (continuation) I II III IV Example Anthraquinone Dyestuff of the Formula 2J0. Compound El -Mi 0 OH RFNH OH Mercapto Compound S--C H -SC H S-Y no o &#34;&#39;H-R I HO 0 Nit-R, 2 R R R R Y 3 H H BS-CH2CH2OH H H -CH2CH2OH 64 a H ESQ H H *1) /s 55 H H 4 -0 H H --0 N \N/ 56 CH CH KSC S0C H CH CH e-CSOC H 6 CH CH HS-CH COOC H CH CH -CH COOC E l 5 i 8 C11 CH its-Q CH c11 EXAMPLE 69 is mixed with 19.4 g of potassium thiocyanate. Thereafter the reaction mixture is warmed to 40- 50C for one hour. The dyestuff of the formula l HO UB which has separated out is filtered off, washed with water and methanol and dried in vacuo.  
  If instead of 19.4 g of potassium thiocyanate equivalent amounts of one of the mercapto compounds indicated in the following Table 4, column II, are used, and in other respects the same procedure as indicated in the example is followed. the corresponding dyestuffs listed in column III are obtained, which dye polyethylene glycol terephthalate fibres in blue colour shades having similar properties.  
 TABLE 4 I II III Example Mercapto Compound Dyestuff of the Formula S-(CH -S-Y 70 KS--CSC H ---CSOC H 7.1 HSCH COOCH -CH C0OCH 7 HS&#39; CH 73 Its-01 1 011 -CH CPL l 7 74 Hs-cH ca H CH CH CH 75 KS- CSOOH CSOCH.  
 7e KS-SCSOC ll -scsoo 11 EXAMPLE 77 g of oIeyl-polyglycol-ether. in a pressure dyeing appara- 2&#39; g of the dyestuff obtained according to Example 27 are dispersed in 4.000 g of water. 12 g of the sodium salt of o-phenylphenol. as a swelling agent. and 12 g of diammonium phosphate are added to this dispersion. and 100 g of polyethylene glycol terephthalate yarn are dyed for 1 /2 hours at 9598C. The dyeing is rinsed and aftertreated with aqueous sodium hydroxide solution and a dispersing agent.  
  An intensely coloured blue dyeing which is fast to light and to sublimation is thus obtained.  
  If. in the above example. the 100 g of polyethylene glycol terephthalate yarn are replaced by 100 g of cellulose triacetate fabric. dyeing is carried out under the conditions indicated. and the fabric is subsequently rinsed with water. an intensely coloured blue dyeing of very good fastness to washing and sublimation is obtained.  
 EXAMPLE 78 2 g of the dyestuff obtained according to Example 34 are finely suspended in 2.000 g of water. containing 4 tus. The pH-value of the dyebath is adjusted to 4-5 with acetic acid.  
  g of polyethylene glycolterephthalate fabric are now introduced at 50C the bath is heated to l40C over the course of 30 minutes. and dyeing is carried out for 50 minutes at this temperature. The dyeing is subsequently rinsed with water. soaped and dried. if these conditions are observed. an intensely coloured. level blue dyeing which is fast to perspiration. light and sublimation is obtained.  
  The dyestuffs described in the other examples give dyeings of equivalent quality by this process.  
 EXAMPLE 79 Polyethylene glycol terephthalate fabric is impregnated on a padder. at 40C. with a liquor of the following composition:  
 20 g of the dyestuff obtained according to Example 19,  
 finely dispersed in 7.5 g of sodium alginate.  
 20 g of triethanolamine,  
 20 g of octylphenol-polyglycol-ether and 900 g of water.  
  4. A compound according to claim 1, said compound being of the formula The fabric is squeezed out to approx. 100%. dried at 100C. and subsequently fixed over the course of 30 seconds at a temperature of 210C. The dyed goods are rinsed with water. soaped and dried. Under these conditions. an intensely coloured blue dyeing which is fast to rubbing. light and sublimation is obtained.  
  The dyestuffs described in the other examples give dyeings of equivalent quality by this process.  
  What is claimed is: l. A compound of the formula R NH 0 ca CH2\ wherein R, and R each. independently of the other,  
 represents hydrogen or lower alkyl.  
 X represents a direct bond. -CH- -O,- or  
 S, and  
 W is the charge equivalent of an inorganic anion.  
 2. A compound according to claim 1 of the formula 3. A compound according to claim 1, said compound being of the formula W vo 0H I Hso I Ky I on a  5. A compound according to claim 1, said compound being of the formula NH 0 OH HOON&#39;H 6. A compound according to claim 1, said compound being of the formula