PROCESS FOR THE PREPARATION OF 3-ARYL-BENZOFURANONES

Abstract: Process for the preparation of compounds of formula (I), wherein the general symbols are as defined in claim 1, which process comprises reacting a compound of formula (V), wherein the general symbols are as defined in claim 1, with carbon monoxide in the presence of a catalyst.

Description: Process for the preparation of 3-aryl-benzofuranones The present invention relates to a novel process for the preparation of 3-aryl-benzofuranones, which are suitable for stabilising organic materials against oxidative, thermal or light- induced degradation. The best processes hitherto for the preparation of 3-aryl-benzofuranones are described, for example, in U.S. 4 325 863 and U.S. 5 607 624. The process disclosed in U.S. 4 325 863 (Example 1 , column 8, lines 35-45) for the preparation of 3-phenyl-3H-benzofuran-2-ones, for example 5,7-di-tert-butyl-3-phenyl-3H-benzo- furan-2-one of formula C, comprises reacting the 2,4-di-tert-butylphenol of formula A with the mandelic acid of formula B, with removal of water. (A) (B) (C) A disadvantage of that process is that it requires the use of mandelic acids substituted on the phenyl ring or heterocyclic mandelic acids. Not very many of those mandelic acids are known from the literature, however, and the known synthesis procedures for the preparation thereof are relatively complicated. The process disclosed in U.S. 5 607 624 (Example 1 , column 24) for the preparation of 3-phenyl-3H-benzofuran-2-ones substituted on the 3-phenyl ring, for example 5,7-di-tert- butyl-3-(2,5-dimethyl-phenyl)-3H-benzofuran-2-one of formula F, comprises reacting the 5,7- di-tert-butyl-3-hydroxy-3H-benzofuran-2-one of formula D with p-xylene of formula E, with removal of water. A disadvantage of that process is that, for the preparation of unsubstituted 3-phenyl-benzo- furanone derivatives, it requires the use of benzene, which is carcinogenic, instead of p-xylene. There is therefore still a need to find an efficient process for the preparation of 3-aryl- benzofuranones that does not have the disadvantages mentioned above. The present invention therefore relates to a process for the preparation of compounds of formula I wherein, when n is 1 , Ri is naphthyl, phenanthryl, anthryl, 5,6,7,8-tetrahydro-2-naphthyl, thienyl, benzo[b]thienyl, naphtho[2,3-b]thienyl, thianthrenyl, furyl, benzofuryl, isobenzofuryl, dibenzofuryl, xanthenyl, phenoxathiinyl, pyrrolyl, imidazolyl, pyrazolyl, pyrazinyl, pyrimidinyl, pyridazinyl, indolizinyl, isoindolyl, indolyl, indazolyl, purinyl, quinolizinyl, isoquinolyl, quinolyl, phthalazinyl, naphthyridinyl, quinoxalinyl, quinazolinyl, cinnolinyl, pteridinyl, carbazolyl, β-carbolinyl, phen- anthridinyl, acridinyl, perimidinyl, phenanthrolinyl, phenazinyl, isothiazolyl, phenothiazinyl, isoxazolyl, furazanyl, biphenyl, terphenyl, fluorenyl or phenoxazinyl, each of which is unsubstituted or substituted by fluorine, hydroxy, C C 18 alkyl, C C 18 alkoxy, C C 18 alkylthio, di- (C r C 4 alkyl)amino, phenyl, benzyl, benzoyl or by benzoyloxy or R^ is a radical of formula II or III when n is 2, Ri is phenylene or naphthylene each unsubstituted or substituted by d-C 4 alkyl or by fluorine; or is -R 6 -X-R 7 -, R 2 , R 3 , R 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, C r C 25 - alkyl, C 7 -C 9 phenylalkyl, unsubstituted or C 1 -C 4 alkyl-substituted phenyl, unsubstituted or C C 4 alkyl-substituted C 5 -C 8 cycloalkyl; CrC^alkoxy, C C 18 alkylthio, C r C 4 alkylamino, di- (C r C 4 alkyl)amino, CrC 25 alkanoyloxy, C r C 25 alkanoylamino; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by N— R 8 ; C 6 -C 9 cycloalkylcarbonyloxy, benzoyloxy or C r C 12 alkyl- substituted benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R 4 or the radicals R 4 and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R is additionally -(CH 2 ) p -COR 9 or -(CH 2 ) q OH or, when R 3 and R 5 are hydrogen, R 4 is additionally a radical of formula IV wherein R^ is as defined above for the case where n = 1 , R 6 and R 7 are each independently of the other phenylene or naphthylene each unsubstituted or substituted by C r C alkyl, R 8 is C C 8 alkyl, / R 12 R 9 is hydroxy, - 1 r+ — O -Jr M , C r C 18 alkoxy or -N R 13 R 10 and Rn are each independently of the other hydrogen, CF 3 , d-C 2 alkyl or phenyl, or R 10 and Ru, together with the carbon atom to which they are bonded, form a C 5 -C 8 cycloalkyl- idene ring unsubstituted or substituted by from 1 to 3 C 1 -C alkyl groups; R 12 and R 1 are each independently of the other hydrogen or C r C 18 alkyl, R 14 is hydrogen or C C 18 alkyl, Ri9, 20 , R 21 , R 22 and R 23 are each independently of the others hydrogen, fluorine, hydroxy, d-C^alkyl; C 2 -C 25 alkyl interrupted by oxygen, sulfur or by N — R ; C C 25 alkoxy; / 8 \ C 2 -C 25 alkoxy interrupted by oxygen, sulfur or by N— R 8 ; C r C 25 alkylthio, C 7 -C 9 phenyl- alkyl, C 7 -C 9 phenylalkoxy, unsubstituted or C r C 4 alkyl-substituted phenyl; unsubstituted or C r C 4 alkyl-substituted phenoxy; unsubstituted or C r C 4 alkyl-substituted C 5 -C 8 cycloalkyl; unsubstituted or C C alkyl-substituted C 5 -C 8 cycloalkoxy; di(C 1 -C alkyl)amino, C C 25 - alkanoyl; C 3 -C 25 alkanoyl interrupted by oxygen, sulfur or by N — R ; C C 25 alkanoyloxy; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by N— R 8 ; d-dsalkanoylamino, C β -Cgcycloalkylcarbonyl, C 6 -C 9 cycloalkylcarbonyloxy, benzoyl or CrC 12 alkyl-substituted R 27 0 benzoyl; benzoyloxy or C Cι 2 alkyl-substituted benzoyloxy; — 0 —- C — C — R 9 or R 28 R29 R 30 — O — C — C — O — R,, , I I 3 H R 31 R 24 is hydrogen, C r C 4 alkyl, or unsubstituted or C C 4 alkyl-substituted phenyl, R 25 and R 26 are hydrogen, C r C 4 alkyl or phenyl, with the proviso that at least one of the radicals R 25 and R 26 is hydrogen, R 27 and R 28 are each independently of the other hydrogen, d-C alkyl or phenyl, R 29 is hydrogen or C C 4 alkyl, R 30 is hydrogen, unsubstituted or d-C alkyl-substituted phenyl; C r C 25 alkyl; C 2 -C 25 alkyl inter¬ rupted by oxygen, sulfur or by N— R 8 ; C 7 -C 9 phenylalkyl unsubstituted or substituted on the phenyl radical by from 1 to 3 C C 4 alkyl groups; or C 7 -C 25 phenylalkyl interrupted by oxy¬ gen, sulfur or by N— R 8 and unsubstituted or substituted on the phenyl radical by from 1 to 3 C C alkyl groups, R 31 is hydrogen or C 1 -C 4 alkyl, R 32 is hydrogen, C C 25 alkanoyl; C 3 -C 25 alkanoyl interrupted by oxygen, sulfur or by N— R 8 ; C 2 -C 25 alkanoyl substituted by a di(C 1 -C 6 alkyl) phosphonate group; C 6 -C 9 cyclo- alkylcarbonyl, thenoyl, furoyl, benzoyl or d-C^alkyl-substituted benzoyl; R 36 ~ R 37 R 33 is hydrogen or C C 8 alkyl, R 34 is a direct bond, C C 18 alkylene; C 2 -C 18 alkylene interrupted by oxygen, sulfur or by \ N— R ; C 2 -C 20 alkylidene, C 7 -C 20 phenylalkylιdene, C 5 -C 8 cycloalkylene, C 7 -C 8 bicyclo- / alkylene, unsubstituted or Cι-C 4 alkyl-substituted phenylene, or // W / R 12 R 35 is hydroxy, - 1 r+ -O — M , C C 18 alkoxy or '13 O R 36 is oxygen, -NH- or N _ C _ NH _ R / R 37 is C C 18 alkyl or phenyl, M is an r-valent metal cation, X is a direct bond, oxygen, sulfur or -NR 14 - n is 1 or 2, p is 0, 1 or 2, q is 1,2, 3, 4, 5 or 6, r is 1, 2 or 3, and s is 0, 1 or 2, which process comprises reacting a compound of formula V wherein RT and n are as defined above, R 2 , R 3 , R' and R 5 are each independently of the others hydrogen, fluorine, hydroxy, d-C 25 alkyl, C 7 -C 9 phenylalkyl, unsubstituted or d-C 4 alkyl-substituted phenyl, unsubstituted or d-dalkyl-substituted C 5 -C 8 -cycloalkyl; C r C 18 alkoxy, C C 18 alkylthio, C C 4 alkylamino, di(C r C alkyl)amino, C C 25 alkanoyloxy, d-C 25 alkanoylamino; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by N— R 8 ; C 6 -C 9 cycloalkylcarbonyloxy, benzoyloxy or C r C 12 alkyl- substituted benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R' 4 or the radicals R' 4 and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R' 4 is additionally -(CH 2 ) p -COR 9 or -(CH 2 ) q OH or, when R 3 and R 5 are hydrogen, R' 4 is additionally a radical of formula VI wherein R^ is as defined above for the case where n = 1 , with carbon monoxide in the presence of a catalyst. Alkanoyl having up to 25 carbon atoms is a branched or unbranched radical, for example formyl, acetyl, propionyl, butanoyl, pentanoyl, hexanoyl, heptanoyl, octanoyl, nonanoyl, deca- noyl, undecanoyl, dodecanoyl, tridecanoyl, tetradecanoyl, pentadecanoyl, hexadecanoyl, heptadecanoyl, octadecanoyl, icosanoyl or docosanoyl. Alkanoyl has preferably from 2 to 18, especially from 2 to 12, e.g. from 2 to 6, carbon atoms. Special preference is given to acetyl. C 2 -C 25 Alkanoyl substituted by a di(C C 6 alkyl) phosphonate group is, for example, (CH 3 CH 2 O) 2 POCH 2 CO-, (CH 3 0) 2 POCH 2 CO-, (CH 3 CH 2 CH 2 CH 2 O) 2 POCH 2 CO-, (CH 3 CH 2 O) 2 POCH 2 CH 2 CO-, (CH 3 O) 2 POCH 2 CH 2 CO-, (CH 3 CH 2 CH 2 CH 2 O) 2 POCH 2 CH 2 CO-, (CH 3 CH 2 O) 2 PO(CH 2 ) 4 CO-, (CH 3 CH 2 O) 2 PO(CH 2 ) 8 CO- or (CH 3 CH 2 O) 2 PO(CH 2 ) 17 CO-. Alkanoyloxy having up to 25 carbon atoms is a branched or unbranched radical, for example formyloxy, acetoxy, propionyloxy, butanoyloxy, pentanoyloxy, hexanoyloxy, heptanoyloxy, octanoyloxy, nonanoyloxy, decanoyloxy, undecanoyloxy, dodecanoyloxy, tridecanoyloxy, te- tradecanoyloxy, pentadecanoyloxy, hexadecanoyloxy, heptadecanoyloxy, octadecanoyloxy, icosanoyloxy or docosanoyloxy. Preference is given to alkanoyloxy having from 2 to 18, especially from 2 to 12, e.g. from 2 to 6, carbon atoms. Special preference is given to acetoxy. C 3 -C 25 Alkenoyloxy interrupted by oxygen, sulfur or by N — R g is, for example, CH 3 OCH 2 CH 2 CH=:CHCOO- or CH 3 OCH 2 CH 2 OCH=CHCOO-. C 3 -C 25 Alkanoyl interrupted by oxygen, sulfur or by N— -R 8 is, for example, CH 3 -O-CH 2 CO-, CH 3 -S-CH 2 CO-, CH 3 -N(CH 3 )-CH 2 CO-, CH 3 -O-CH 2 CH 2 -O-CH 2 CO-, CH 3 -(O-CH 2 CH 2 -) 2 O-CH 2 CO-, CH 3 -(O-CH 2 CH 2 -) 3 O-CH 2 CO- or CH 3 -(O-CH 2 CH 2 -) 4 O-CH 2 CO-. C 3 -C 25 Alkanoyloxy interrupted by oxygen, sulfur or by N— R 8 is, for example, CH 3 -O-CH 2 COO-, CH 3 -S-CH 2 COO-, CH 3 -N(CH 3 )-CH 2 COO-, CH 3 -0-CH 2 CH 2 -0-CH 2 COO-, CH 3 -(0-CH 2 CH 2 -) 2 O-CH 2 COO-, CH 3 -(O-CH 2 CH 2 -) 3 O-CH 2 COO- or CH 3 -(O-CH 2 CH 2 -) 4 0-CH 2 COO-. C 6 -CgCycloalkylcarbonyl is, for example, cyclopentylcarbonyl, cyclohexylcarbonyl, cyclohep- tylcarbonyl or cyclooctylcarbonyl. Preference is given to cyclohexylcarbonyl. C 6 -CgCycloalkylcarbonyloxy is, for example, cyclopentylcarbonyloxy, cyclohexylcarbonyloxy, cycloheptylcarbonyloxy or cyclooctylcarbonyloxy. Preference is given to cyclohexylcarbonyloxy. d-C 12 Alkyl-substituted benzoyl, which carries preferably from 1 to 3, especially 1 or 2, alkyl groups, is, for example, o-, m- or p-methylbenzoyl, 2,3-dimethylbenzoyl, 2,4-dimethyl- benzoyl, 2,5-dimethylbenzoyl, 2,6-dimethylbenzoyl, 3,4-dimethylbenzoyl, 3,5-dimethyl- benzoyl, 2-methyl-6-ethylbenzoyl, 4-tert-butylbenzoyl, 2-ethylbenzoyl, 2,4,6-trimethylbenzoyl, 2,6-dimethyl-4-tert-butylbenzoyl or 3,5-di-tert-butylbenzoyl. Preferred substituents are d-C 8 - alkyl, especially C 1 -C 4 alkyl. d-C 2 Alkyl-substituted benzoyloxy, which carries preferably from 1 to 3, especially 1 or 2, alkyl groups, is, for example, o-, m- or p-methylbenzoyloxy, 2,3-dimethylbenzoyloxy, 2,4-di- methylbenzoyloxy, 2,5-dimethylbenzoyloxy, 2,6-dimethylbenzoyloxy, 3,4-dimethylbenzoyloxy, 3,5-dimethylbenzoyloxy, 2-methyl-6-ethylbenzoyloxy, 4-tert-butylbenzoyloxy, 2-ethylbenzoyl- oxy, 2,4,6-trimethylbenzoyloxy, 2,6-dimethyl-4-tert-butylbenzoyloxy or 3,5-di-tert-butylbenz- oyloxy. Preferred substituents are d-C 8 alkyl, especially C C 4 aikyl. Alkyl having up to 25 carbon atoms is a branched or unbranched radical, for example methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, 2-ethylbutyl, n-pentyl, isopentyl, 1-methylpentyl, 1 ,3-dimethylbutyl, n-hexyl, 1-methylhexyl, n-heptyl, isoheptyl, 1 ,1 ,3,3-tetra- methylbutyl, 1 -methylheptyl, 3-methylheptyl, n-octyl, 2-ethylhexyl, 1 ,1 ,3-trimethylhexyl, 1 ,1 ,3,3-tetramethylpentyl, nonyl, decyl, undecyl, 1 -methylundecyl, dodecyl, 1 ,1 ,3,3,5,5- hexamethylhexyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, icosyl or docosyl. One of the preferred definitions for R 2 and R 4 is, for example, C C 18 alkyl. An especially preferred definition for R 4 is C r C 4 alkyl. C 2 -C 25 Alkyl interrupted by oxygen, sulfur or by N— R 8 is, for example, CH 3 -O-CH 2 -, CH 3 -S-CH 2 -, CH 3 -N(CH 3 )-CH 2 -, CH 3 -0-CH 2 CH 2 -O-CH 2 -, CH 3 -(O-CH 2 CH 2 -) 2 O-CH 2 -, CH 3 -(O-CH 2 CH 2 -) 3 O-CH 2 - or CH 3 -(O-CH 2 CH 2 -) 4 O-CH 2 -. C 7 -C 9 Phenylalkyl is, for example, benzyl, α-methylbenzyl, α,α-dιmethylbenzyl or 2-phenyl- ethyl Preference is given to benzyl and α,α-dιmethylbenzyl C 7 -C 9 Phenylalkyl unsubstituted or substituted on the phenyl radical by from 1 to 3 C r C 4 alkyl groups is, for example, benzyl, α-methylbenzyl, α,α-dιmethylbenzyl, 2-phenylethyl, 2-methyl- benzyl, 3-methylbenzyl, 4-methylbenzyl, 2,4-dιmethyloenzyl, 2,6-dιmethylbenzyl or 4-tert- butylbenzyl Preference is given to benzyl C 7 -C 25 Phenylalkyl interrupted by oxygen, sulfur or by N— R 8 and unsubstituted or sub¬ stituted on the phenyl radical by from 1 to 3 d-dalkyl groups is a branched or unbranched radical, for example phenoxymethyl, 2-methyl-phenoxymethyl, 3-methyl-phenoxymethyl, 4-methyl-phenoxymethyl, 2,4-dιmethyl-phenoxymethyl, 2,3-dιmethyl-phenoxymethyl, phenyl- thiomethyl, N-methyl-N-phenyl-aminomethyl, N ethyl-N-phenyl-aminomethyl, 4-tert-butyl- phenoxymethyl, 4-tert-butyl-phenoxyethoxy-methyl, 2 4-dι-tert-butyl-phenoxymethyl, 2,4-dι- tert-butyl-phenoxyethoxymethyl, phenoxyethoxyethoxyethoxymethyl, benzyloxymethyl, benz- yloxyethoxymethyl, N-benzyl-N-ethyl-aminomethyl or N-benzyl-N-isopropyl-aminomethyl C 7 -C 9 Phenylalkoxy is, for example, benzyloxy, α-methylbenzyloxy, α,α-dιmethylbenzyloxy or 2-phenylethoxy Preference is given to benzyloxy d-C Alkyl-substιtuted phenyl, which contains preferably from 1 to 3, especially 1 or 2, alkyl groups, is, for example, o-, m- or p-methylphenyl, 2,3-dιmethylphenyl, 2,4-dιmethylphenyl, 2,5-dιmethylphenyl, 2,6-dιmethylphenyl, 3,4-dιmethylphenyl, 3,5-dιmethylphenyl, 2-methyl-6- ethylphenyl, 4-tert-butylphenyl, 2-ethylphenyl or 2,6-dιethylphenyl d-dAlkyl-substituted phenoxy, which contains preferably from 1 to 3, especially 1 or 2, alkyl groups, is, for example, o-, m- or p-methylphenoxy, 2,3-dιmethylphenoxy, 2,4-dιmethylphen- oxy, 2,5-dιmethylphenoxy, 2,6-dιmethylphenoxy, 3,4-dιmethylphenoxy, 3,5-dιmethylphenoxy, 2-methyl-6-ethylphenoxy, 4-tert-butylphenoxy, 2-ethylphenoxy or 2,6-dιethylphenoxy Unsubstituted or d-C 4 alkyl-substιtuted C 5 -C 8 cycloalkyl is, for example, cyclopentyl, methyl- cyclopentyl, dimethylcyclopentyl, cyclohexyl, methylcyclohexyl, dimethylcyclohexyl, tπmethyl- cyclohexyl, tert-butylcyclohexyl, cycloheptyl or cyclooctyl Preference is given to cyclohexyl and tert-butylcyclohexyl Unsubstituted or C C 4 alkyl-substιtuted C 5 -C 8 cycloalkoxy is, for example, cyclopentyloxy, methylcyclopentyloxy, dimethylcyclopentyloxy, cyclohexyloxy, methylcyclohexyloxy, dimethyl- cyclohexyloxy, tπmethylcyclohexyloxy, tert-butylcyclohexyloxy, cycloheptyloxy or cyclooctyl- oxy Preference is given to cyclohexyloxy and tert-butylcyclohexyloxy Alkoxy having up to 25 carbon atoms is a branched or unbranched radical, for example methoxy, ethoxy, propoxy, isopropoxy, n-butoxy, isobutoxy, pentyloxy, isopentyloxy, hexyl- oxy, heptyloxy, octyloxy, decyloxy, tetradecyloxy, hexadecyloxy or octadecyloxy Preference is given to alkoxy having from 1 to 12, especially from 1 to 8, e g from 1 to 6, carbon atoms C 2 -C 25 Alkoxy interrupted by oxygen, sulfur or by N— R 8 is, for example, CH 3 -O-CH 2 CH 2 O-, CH 3 -S-CH 2 CH 2 O-, CH 3 -N(CH 3 )-CH 2 CH 2 O-, CH 3 -O-CH 2 CH 2 -O-CH 2 CH 2 O-, CH 3 -(O-CH 2 CH 2 -) 2 O-CH 2 CH 2 O-, CH 3 -(O-CH 2 CH 2 -) 3 O-CH 2 CH 2 0- or CH 3 -(0-CH 2 CH 2 -) 4 0-CH 2 CH 2 O- Alkylthio having up to 25 carbon atoms is a branched or unbranched radical, for example methylthio, ethylthio, propylthio, isopropylthio, n-butylthio, isobutylthio, pentylthio, isopentyl- thio, hexylthio, heptylthio, octylthio, decylthio, tetradecylthio, hexadecylthio or octadecylthio Preference is given to alkylthio having from 1 to 12, especially from 1 to 8, e g from 1 to 6, carbon atoms Alkylamino having up to 4 carbon atoms is a branched or unbranched radical, for example methylamino, ethylamino, propylamino, isopropylamino, n-butylamino, isobutylamino or tert- butylamino. Dι(d-C 4 alkyl)amιno means also that the two radicals are each independently of the other branched or unbranched, for example, dimethylamino, methylethylamino, diethylamino, methyl-n-propylamino, methylisopropylamino, methyl-n-butylamino, methylisobutylamino, ethylisopropylamino, ethyl-n-butylamino, ethylisobutylamino, ethyl-tert-butylammo, diethylamino, diisopropylamino, isopropyl-n-butylamino, isopropylisobutylamino, di-n-butylamino or di-isobutylamino. Alkanoylamino having up to 25 carbon atoms is a branched or unbranched radical, for example formylamino, acetylamino, propionylamino, butanoylamino, pentanoylamino, hexan- oylamino, heptanoylamino, octanoylamino, nonanoylamino, decanoylamino, undecanoyl- amino, dodecanoylamino, tndecanoylamino, tetradecanoylamino, pentadecanoylamino, hexadecanoylamino, heptadecanoylamino, octadecanoylamino, icosanoylamino or docosan- oylamino Preference is given to alkanoylamino having from 2 to 18, especially from 2 to 12, e.g. from 2 to 6, carbon atoms d-dsAlkylene is a branched or unbranched radical, for example methylene, ethylene, propylene, tπmethylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, decamethylene, dodecamethylene or octadecamethylene Preference is given to d-C 12 alkylene, especially d-C 8 alkylene An especially preferred definition for R 56 is C 2 -C 8 alkylene, especially C 4 -C 8 alkylene, for example tetramethylene or pentamethylene C 2 -C 18 Alkylene interrupted by oxygen, sulfur or by N— R 8 is, for example, -CH 2 -O-CH 2 -, -CH 2 -S-CH 2 -, -CH 2 -N(CH 3 )-CH 2 -, -CH 2 -0-CH 2 CH 2 -0-CH 2 -, -CH 2 -(O-CH 2 CH 2 -) 2 0-CH 2 -, -CH 2 -(0-CH 2 CH 2 -) 3 0-CH 2 -, -CH 2 -(O-CH 2 CH 2 -) 4 O-CH 2 - or -CH 2 CH 2 -S-CH 2 CH 2 - Alkylidene having from 2 to 20 carbon atoms is, for example, ethylidene, propylidene, butyl- idene, pentylidene, 4-methylpentylιdene, heptylidene, nonylidene, tπdecylidene, nonadecyl- idene, 1 -methylethylidene, 1-ethylpropylidene or 1-ethylpentylidene. Preference is given to C 2 -C 8 alkylidene. Phenylalkylidene having from 7 to 20 carbon atoms is, for example, benzylidene, 2-phenyl- ethylidene or 1 -phenyl-2-hexylidene. Preference is given to d-C 9 phenylalkylidene. C 5 -C 8 Cycloalkylene is a saturated hydrocarbon group having two free valences and at least one ring unit and is, for example, cyclopentylene, cyclohexylene, cycloheptylene or cyclo- octylene. Preference is given to cyclohexylene. C 7 -C 8 Bicycloalkylene is, for example, bicycloheptylene or bicyciooctylene. Phenylene or naphthylene each unsubstituted or substituted by C r C 4 alkyl is, for example, 1 ,2-, 1 ,3- or 1 ,4-phenylene or 1 ,2-, 1 ,3-, 1 ,4-, 1 ,6-, 1 ,7-, 2,6- or 2,7-naphthylene. Preference is given to 1 ,4-phenylene. A C 5 -C 8 cycloalkylidene ring substituted by C dalkyl, which contains preferably from 1 to 3, especially 1 or 2, branched or unbranched alkyl group radicals, is, for example, cyclopentyl- idene, methylcyclopentylidene, dimethylcyclopentylidene, cyclohexylidene, methyicyclohexyli- dene, dimethylcyclohexylidene, trimethylcyclohexyiidene, tert-butylcyclohexylidene, cyclo- heptylidene or cyclooctylidene. Preference is given to cyclohexylidene and tert-butylcyclohexylidene. A mono-, di- or tri-valent metal cation is preferably an alkali metal cation, alkaline earth metal cation or aluminium cation, for example Na + , K + , Mg ++ , Ca ++ or Al +++ . Dendrimeric, oligomeric or polymeric C 4 -C 10 ohydrocarbon radicals are, for example, those such as are disclosed by R. Mϋlhaupt et al. in Angew. Chem., Int. Ed. 32 (9), 1306 (1993). Of interest is a process for the preparation of compounds of formula I wherein, when n is 2, Ri is phenylene or -R 6 -X-R 7 -, R 6 and R 7 are phenylene, X is oxygen or -NR 1 -, and Rι 4 is d-dalkyl. Likewise of interest is a process for the preparation of compounds of formula I wherein R 19 , R 20 , R 21 , R 22 and R 23 are each independently of the others hydrogen, fluorine, hydroxy, d-C 18 alkyl; C 2 -C 18 alkyl interrupted by oxygen or by sulfur; d-C 18 alkoxy; C 2 -C 18 alkoxy interrupted by oxygen or by sulfur; C C 18 alkylthio, C 7 -C 9 phenylalkyl, C 7 -C 9 phenylalkoxy, unsubstituted or C C 4 alkyl-substituted phenyl; phenoxy, cyclohexyl, C 5 -C 8 cycloalkoxy, di(C C 4 - alkyl)amino, C C 12 alkanoyl; C 3 -C 12 alkanoyl interrupted by oxygen or by sulfur; C C 12 - alkanoyloxy; C 3 -C 12 alkanoyloxy interrupted by oxygen or by sulfur; C r C 12 alkanoylamino, cyclohexylcarbonyl, cyclohexylcarbonyloxy, benzoyl or C 1 -C 4 alkyl-substituted benzoyl; benzoyloxy or C C 4 alkyl-substituted benzoyloxy; • — O — ^ C — s C — R 9 or R '28 29 30 — O — C — C — O — R„, , I I ^ H R 31 R 2 is hydrogen or C r C 4 alkyl, R 25 and R 26 are hydrogen or C C alkyl, with the proviso that at least one of the radicals R 25 and R 26 is hydrogen, R 27 and R 28 are each independently of the other hydrogen or C,-C 4 alkyl, R 29 is hydrogen, R 30 is hydrogen, phenyl, C C 18 alkyl; C 2 -C 18 alkyl interrupted by oxygen or by sulfur; C 7 -C 9 - phenylalkyl; or C 7 -C 18 phenylalkyl interrupted by oxygen or by sulfur and unsubstituted or substituted on the phenyl radical by from 1 to 3 d-C 4 alkyl groups, R 31 is hydrogen or C C alkyl, R 32 is hydrogen, C r C 18 alkanoyl; C 3 -C 12 alkanoyl interrupted by oxygen or by sulfur; C 2 -C 12 - alkanoyl substituted by a di(d-C- 6 alkyl) phosphonate group; C 6 -C 9 cycloalkylcarbonyl, benzoyl , _ ^ ~ R 36 ~ R 37 R 33 is hydrogen or Cι-C 4 alkyl, R 34 is C r C 12 alkylene, C 2 -C 8 alkylidene, C 7 -Cι 2 phenylalkylidene, C 5 -C 8 cycloalkylene or phenylene, r+ R 35 is hydroxy, —O ■ M or C C 18 alkoxy, R 36 is oxygen or -NH-, R 37 is d-C 8 alkyl or phenyl, and s is 1 or 2. Of special interest is a process for the preparation of compounds of formula I wherein, when n is 1 , Ri is phenanthryl, thienyl, dibenzofuryl, unsubstituted or d-dalkyl-substituted carbazolyl; or fluorenyl, or R^ is a radical of formula II wherein R 19 , R 20 , R 21 , R 22 and R 23 are each independently of the others hydrogen, fluorine, hydroxy, d-C 18 alkyl, d-Cι 8 alkoxy, d-C 18 alkylthio, phenyl, benzoyl, benzoyloxy or , 29 , 30 -o- -c— c-o- ■ R '32 I I H R 31 R 29 is hydrogen, R 30 is hydrogen, phenyl or d-C 18 alkyl, R 31 is hydrogen or C C 4 alkyl, and R 32 is hydrogen, C r C 12 alkanoyl or benzoyl. Likewise of special interest is a process for the preparation of compounds of formula I wherein R 19 is hydrogen or C 1 -C 4 alkyl, R 20 is hydrogen or C 1 -C 4 alkyl, R 21 is hydrogen, fluorine, hydroxy, C r C 12 alkyl, C C 4 alkoxy, d-C 4 alkylthio, phenyl or -O-CH 2 -CH 2 -O-R 32 , R 22 is hydrogen or C C 4 alkyl, R 23 is hydrogen or d-dalkyl, and R 32 is C r C alkanoyl. Of special interest is, more especially, a process for the preparation of compounds of formula I wherein R 2 , R 3 , R 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, d-C 25 - alkyl, C 7 -C 9 phenylalkyl, unsubstituted or C r C 4 alkyl-substituted phenyl; unsubstituted or d-C 4 alkyl-substituted C 5 -C 8 cycloalkyl; C C 12 alkoxy, C r C 12 alkylthio, C C 4 alkylamino, di- (C 1 -C 4 alkyl)amino, C C 18 alkanoyloxy, d-Cι 8 alkanoylamino; C 3 -C 18 alkanoyloxy interrupted by oxygen, sulfur or by N— R 8 ; C 6 -C 9 cycloalkylcarbonyloxy, benzoyloxy or C C 8 alkyl- substituted benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R 4 or the radicals R 4 and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R 4 is additionally -(CH 2 ) p -COR 9 or -(CH 2 ) q OH or, when R 3 and R 5 are hydrogen, R is additionally a radical of formula IV R 8 is d-C 6 alkyl, / R 1 2 R 9 is hydroxy, C C 18 alkoxy or — R, R 10 and Rn are methyl groups or, together with the carbon atom to which they are bonded, form a C 5 -C 8 cycloalkylidene ring unsubstituted or substituted by from 1 to 3 C r C 4 alkyl groups; R 12 and R 13 are each independently of the other hydrogen or C r C 8 alkyl, and q is 2, 3, 4, 5 or 6. Special preference is given to a process for the preparation of compounds of formula I wherein at least two of the radicals R 2 , R 3 , R 4 and R 5 are hydrogen. Also very especially preferred is a process for the preparation of compounds of formula I wherein R 3 and R 5 are hydrogen. Very special preference is given to a process for the preparation of compounds of formula I wherein R 2 , R 3 , R 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, C r C 18 - alkyl, C 7 -C 9 phenylalkyl, phenyl, C 5 -C 8 cycloalkyl, d-C 6 alkoxy, cyclohexylcarbonyloxy or benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R 4 or the radicals R 4 and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R is additionally -(CH 2 ) p -COR 9 , or, when R 3 and R 5 are hydrogen, R is additionally a radical of formula IV, R 9 is hydroxy or d-C 18 alkoxy, and R 10 and Rn are methyl groups or, together with the carbon atom to which they are bonded, form a C 5 -C 8 cycloalkylιdene ring Of preferential interest is a process for the preparation of compounds of formula I wherein R 2 is d-C 18 alkyl or cyclohexyl, R 3 is hydrogen, R 4 is d-C 4 alkyl, cyclohexyl, -(CH 2 ) p -COR 9 or a radical of formula IV, R 5 is hydrogen, R 9 is d-dalkyl, R 10 and Rn, together with the carbon atom to which they are bonded, form a cyclohexylidene ring, and p is 2 Likewise of preferential interest is a process for the preparation of compounds of formula I wherein R 2 is Cι-C 18 alkyl or cyclohexyl, R 3 is hydrogen, R' is d-dalkyl, cyclohexyl, -(CH 2 ) p -COR 9 or a radical of formula VI, R 5 is hydrogen, R 9 is d-dalkyl, R 10 and Rn, together with the carbon atom to which they are bonded, form a cyclohexylidene ring, and Some of the monomeπc compounds of formula V are present in the form of dimers of formula Va V Va This equilibrium is temperature-dependent. The dimeric compound of formula Va may also be referred to as a Diels-Alder adduct. The dimeric compounds of formula Va can, together with further compounds of formula V, form trimeric, tetrameric or oligomeric compounds. For the process according to the invention there may be used both the pure monomeric compound of formula V and the pure dimeric compound of formula Va, a mixture of the two compounds of formula V and Va or a mixture of any possible monomeric, dimeric, trimeric or oligomeric compounds derived from the compound of formula V. Under the reaction conditions, the dimeric, trimeric or oligomeric compounds derived from the compound of formula V form again the monomeric compound of formula V, which reacts with carbon monoxide and shifts the equilibrium towards the monomeric side. Preferred reaction conditions for the process according to the invention are as follows: The reaction may be carried out at an elevated temperature, especially at temperatures of from 50 to 200°C, in the melt or in a solvent, optionally under slight pressure. Special preference is given to carrying out the reaction using a large molar excess of carbon monoxide. Special preference is therefore given to a process for the preparation of compounds of formula I wherein the ratio of molar quantities of the compound of formula V to carbon monoxide is from 1 :1 to 1 :5000. Preference is given to using, as solvent, pressurised carbon monoxide, which at the same time constitutes the reactant As solvents there may, however, also be used solvents that do not participate in the reaction, for example hydrocarbons, ethers and aromatic compounds. Preferred hydrocarbons are, for example, octane and commercially available isomeric fractions, for example hexane fraction, petroleum ether and ligroin Preferred ethers are, for example, dibutyl ether, methyl tert-butyl ether and diethylene glycol dimethyl ether. Examples of aromatic compounds are toluene and xylene A preferred catalyst for the process for the preparation of compounds of formula I is a metal catalyst, especially a metal catalyst that is capable of forming a complex with carbon monoxide, for example a transition metal catalyst Of preferential interest is a process for the preparation of compounds of formula I wherein the transition metal catalyst is a titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, ruthenium, osmium, cobalt, rhodium, indium, nickel, palladium, platinum or copper catalyst Of special interest is a titanium, vanadium, chromium, manganese, iron, ruthenium, cobalt, rhodium, nickel or palladium catalyst Especially preferred catalysts are, for example, V(CO) 6 ; Cr(CO) 6 ; Mn(CO) 6 ; Mn 2 (CO) 10 ; Mn(CO) 5 Br, Fe(CO) 5 , Fe 2 (CO) 9 , Fe 3 (CO) 12 , Na 2 Fe(CO) 4 ; [(cyclopentadιenyl)Fe(CO) 2 ] 2 , Co 2 (CO) 8 ; Co 4 (CO) 12 , NaCo(CO) 4 , Nι(CO) 4 ; Nι(CN) 2 , NιPR' 3 X' 2 wherein R' is unsubstituted or substituted phenyl, cyclohexyl or isopropyl and X' is chlorine or bromine; Nι(PPh 3 ) 2 (CO) 2 , Pd(PPh 3 ) 4 ; Pd(PR' 3 ) 2 X" 2 wherein R' is as defined above and X" is chlorine, bromine or iodine, Pd(PPh 2 Me) 2 CI 2 ; Pd(AsPh 3 ) 2 CI 2 , Pd(Br)(Ph)(PPh 3 ) 2 ; Pd(dιpp) 2 wherein dipp is 1 ,3-bιs(dιιso- propylphosphιno)propane, PdCI 2 (R"CN) 2 wherein R" is alkyl or phenyl, Pd(acetate) 2 + PR' 3 wherein R' is as defined above, R' 2 PCH 2 CH 2 CH 2 PR' 2 wherein R' is as defined above; Pd 2 (dι- benzylidene acetone) 3 + PR' 3 wherein R' is as defined above, Lι 2 PdCI 4 ; PdCI 2 + MgCI 2 ; PdCI 2 + CuCI 2 ; HPtCI 6 ; [PtCI 2 (SnCI 3 ) 2 f; [Pt(SnCI 3 ) 5 f; Pt(PPh 3 ) 2 (CO) 2 ; Mo(CO) 6 ; Tc 2 (CO) 10 ; Ru(CO) 5 ; Ru 3 (CO) 12 ; RuCI 3 ; Rh 2 (CO) 8 ; Rh 4 (CO) 12 ; Rh 6 (CO) 16 ; [Rh(CO) 2 CI] 2 ; [Rh(cycloocta- diene)CI] 2 ; Rh 2 (acetate) 4 ; Rh(PPh 3 ) 2 CI; W(CO) 6 ; Re 2 (CO) 10 ; Os(CO) 5 ; Os 2 (CO) 9 ; Os 3 (CO) 12 ; lr 2 (CO) 8 and lr 4 (CO) 12 . A very especially preferred catalyst is, for example, tetrakis(triphenylphosphine)palladium(0). Advantageously, the catalyst is used in an amount of from 0.01 to 20 % by weight, especially from 0.1 to 10 % by weight, e.g. from 0.1 to 5 % by weight, based on the weight of the compound of formula V used. The reaction can also be accelerated by addition of a catalytic amount of a protonic acid or Lewis acid. Suitable protonic acids are, for example, acids of inorganic or organic salts, for example hydrochloric acid, sulfuric acid, phosphoric acid, methanesulfonic acid, p-toluenesulfonic acid or carboxylic acids, for example formic acid, acetic acid and trifluoroacetic acid. Special preference is given to formic acid and trifluoroacetic acid. Suitable Lewis acids are, for example, tin tetrachloride, aluminium chloride, zinc chloride, boron trifluoride etherate or anhydrides, for example carboxylic acid anhydrides, especially acetic anhydride. Special preference is given to tin tetrachloride, aluminium chloride and acetic anhydride. The starting compounds of formula V are, in some instances, known or can be prepared in analogy to the method described by L. Jurd in J. Heterocyclic Chem. 25, 89-96 (1988). A preferred process for the preparation of the starting compounds of formula V wherein the general symbols are as defined above, comprises converting a compound of formula VII wherein R^ and n are as defined above, R 2 , R 3 , R" 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, d-C 25 - alkyl, C 7 -C 9 phenyialkyl, unsubstituted or d-C 4 alkyl-substιtuted phenyl, unsubstituted or d-dalkyl-substituted C 5 -C 8 cycloalkyl; d-C 18 alkoxy, d-C 18 alkylthιo, d-C 4 alkylamιno, di(C C 4 alkyl)amιno, C r C 25 alkanoyloxy, d-C 25 alkanoylamιno; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by N—R 8 ; C 6 -C 9 cycloalkylcarbonyloxy, benzoyloxy or d-C 12 alkyl- substituted benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R" 4 or the radicals R" 4 and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R" is additionally -(CH 2 ) p -COR 9 or -(CH 2 ) q OH or, when R 3 and R 5 are hydrogen, R" 4 is additionally a radical of formula VIII wherein ^ is as defined above for the case where n = 1 , R 2 , R 10 and Rn are as defined above, R 50 is -OR 51 , -SR 52 , or • N R 56 R 5 is C r C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen or by sulfur; C 7 -C 9 phenylalkyl, unsubstituted or C 1 -C 4 alkyl-substituted C 5 -C 8 cycloalkyl; unsubstituted or C r C alkyl- substituted phenyl, R 52 is C C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen or by sulfur; C 7 -C 9 phenylalkyl, unsubstituted or d-C 4 alkyl-substituted C 5 -C 8 cycloalkyl; unsubstituted or C C 4 alkyl- substituted phenyl, R 53 and R^ are each independently of the other hydrogen, C C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen or by sulfur; C 7 -C 9 phenylalkyl, unsubstituted or C r C 4 alkyl-substituted C 5 -C 8 cycloalkyl; or a dendrimeric, oligomeric or polymeric C 4 -C 10 ohydrocarbon radical, R 55 is C C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen or by sulfur; C 7 -C 9 phenylalkyl, unsubstituted or C C 4 alkyl-substituted C 5 -C 8 cycloalkyl; unsubstituted or C r C alkyl- substituted phenyl; or a radical of formula IX wherein R 1 ( R 2 , R 3 , R" 4 , R 5 and n are as defined above, R 56 is unsubstituted or d-C 4 alkyl-substituted C 2 -C 12 alkylene, thermally or using light. In that conversion the radical HR 50 is removed. The reaction may be carried out at an elevated temperature, especially at temperatures of from 60 to 180°C, in the melt or in a solvent. The reaction may be carried out in the melt or in a solvent, optionally under slight pressure. As solvents there may be used solvents that do not participate in the reaction, for example hydrocarbons, ethers and aromatic compounds. Preferred hydrocarbons are, for example, octane and commercially available isomeric fractions, for example hexane fraction, petroleum ether and ligroin. Preferred ethers are, for example, dibutyl ether, methyl tert-butyl ether and diethylene glycol dimethyl ether. Examples of aromatic compounds are toluene and xylene. The reaction can also be accelerated by addition of a catalytic to excess amount of a protonic acid. Suitable protonic acids are, for example, acids of inorganic or organic salts, for example hydrochloric acid, sulfuric acid, phosphoric acid, methanesulfonic acid, p-toluenesulfonic acid or carboxylic acids, for example acetic acid and trifluoroacetic acid. Special preference is given to trifluoroacetic acid. Preference is given to the process for the preparation of compounds of formula V wherein R 50 is -OR 5 ι, -SR 52 , -N R 51 is d-C 12 alkyl; C 2 -C 12 alkyl interrupted by oxygen; benzyl, C 5 -C 8 cycloalkyl or phenyl, R 52 is Cι-C 2 alkyl; C 2 -C 12 alkyl interrupted by oxygen; benzyl, C 5 -C 8 cycloalkyl or phenyl, R 53 and R 54 are each independently of the other hydrogen, d-C 12 alkyl; C 2 -C 12 alkyl interrupted by oxygen; benzyl, C 5 -C 8 cycloalkyl, or a dendrimeric or oligomeric or polymeric C 4 -C 50 hydrocarbon radical, R 55 is d-C 12 alkyl; C 2 -C 12 alkyl interrupted by oxygen; benzyl, C 5 -C 8 cycloalkyl, phenyl or a radical of formula IX wherein R R 2 , R 3 , R" 4 , R 5 and n are as defined above, and R 56 is C 2 -C 8 alkyiene. Special preference is given to the process for the preparation of compounds of formula V wherein R 53 and R 54 are each independently of the other hydrogen, C r C 12 alkyl, benzyl, cyclohexyl or a dendrimeric C -C 30 hydrocarbon radical, R 55 is C r C 12 alkyl, benzyl, cyclohexyl, phenyl or a radical of formula IX wherein R u R 2 , R 3 , R" 4 , R 5 and n are as defined above, and R 56 is C 4 -C 8 alkylene Of special interest is the process for the preparation of compounds of formula V wherein R '5 c 3 Rso IS N \ or ■ N R 56 R 54 R 53 and R 54 are each independently of the other C l2 alkyl, benzyl or a dendrimeric C 4 -C 30 hydrocarbon radical, and R 56 is C 4 -C 6 alkylene Special preference is given to the process for the preparation of compounds of formula V wherein the conversion to the compound of formula V is carried out in the presence of an acid, especially a carboxylic acid, for example acetic acid and trifluoroacetic acid The compounds of formula VII are known or can be obtained by methods known per se, such as those disclosed in Examples 1 a, 2a and 3a The compounds of formula I can also be prepared in a so-called one-pot process, starting from the compounds of formula VII In that process, the compounds of formula V are prepared in situ and, without being isolated, are reacted further with carbon monoxide in the presence of a catalyst The present invention therefore relates also to a process for the preparation of compounds of formula I wherein the general symbols are as defined above, which process comprises converting a compound of formula VII wherein the general symbols are as defined above, thermally or using light, to form a compound of formula V wherein the general symbols are as defined above, and then, without its being isolated, reacting that compound with carbon monoxide in the presence of a catalyst. The definitions of the general symbols for the one-pot process according to the invention are the same as for the other process of the invention discussed hereinbefore The preferred reaction parameters for the one-pot process correspond to the preferences for the two separate steps, which have already been discussed in detail. The invention relates also to novel compounds of formula V wherein, when n is 1 , Ri is naphthyl, phenanthryl, anthryl, 5,6,7,8-tetrahydro-2-naphthyl, thienyl, benzo[b]thιenyi, naphtho[2,3-b]thιenyl, thianthrenyl, furyl, benzofuryl, isobenzofuryl, dibenzofuryl, xanthenyl, phenoxathnnyl, pyrrolyl, imidazolyl, pyrazolyl, pyrazinyl, pyrimidinyl, pyndazinyl, indohzinyl, isoindolyl, indolyl, indazolyl, puπnyl, quinolizinyl, isoquinolyl, quinolyl, phthalazinyl, naphthyndinyl, quinoxalinyl, quinazohnyl, cinnolinyl, ptendinyl, carbazolyl, β-carbo nyl, phen- anthndinyl, acπdinyl, peπmidinyl, phenanthroiinyl, phenazinyl, isothiazolyl, phenothiazinyl, isoxazolyl, furazanyl, biphenyl, terphenyl, fluorenyl or phenoxazinyl, each of which is unsubstituted or substituted by fluorine, hydroxy, C r C 18 alkyl, d-C 18 alkoxy, d-C 18 alkylthιo, di (d-dalkyl)amιno, phenyl, benzyl, benzoyl or by benzoyloxy or R^ is a radical of formula II or III when n is 2, R is phenylene or naphthylene each unsubstituted or substituted by d-dalkyl or by fluorine; or is -R 6 -X-R 7 -, R 2 , R 3 , R' 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, C r C 25 - alkyl, C 7 -C 9 phenylalkyl, unsubstituted or C 1 -C 4 alkyl-substituted phenyl, unsubstituted or d-dalkyl-substituted C 5 -C 8 cycloalkyl; C C 18 alkoxy, d-C 18 alkylthio, d-dalkylamino, di- (C C 4 alkyl)amino, Cι-C 25 alkanoyloxy, C C 25 alkanoylamino; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by N— R 8 ; C 6 -C 9 cycloalkylcarbonyloxy, benzoyloxy or C r C 12 alkyl- substituted benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R' 4 or the radicals R' 4 and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R' 4 is additionally -(CH 2 ) p -COR 9 or -(CH 2 ) q OH or, when R 3 and R 5 are hydrogen, R' 4 is additionally a radical of formula VI wherein R^ is as defined above for the case where n = 1 , R 6 and R 7 are each independently of the other phenylene or naphthylene each unsubstituted or substituted by d-dalkyl, R 8 is C r C 8 alkyl, r+ | / R 9 is hydroxy, -O d-C 18 alkoxy or M " V 13 R 10 and Rn are each independently of the other hydrogen, CF 3 , C r C 12 alkyl or phenyl, or R 10 and Rn, together with the carbon atom to which they are bonded, form a C 5 -C 8 cycloalkyl- idene ring unsubstituted or substituted by from 1 to 3 d-dalkyl groups; R 12 and R 13 are each independently of the other hydrogen or d-C 18 alkyl, Rι 4 is hydrogen or C C 18 alkyl, R 19 , R 20 , R 2 ι, R 22 and R 23 are each independently of the others hydrogen, fluorine, hydroxy, C C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen, sulfur or by N — R ; d-C 25 alkoxy; C 2 -C 25 alkoxy interrupted by oxygen, sulfur or by N— R 8 ; C r C 25 alkylthio, C 7 -C 9 phenyl- alkyl, C 7 -C 9 phenylalkoxy, unsubstituted or d-dalkyl-substituted phenyl; unsubstituted or d-dalkyl-substituted phenoxy; unsubstituted or C,-C 4 alkyl-substituted C 5 -C 8 cycloalkyl; unsubstituted or d-C 4 alkyl-substituted C 5 -C 8 cycloalkoxy; di(d-C 4 alkyl)amino, C C 25 - alkanoyl; C 3 -C 25 alkanoyl interrupted by oxygen, sulfur or by N— R 8 ; C C 25 alkanoyloxy; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by ; C 1 -C 25 alkanoylamino, Ce-Cgcycloalkylcarbonyl, C 6 -C 9 cycloalkylcarbonyloxy, benzoyl or C r C 12 alkyl-substituted benzoyl; benzoyloxy or d-C 12 alkyl-substituted benzoyloxy; — O — C — C — R 9 or R '28 0 — C — C — O - R P I I 3 H R 31 R 24 is hydrogen, d-dalkyl, or unsubstituted or C r C 4 alkyl-substituted phenyl, R 25 and R 26 are hydrogen, d-C 4 alkyl or phenyl, with the proviso that at least one of the radicals R 25 and R 26 is hydrogen, R 27 and R 28 are each independently of the other hydrogen, d-C 4 alkyl or phenyl, R 29 is hydrogen or Cι-C 4 alkyl, R 30 is hydrogen, unsubstituted or C r C 4 alkyl-substituted phenyl; C C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen, sulfur or by N— R 8 ; C 7 -C 9 phenylalkyl unsubstituted or substituted on the phenyl radical by from 1 to 3 d-C 4 alkyl groups; or C 7 -C 25 phenylalkyl interrupted by oxygen, sulfur or by N — R 8 and unsubstituted or substituted on the phenyl radical by from 1 to 3 d-dalkyl groups, R 31 is hydrogen or C 1 -C 4 alkyl, R 32 is hydrogen, C r C 25 alkanoyl; C 3 -C 25 alkanoyl interrupted by oxygen, sulfur or by \ N— R H ; C 2 -C 25 alkanoyl substituted by a di(C r C 6 alkyl) phosphonate group; C 6 -C 9 cyclo- / alkylcarbonyl, thenoyl, furoyl, benzoyl or C r C 12 alkyl-substituted benzoyl; — R 36 ~ " R 37 R 33 is hydrogen or C r C 8 alkyl, R 34 is a direct bond, d-C 18 alkylene; C 2 -Cι 8 alkylene interrupted by oxygen, sulfur or by N— R ; C 2 -C 20 alkylidene, C 7 -C 20 phenylalkylidene, C 5 -C 8 cycloalkylene, C 7 -C 8 bicyclo- / 8 alkylene, unsubstituted or d-dalkyl-substituted phenylene, ( ^ or ^ l \ O S / R 12 1 r+ R 35 is hydroxy, — O Cι-C 18 alkoxy or -N F 0 R 36 is oxygen, -NH- or N _ C _ NH _ R , / R 37 is C r Cι 8 alkyl or phenyl, M is an r-valent metal cation, X is a direct bond, oxygen, sulfur or -NR 14 -, n is 1 or 2, p is 0, 1 or 2, q is 1 , 2, 3, 4, 5 or 6, r is 1 , 2 or 3, and s is 0, 1 or 2, with the proviso that when R 2 and R' 4 are hydrogen, methyl or tert-butyl or when R 3 and R' 4 , together with the carbon atom to which they are bonded, form a benzo ring, at least one of the radicals R i9 , R 20 , R 2 ι, R 22 and R 23 is other than hydrogen and Ri is not unsubstituted naphthyl; with the proviso that when R 2 and R' are hydrogen or d-dalkyl, R 19 and R 23 are other than hydroxy; and with the proviso that when R 2 and R' 4 are hydrogen, d-dalkyl or methoxy, R 20 , R 2 ι and R 22 are other than methoxy. The preferred general symbols for the novel compounds of formula V correspond to those in the preferred general symbols set out hereinbefore for the process according to the invention for the preparation of compounds of formula I. The following Examples illustrate the invention further. Parts or percentages relate to weight. Example 1 : Process for the preparation of 5,7-di-tert-butyl-3-(3,4-dimethyl-phenyl)-3H- benzofuran-2-one (compound (101 ), Table 1 ). a) Preparation of 2,4-di-tert-butyl-6-[dimethylamino-(3,4-dimethyl-phenyl)-methyl]-phenol (compound (201 ), Table 2). A mixture of 26.82 g (0.13 mol) of 2,4-di-tert-butylphenol, 17.44 g (0.13 mol) of 3,4-di- methylbenzaldehyde and 22.0 g (0.20 mol) of a 40 % aqueous solution of dimethylamine is heated in a closed vessel at 140°C for 10 hours, the internal pressure rising to 4 bar. After cooling to room temperature, the reaction mixture is poured into 100 ml of water and extracted twice using ethyl acetate. The organic phases are combined, dried over sodium sulfate and concentrated using a vacuum rotary evaporator. Crystallisation of the residue from isopropanol yields 28.25 g (59 %) of 2,4-di-tert-butyl-6-[dimethylamino-(3,4-dimethyl- phenyl)-methyl]-phenol, m.p. 82-85°C, (compound (201), Table 2). Molecular weight C 25 H 37 NO (367.58). Analysis, calculated: C 81.69; H 10.15; N 3.81 %. Analysis, found: C 81.78; H 10.05; N 3.80 %. 1 HNMR (300 MHz, CDCI 3 , ppm): 1.18 (s, 9H); 1.43 (s, 9H); 2.21 (s, 6H); 2.24 (s, 6H); 4.27 (s, 1 H); 6.74 (d, 1 H); 7.1 1 (m, 4H); 12.43 (s, 1 H). b) Preparation of 2,4-di-tert-butyl-6-(3,4-dimethylbenzylidene)-cyclohexa-2,4-dienone (compound (301 ), Table 3) and the corresponding dimer (compound (401 ), Table 4). 60 ml of dry toluene and 2.9 g (25.5 mmol) of trifluoroacetic acid are added, under argon, to 6.24 g (17 mmol) of 2,4-di-tert-butyl-6-[dimethylamino-(3,4-dimethyl-phenyl)-methyl]-phenol (compound (201 ), Table 2), prepared according to Example 1a. The reaction mixture is then maintained at 110°C for 6 hours. After cooling to room temperature, the mixture is poured into 50 ml of water and extracted three times using ethyl acetate. The organic phases are combined, dried over sodium sulfate and concentrated using a vacuum rotary evaporator. Crystallisation of the residue from isopropanol yields 4.48 g (82 %) of a mixture of 2,4-di-tert- butyl-6-(3,4-dimethyl-benzylidene)-cyclohexa-2,4-dienone (compound (301 ), Table 3) and the corresponding dimer (compound (401), Table 4), m.p. 214-217°C. b') Alternative process for the preparation of 2,4-di-tert-butyl-6-(3,4-dimethylbenzylidene)- cyclohexa-2,4-dienone (compound (301 ), Table 3) and the corresponding dimer (compound (401 ), Table 4). A solution of 33 85 g (0 10 mol) of 3,5-dι-tert-butyl-2-hydroxy-phenyl-(3,4-dιmethyl-phenyl)- methanone (compound (203), Table 2) in 130 ml of dry tetrahydrofuran is slowly added dropwise, at 10 D C, to a suspension of 7 57 g (0 20 mol) of lithium aluminium hydride in 150 ml of dry tetrahydrofuran, during which the reaction temperature should not exceed 15°C After the addition, the reaction mixture is stirred for a further 30 minutes at room temperature The excess of lithium aluminium hydride is destroyed by means of basic hydrolysis and the salts formed are filtered off The residue is washed with tetrahydrofuran and the filtrates are concentrated using a vacuum rotary evaporator The crude alcohol (compound (204), Table 2) is taken up in 100 ml of isopropanol, 0 2 g (1 05 mmol) of p-toluenesulfonic acid is added and the mixture is boiled under reflux for 18 hours The reaction mixture is then concentrated using a vacuum rotary evaporator Crystallisation of the residue from isopropanol yields 17 1 1 g (53 %) of a mixture of 2,4-dι-tert-butyl-6-(3,4- dιmethyl-benzylιdene)-cyclohexa-2,4-dιenone (compound (301 ), Table 3) and the corresponding dimer (compound (401 ), Table 4) m p 214-217°C c) Preparation of 5,7-dι-tert-butyl-3-(3,4-dιmethyl phenyl)-3H-benzofuran-2-one (compound (101), Table 1) A solution of 645 mg (2 0 mmol) of a mixture of 2,4-dι-tert-butyl-6-(3,4-dιmethyl- benzylιdene)-cyclohexa-2,4-dιenone (compound (301 ) Table 3) and the corresponding dimer (compound (401 ), Table 4), prepared according to Example 1 b, in 7 ml of toluene is degassed using argon and then 58 mg (0 05 mmol) of tetrakιs(tπphenylphosphιne)- palladιum(O) and 23 mg (0 20 mmol) of trifluoroacetic acid are added The autoclave is flushed with carbon monoxide and sealed, and a carbon monoxide pressure of 5 bar is then applied The reaction mixture is maintained at 80°C for 20 hours After cooling to room temperature, the reaction mixture is poured into water and extracted three times using ethyl acetate The organic phases are combined, dried over sodium sulfate and concentrated using a vacuum rotary evaporator Crystallisation of the residue from ethanol yields 464 mg (66 %) of 5,7-dι-tert-butyl-3-(3,4-dιmethyl-phenyl)-3H-benzofuran-2-one (compound (101 ), Table 1 ), m p 130-132°C Analysis, calculated C 82 24, H 8 63 % Analysis, found C 82 20 H 8 68 % Example 2: Process for the preparation of 5,7-di-tert-butyl-3-phenyl-3H-benzofuran-2-one (compound (102), Table 1 ). a) Preparation of 2,4-di-tert-butyl-6-(dimethylamino-phenyl-methyl)-phenol (compound (202), Table 2). A mixture of 51.5 g (0.25 mol) of 2,4-di-tert-butylphenol, 26.5 g (0.25 mol) of benzaldehyde and 42.3 g (0.375 mol) of a 40 % aqueous solution of dimethylamine is heated in a closed vessel at 140°C for 10 hours, the internal pressure rising to 5 bar. After cooling to room temperature, the reaction mixture solidifies. Crystallisation of the residue from isopropanol yields 65.2 g (77 %) of 2,4-di-tert-butyl-6-(dimethylamino-phenyl-methyl)-phenol, m.p. 120- 123°C (compound (202), Table 2). Molecular weight C 23 H 33 NO (339.52). Analysis, calculated: C 81.37; H 9.80; N 4.13 %. Analysis, found: C 81.25; H 9.86; N 4.00 %. 1 HNMR (300 MHz, CDCI 3 , ppm): 1.19 (s, 9H); 1.44 (s, 9H); 2.26 (s, 6H); 4.34 (s, 1 H); 6.75 (d, 1 H); 7.29 (m, 6H); 12.43 (s, 1 H). b) Preparation of 6-benzylidene-2,4-di-tert-butyl-cyclohexa-2,4-dienone (compound (302), Table 3) and the corresponding dimer (compound (402), Table 4). 60 ml of dry toluene and 2.9 g (25.5 mmol) of trifluoroacetic acid are added, under argon, to 5.75 g (17 mmol) of 2,4-di-tert-butyl-6-(dimethylamino-phenyl-methyl)-phenol (compound (202), Table 2), prepared according to Example 2a. The reaction mixture is then maintained at 110°C for 6 hours. After cooling to room temperature, the mixture is poured into 50 ml of water and extracted three times using ethyl acetate. The organic phases are combined, dried over sodium sulfate and concentrated using a vacuum rotary evaporator. Crystallisation of the residue from acetonitrile yields 2.58 g (52 %) of a mixture of 6- benzylidene-2,4-di-tert-butyl-cyclohexa-2,4-dienone (compound (302), Table 3) and the corresponding dimer (compound (402), Table 4), m.p. 164-166°C. Analysis, calculated for (302) and (402): C 85.67; H 8.90 %. Analysis, found for (302) and (402): C 85.36; H 8.93 %. c) Preparation of 5,7-di-tert-butyl-3-phenyl-3H-benzofuran-2-one (compound (102), Table 1). A solution of 589 mg (2.0 mmol) of a mixture of 6-benzylidene-2,4-di-tert-butyl-cyclohexa- 2,4-dienone (compound (302), Table 3) and the corresponding dimer (compound (402), Table 4), prepared according to Example 2b, in 7 ml of toluene is degassed using argon and then 58 mg (0.05 mmol) of tetrakιs(trιphenylphosphιne)palladιum(0) and 23 mg (0.20 mmol) of trifluoroacetic acid are added The autoclave is flushed with carbon monoxide and sealed, and a carbon monoxide pressure of 5 bar is then applied. The reaction mixture is maintained at 80°C for 20 hours. After cooling to room temperature, the reaction mixture is poured into water and extracted three times using ethyl acetate The organic phases are combined, dried over sodium sulfate and concentrated using a vacuum rotary evaporator Crystallisation of the residue from isopropanol yields 580 mg (90 %) of 5,7-dι-tert-butyl-3- phenyl-3H-benzofuran-2-one (compound (102), Table 1 ), m.p. 116-119°C. Analysis, calculated: C 81.95; H 8.13 % Analysis, found. C 81 93, H 8 13 %. Example 3: One-pot process for the preparation of compound (103) (Table 1 ), starting from compound (205) (Table 2) a) Preparation of compound (205) (Table 2) A mixture of 45.67 g (0.12 mol) of 1 ,1 '-bιs[4,4'-(2-tert-butyl-1 -hydroxy-phenyl)]cyclohexane, 25.5 g (0.24 mol) of benzaldehyde and 40.6 g (0 36 mol) of a 40 % aqueous solution of dimethylamine is heated in a closed vessel at 140°C for 10 hours, the internal pressure rising to 4.5 bar After cooling to room temperature, the reaction mixture solidifies. Crystallisation of the residue from isopropanol yields 64 3 g (83 %) of compound (205) (Table 2), m.p 156-159°C Molecular weight C 44 H 58 N 2 0 2 (646.96) Analysis, calculated C 81.69; H 9.04; N 4.33 % Analysis, found C 81 46, H 9 05, N 4.18 % b) One-pot process for the preparation of compound (103) (Table 1 ), starting from compound (205) (Table 2). A solution of 6 47 g (0.01 mol) of compound (205), prepared according to Example 3a, in 60 ml of dry toluene is degassed using argon and then 0.87 g (0.75 mmol) of tetrakis- (tπphenylphosphιne)palladιum(O) and 3.43 g (0 03 mol) of trifluoroacetic acid are added. The autoclave is flushed with carbon monoxide and sealed, and a carbon monoxide pressure of 7.5 bar is then applied The reaction mixture is maintained at 140°C for 18 hours After cooling to room temperature, the reaction mixture is poured into water and extracted three times using ethyl acetate The organic phases are combined, dried over sodium sulfate and concentrated using a vacuum rotary evaporator. Crystallisation of the residue from isopropanol yields 4.30 g (70 %) of compound (103) (Table 1 ), m.p. 199-202°C. Empirical formula C 42 H 44 O 4 . Analysis, calculated: C 82.32; H 7.24 %. Analysis, found: C 81.91 ; H 7.20 %. 1 HNMR (300 MHz, CDCI 3 , ppm): 1.34 (s, 18H); 1.48 (m, 6H); 2.17 (m, 4H); 4.80 (s, 2H); 6.94 (s, 2H); 7.14 (m, 6H); 7.29 (m, 6H). Example 4: One-pot process for the preparation of compound (102) (Table 1), starting from compound (202) (Table 2). A solution of 640 mg (1.89 mmol) of compound (202), prepared according to Example 2a, in 10 ml of dry toluene is degassed using argon and then 55 mg (0.05 mmol) of tetrakis- (triphenylphosphine)palladium(O) and 323 mg (2.83 mmol) of trifluoroacetic acid are added. The autoclave is flushed with carbon monoxide and sealed, and a carbon monoxide pressure of 8 bar is then applied. The reaction mixture is maintained at 140°C for 19 hours. After cooling to room temperature, the reaction mixture is poured into water and extracted three times using ethyl acetate. The organic phases are combined, dried over sodium sulfate and concentrated using a vacuum rotary evaporator. Filtration of the residue on silica gel using ethyl acetate and crystallisation of the pure fractions from isopropanol yields 561 mg (92 %) of compound (102) (Table 1), m.p. 116-119°C. Analysis, calculated: C 81.95; H 8.13 %. Analysis, found: C 81.90; H 8.15 %. Compound (102) (Table 1 ) may also be obtained in analogy to Example 4 using acetic anhydride instead of trifluoroacetic acid. Example 5: Process for the preparation of compound (104), Table 1. a) Preparation of compound (206), Table 2. Compound (206), Table 2, m.p. 205-206°C, is obtained in analogy to Example 1a using 0.065 mol of terephthalaldehyde (Fluka 86410) instead of 3,4-dimethylbenzaldehyde. Molecular weight C 40 H 60 N 2 O 2 (600.932). Analysis, calculated: C 79.95; H 10.06; N 4.66 %. Analysis, found: C 80.22; H 10.01 ; N 4.70 %. 1 HNMR (300 MHz, CDCI 3 , ppm): 1.16 (s, 18H); 1.41 (s, 18H); 2.21 (s, 12H); 4.27 (s, 2H); 6.69 (d, 2H); 7.13 (d, 2H); 7.35 (s, 4H); 12.38 (s, 2H). b) Preparation of compound (104), Table 1. A solution of 1.14 g (1.89 mmol) of compound (206), prepared according to Example 5a, in 10 ml of dry toluene is degassed using argon and then 55 mg (0.05 mmol) of tetra- kis(trιphenylphosphιne)palladιum(0) and 348 mg (7.56 mmol) of formic acid are added. The autoclave is flushed with carbon monoxide and sealed, and a carbon monoxide pressure of 8 bar is then applied. The reaction mixture is maintained at 110°C for 4 hours. After cooling to room temperature, the reaction mixture is poured into water and extracted three times using ethyl acetate. The organic phases are combined, dried over sodium sulfate and concentrated using a vacuum rotary evaporator. Filtration of the residue on silica gel using ethyl acetate and crystallisation of the pure fractions from isopropanol yields 942 mg (88 %) of compound (104) (Table 1 ), m.p. 212-215°C. Molecular weight C 38 H 46 O 4 (566.784). 1 HNMR (300 MHz, CDCI 3 , ppm): 1.28 (s, 18H); 1.42 (s, 18H), 4 82 (s, 2H); 7.05 (d, 2H); 7.25 (s, 4H); 7.32 (d, 2H). Example 6' Process for the preparation of compound (102), Table 1 a) Preparation of compound (208), Table 2 37.46 g (0 44 mol) of pipendine are added dropwise, at room temperature, to a solution of 21.22 g (0.20 mol) of benzaldehyde in 70 ml of toluene, slight exothermicity is observed. The slightly yellow-coloured solution is boiled under reflux for 2 hours, approximately 4 ml of water are separated off using a water separator, and a solution of 39.20 g (0.19 mol) of 2,4- di-tert-butylphenol in 30 ml of toluene is then added dropwise. The reaction mixture is boiled at reflux for a further hour and then cooled to room temperature; the solvent is distilled off using a vacuum rotary evaporator. Crystallisation of the residue from toluene yields 50.14 g (70 %) of compound (208) (Table 2), m.p. 140-141 °C. Molecular weight C 26 H 37 NO (379.588). Analysis, calculated: C 82.27, H 9.82; N 3.69 %. Analysis, found: C 82.06; H 9.83; N 3.77 %. 1 HNMR (300 MHz, CDCI 3 , ppm) 1.24 (s, 9H); 1.50 (s, 11 H), 1.66 (bs, 4H), 2.39 (bs, 4H), 4.48 (s, 1 H); 6.79 (d, 1 H), 7.32 (m, 6H); 12.60 (s, 1 H) b) Preparation of compound (102), Table 1. Compound (102), Table 1 , m.p. 116-119°C, is obtained in analogy to Example 4 using compound (208), prepared according to Example 6a, instead of compound (202). Example 7: Process for the preparation of compound (105), Table 1. a) Preparation of compound (207), Table 2. 8.29 g (97.33 mmol) of pipehdine are added dropwise, at room temperature, to a solution of 4.71 g (44.43 mmol) of benzaldehyde in 50 ml of toluene; slight exothermicity is observed. The slightly yellow-coloured solution is boiled under reflux for 15 hours; approximately 1 ml of water is separated off using a water separator, and a solution of 10.0 g (42.3 mmol) of 3- (3-tert-butyl-4-hydroxy-phenyl)-propionic acid methyl ester in 15 ml of toluene is then added dropwise. The reaction mixture is boiled at reflux for a further hour and then cooled to room temperature; the solvent is distilled off using a vacuum rotary evaporator. Filtration of the residue over silica gel using ethyl acetate and crystallisation of the pure fractions from hexane yields 12.31 g (71 %) of compound (207) (Table 2), m.p. 120-122°C. Molecular weight C 26 H 35 NO 3 (409.571). Analysis, calculated: C 76.25; H 8.61 ; N 3.42 %. Analysis, found: C 76.18; H 8.73; N 3.35 %. 1 HNMR (300 MHz, CDCI 3 , ppm): 1.36 (s, 9H); 1.46 (m, 6H); 2.37 (bm, 4H); 2.41 (m, 2H) 2.66 (m, 2H); 3.53 (s, 3H); 4.33 (s, 2H); 6.49 (d, 1 H); 6.86 (d, 1 H); 7.23 (m, 5H); 12.60 (s, 1 H). b) Preparation of compound (105), Table 1. Compound (105), Table 1 , is obtained as a slightly yellow oil, in analogy to Example 5 using compound (207), prepared according to Example 7a, instead of compound (206). Molecular weight C 22 H 24 O 4 (352.432). Analysis, calculated: C 74.98; H 6.86 %. Analysis, found: C 75.08; H 6.89 %. 1 HNMR (300 MHz, CDCI 3 , ppm): 1.35 (s, 9H); 2.52 (t, 2H); 2.84 (t, 2H); 3.56 (s, 3H); 4.75 (s, 1 H); 6.80 (d, 1 H); 7.04 (d, 1 H); 7.14 (m, 2H); 7.29 (m, 3H). Example 8: One-pot process for the preparation of compound (102) (Table 1), starting from compound (202) (Table 2) using various catalysts. A solution of 640 mg (1.89 mmol) of compound (202), prepared according to Example 2a, in 10 ml of dry toluene is degassed using argon, and the catalyst given in the Table and 348 mg (7.56 mmol) of formic acid are then added. The autoclave is flushed with carbon monoxide and sealed, and a carbon monoxide pressure of 8 bar is then applied. The reaction mixture is maintained at 110°C for 4 hours. After cooling to room temperature, the reaction mixture is poured into water and extracted three times using ethyl acetate. The organic phases are combined, dried over sodium sulfate and concentrated using a vacuum rotary evaporator. Filtration of the residue on silica gel using ethyl acetate and crystallisation of the pure fractions from isopropanol yields compound (102) (Table 1), m.p. 116-119°C. The results are collated in Table 5.

Claims: What is claimed is: A process for the preparation of compounds of formula wherein, when n is 1 , Ri is naphthyl, phenanthryl, anthryl, 5,6,7,8-tetrahydro-2-naphthyl, thienyl, benzo[b]thienyl, naphtho[2,3-b]thienyl, thianthrenyl, furyl, benzofuryl, isobenzofuryl, dibenzofuryl, xanthenyl, phenoxathiinyl, pyrrolyl, imidazolyl, pyrazolyl, pyrazinyl, pyrimidinyl, pyridazinyl, indolizinyl, isoindolyl, indolyl, indazolyl, purinyl, quinolizinyl, isoquinolyl, quinolyl, phthalazinyl, naphthyridinyl, quinoxalinyl, quinazolinyl, cinnolinyl, pteridinyl, carbazolyl, β-carbolinyl, phen- anthridinyl, acridinyl, perimidinyl, phenanthrolinyl, phenazinyl, isothiazolyl, phenothiazinyl, isoxazolyl, furazanyl, biphenyl, terphenyl, fluorenyl or phenoxazinyl, each of which is unsubstituted or substituted by fluorine, hydroxy, C r Cι 8 alkyl, Cι-Cι 8 alkoxy, C r C 18 alkylthio, di- (C C 4 alkyl)amino, phenyl, benzyl, benzoyl or by benzoyloxy or Ri is a radical of formula II or III when n is 2, Ri is phenylene or naphthylene each unsubstituted or substituted by C r C 4 alkyl or by fluorine; or is -R 6 -X-R 7 -, R 2 , R 3 , R 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, C r C 25 - alkyl, C 7 -C 9 phenylalkyl, unsubstituted or Cι-C alkyl-substituted phenyl, unsubstituted or Cι-C 4 alkyl-substituted C 5 -C 8 cycloalkyl; C r Cι 8 alkoxy, Cι-Cι 8 alkylthio, Cι-C 4 alkylamino, di- (C r C 4 alkyl)amino, C C 25 alkanoyloxy, d-dsaikanoylamino; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by N— R 8 ; C 6 -C 9 cycloalkylcarbonyloxy, benzoyloxy or C r Cι 2 alkyl- substituted benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R 4 or the radicals R 4 and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R is additionally -(CH 2 ) p -COR 9 or -(CH 2 ) q OH or, when R 3 and R 5 are hydrogen, R 4 is additionally a radical of formula IV wherein R, is as defined above for the case where n = 1 , R 6 and R 7 are each independently of the other phenylene or naphthylene each unsubstituted or substituted by d-dalkyl, R 8 is C r C 8 alkyl, / R 12 R 9 is hydroxy, - 1 r+ — O — M , C r Cι 8 alkoxy or -N \ R 13 R 10 and R are each independently of the other hydrogen, CF 3 , C r C 12 alkyl or phenyl, or R 10 and Rn, together with the carbon atom to which they are bonded, form a C 5 -C 8 cycloalkyl- idene ring unsubstituted or substituted by from 1 to 3 d-dalkyl groups; R 12 and R 13 are each independently of the other hydrogen or C C 18 alkyl, Ri 4 is hydrogen or d-C 18 alkyl, R 19 , R 20 , R 2 i > R 22 and R 23 are each independently of the others hydrogen, fluorine, hydroxy, C C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen, sulfur or by N— R 8 ; C r C 25 alkoxy; C 2 -C 25 alkoxy interrupted by oxygen, sulfur or by N— R 8 ; d-C 25 alkylthio, C 7 -C 9 phenyl- alkyl, C 7 -C 9 phenylaikoxy, unsubstituted or d-C 4 alkyl-substituted phenyl; unsubstituted or d-dalkyl-substituted phenoxy; unsubstituted or d-C 4 alkyl-substituted C 5 -C 8 cycloalkyl; unsubstituted or d-dalkyl-substituted C 5 -C 8 cycloalkoxy; di(CrC 4 alkyl)amino, C C 25 - alkanoyl; C 3 -C 25 alkanoyl interrupted by oxygen, sulfur or by N— R 8 ; C C 25 alkanoyloxy; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by — R 8 ; d-C 25 alkanoylamino, Ce-Cgcycloalkylcarbonyl, C 6 -C 9 cycloalkylcarbonyloxy, benzoyl or C r C 12 alkyl-substituted benzoyl; benzoyloxy or C r C 12 alkyl-substituted benzoyloxy; — O — C — ? C, — R g or R 28 I 29 γ 30 — O — C — C — 0 - R 3? , I I H R 31 R 2 is hydrogen, d-dalkyl, or unsubstituted or C 1 -C 4 alkyl-substituted phenyl, R 25 and R 26 are hydrogen, d-dalkyl or phenyl, with the proviso that at least one of the radicals R 25 and R 26 is hydrogen, R 27 and R 28 are each independently of the other hydrogen, d-dalkyl or phenyl, R 29 is hydrogen or C,-C 4 alkyl, R 30 is hydrogen, unsubstituted or C r C 4 alkyl-substituted phenyl; d-C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen, sulfur or by — R 8 ; C 7 -C 9 phenylalkyl unsubstituted or substituted on the phenyl radical by from 1 to 3 C r C 4 alkyl groups; or C 7 -C 25 phenylalkyl interrupted by oxygen, sulfur or by — R 8 and unsubstituted or substituted on the phenyl radical by from 1 to 3 C r C 4 alkyl groups, R 31 is hydrogen or d-C 4 alkyl, R 32 is hydrogen, C r C 25 alkanoyl; C 3 -C 25 alkanoyl interrupted by oxygen, sulfur or by \ N _ Rft ; c 2 -C 25 alkanoyl substituted by a di(C r C 6 alkyl) phosphonate group; C 6 -C 9 / cycloalkylcarbonyl, thenoyl, furoyl, benzoyl or C r C 12 alkyl-substituted benzoyl; R 33 is hydrogen or C r C 8 alkyl, R 34 is a direct bond, d-Cι 8 alkylene; C 2 -C 18 alkylene interrupted by oxygen, sulfur or by \ N— R R ; C 2 -C 20 alkylidene, C 7 -C 20 phenylalkylidene, C 5 -C 8 cycloalkylene, C 7 -C 8 bicyclo- / alkylene, unsubstituted or C r C 4 alkyl-substituted phenylene, ^ J _^ or ^ W O s ' / R 12 R 35 is hydroxy, 1 r + — O d-Cι 8 alkoxy or — N s R< O R 36 is oxygen, -NH- or N _ C _ NH _ R 37 / R 37 is CrC^alkyl or phenyl, M is an r-valent metal cation, X is a direct bond, oxygen, sulfur or -NR 14 -, n is 1 or 2, p is 0, 1 or 2, q is 1 , 2, 3, 4, 5 or 6, r is 1 , 2 or 3, and s is 0, 1 or 2, which process comprises reacting a compound of formula V wherein Ri and n are as defined above, R 2 , R 3 , R' 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, d-C 25 alkyl, C 7 -C 9 phenylalkyl, unsubstituted or d-dalkyl-substituted phenyl, unsubstituted or Ci-dalkyl-substituted C 5 -C 8 -cycloalkyl; C r C 18 alkoxy, d-Cι 8 alkylthio, d-dalkylamino, di(C r C 4 alkyl)amino, C 1 -C 25 alkanoyloxy, CrC 25 alkanoylamino; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by N— R 8 ; C 6 -C 9 cycloalkylcarbonyloxy, benzoyloxy or C r C 12 alkyl- substituted benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R' 4 or the radicals R' and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R' 4 is additionally -(CH 2 ) p -COR 9 or -(CH 2 ) q OH or, when R 3 and R 5 are hydrogen, R' is additionally a radical of formula VI wherein Ri is as defined above for the case where n = 1 , with carbon monoxide in the presence of a catalyst. 2. A process according to claim 1 , wherein, when n is 2, R t is phenylene or -R 6 -X-R 7 -, R 6 and R 7 are phenylene, X is oxygen or -NR 1 4-, and R, 4 is d-dalkyl. 3. A process according to claim 1 , wherein Rig, R 20 , R 21 , R 22 and R 23 are each independently of the others hydrogen, fluorine, hydroxy, d-C 18 alkyl; C 2 -C 18 alkyl interrupted by oxygen or by sulfur; C r C 18 alkoxy; C 2 -Cι 8 alkoxy interrupted by oxygen or by sulfur; C r C 18 alkylthio, C 7 -C 9 phenylalkyl, C 7 -C 9 phenylalkoxy, unsubstituted or d-C 4 alkyl substituted phenyl; phenoxy, cyclohexyl, C 5 -C 8 cycloalkoxy, di(d-C 4 - alkyl)amino, C Cι 2 alkanoyl; C 3 -Cι 2 alkanoyl interrupted by oxygen or by sulfur; C r C 12 alkan- oyloxy; C 3 -Cι 2 alkanoyloxy interrupted by oxygen or by sulfur; C r Cι 2 alkanoylamino, cyclohexylcarbonyl, cyclohexylcarbonyloxy, benzoyl or d-C 4 alkyl-substituted benzoyl; benzoyloxy or C r C 4 alkyl-substituted benzoyloxy; — O — 0 - R 32 , R 24 is hydrogen or d-C 4 alkyl, R 25 and R 26 are hydrogen or C r C 4 alkyl, with the proviso that at least one of the radicals R 25 and R 26 is hydrogen, R 27 and R 28 are each independently of the other hydrogen or d-C 4 alkyl, R 29 is hydrogen, R 30 is hydrogen, phenyl, d-dealkyl; C 2 -C 18 alkyl interrupted by oxygen or by sulfur; C 7 -C 9 - phenylalkyl; or C 7 -Cι 8 phenylalkyl interrupted by oxygen or by sulfur and unsubstituted or substituted on the phenyl radical by from 1 to 3 d-dalkyl groups, R 3 ι is hydrogen or C r C 4 alkyl, R 32 is hydrogen, C C 18 alkanoyl; C 3 -Cι 2 alkanoyl interrupted by oxygen or by sulfur; C 2 -C 12 - alkanoyl substituted by a di(C C 6 alkyl) phosphonate group; C 6 -C 9 cycloalkylcarbonyl, benzoyl, R 33 is hydrogen or d-dalkyl, R 3 is Cι-C 12 alkylene, C 2 -C 8 alkylidene, C 7 -C 12 phenylalkylidene, C 5 -C 8 cycloalkylene or phenylene, R 35 is hydroxy, - 1 r + -O -J-M or d-C 18 alkoxy, R 36 is oxygen or -NH-, R 37 is Cι-C 8 alkyl or phenyl, and s is 1 or 2. 4. A process according to claim 1 , wherein, when n is 1 , Ri is phenanthryl, thienyl, dibenzofuryl, unsubstituted or d-dalkyl-substituted carbazolyl; or fluorenyl, or Ri is a radical of formula II wherein R 19 , R 20 , R 21 , R 22 and R 23 are each independently of the others hydrogen, fluorine, hydroxy, d-C 18 alkyl, C C 18 alkoxy, C r Cι 8 alkylthio, phenyl, benzoyl, benzoyloxy or I 29 | 30 — O — C — C -O- R 3.2 ' I H R, R 29 is hydrogen, R 30 is hydrogen, phenyl or C Cι 8 alkyl, R 31 is hydrogen or C C 4 alkyl, and R 32 is hydrogen, C r C 12 alkanoyl or benzoyl. 5. A process according to claim 4, wherein Rι 9 is hydrogen or C r C 4 alkyl, R 20 is hydrogen or C r C alkyl, R 2i is hydrogen, fluorine, hydroxy, Cι-C 12 alkyl, C C 4 alkoxy, C 1 -C 4 alkylthio, phenyl or -O-CH 2 -CH 2 -O-R 32 , R 22 is hydrogen or C C 4 alkyl, R 23 is hydrogen or C C 4 alkyl, and R 32 is C r C 4 alkanoyl. 6. A process according to claim 1 , wherein R 2 , R 3 , R 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, C C 25 - alkyl, C 7 -C 9 phenylalkyl, unsubstituted or d-C 4 alkyl-substituted phenyl; unsubstituted or d-dalkyl-substituted C 5 -C 8 cycloalkyl; CrCι 2 alkoxy, C r Cι 2 alkylthio, C C alkylamino, di- (C r C 4 alkyl)amino, C r C 18 alkanoyloxy, C r C 18 alkanoylamino; C 3 -C 18 alkanoyloxy interrupted by oxygen, sulfur or by X N— R 8 ; C 6 -C 9 cycloalkylcarbonyloxy, benzoyloxy or Cι-C 8 alkyl- substituted benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R 4 or the radicals R and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R 4 is additionally -(CH 2 ) P -COR 9 or -(CH 2 ) q OH or, when R 3 and R 5 are hydrogen, R 4 is additionally a radical of formula IV R 8 is Cι-C 6 alkyl, / R 12 R 9 is hydroxy, Cι-C 18 alkoxy or — N^ R 13 R 10 and Rn are methyl groups or, together with the carbon atom to which they are bonded, form a C 5 -C 8 cycloalkylidene ring unsubstituted or substituted by from 1 to 3 d-dalkyl groups; R 12 and R 13 are each independently of the other hydrogen or C r C 8 alkyl, and q is 2, 3, 4, 5 or 6. 7. A process according to claim 1 , wherein at least two of the radicals R 2 , R 3 , R 4 and R 5 are hydrogen. 8. A process according to claim 1 , wherein R 3 and R 5 are hydrogen. 9. A process according to claim 1 , wherein R 2 , R 3 , R 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, C C 18 - alkyl, C 7 -C 9 phenylalkyl, phenyl, C 5 -C 8 cycloalkyl, C r C 6 alkoxy, cyclohexylcarbonyloxy or benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R 4 or the radicals R 4 and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R 4 is additionally -(CH 2 ) p -COR 9 , or, when R 3 and R 5 are hydrogen, R 4 is additionally a radical of formula IV, R 9 is hydroxy or C Cι 8 alkoxy, and R 10 and Rn are methyl groups or, together with the carbon atom to which they are bonded, form a C 5 -C 8 cycloalkylidene ring. 10. A process according to claim 1 , wherein R 2 is d-Cι 8 alkyl or cyclohexyl, R 3 is hydrogen, R 4 is d-dalkyl, cyclohexyl, -(CH 2 ) p -COR 9 or a radical of formula IV, R 5 is hydrogen, R 9 is d-C 4 alkyl, Rio and Rn, together with the carbon atom to which they are bonded, form a cyclohexylidene ring, and p is 2. 11. A process according to claim 1 , wherein R 2 is C r Cι 8 alkyl or cyclohexyl, R 3 is hydrogen, R' is d-dalkyl, cyclohexyl, -(CH 2 ) p -COR 9 or a radical of formula VI, R 5 is hydrogen, Rg is d-dalkyl, Rio and Rn, together with the carbon atom to which they are bonded, form a cyclohexylidene ring, and p is 2. 12. A process according to claim 1 , wherein the catalyst is a metal catalyst. 13. A process according to claim 12, wherein the metal catalyst is a metal catalyst that forms a complex with carbon monoxide. 14. A process according to claim 12, wherein the metal catalyst is a transition metal catalyst 15. A process according to claim 14, wherein the transition metal catalyst is a titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, ruthenium, osmium, cobalt, rhodium, indium, nickel, palladium, platinum or copper catalyst 16. A process according to claim 14, wherein the transition metal catalyst is a titanium, vanadium, chromium, manganese, iron, ruthenium, cobalt, rhodium, nickel or palladium catalyst 17. A process according to claim 1 , wherein the ratio of molar quantities of the compound of formula V to carbon monoxide is from 1 1 to 1 5000 18. A process for the preparation of compounds of formula I wherein the general symbols are as defined in claim 1 , which process comprises converting a compound of formula VII wherein Ri and n are as defined in claim 1 , R 2 , R 3 , R" 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, d-C 25 - alkyl, C 7 -C 9 phenylalkyl, unsubstituted or C C 4 alkyl-substituted phenyl, unsubstituted or d-dalkyl-substituted C 5 -C 8 cycloalkyl; C r Cι 8 alkoxy, C r Cι 8 alkylthio, C r C 4 alkylamino, di(CrC alkyl)amino, C r C 25 alkanoyloxy, CrC 25 alkanoylamino; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by N— R 8 ; C 6 -C 9 cycloalkylcarbonyloxy, benzoyloxy or Cι-C 12 alkyl- substituted benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R" or the radicals R" and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R" 4 is additionally -(CH 2 ) p -COR 9 or -(CH 2 ) q OH or, when R 3 and R 5 are hydrogen, R" is additionally a radical of formula VIII wherein R, is as defined in claim 1 for the case where n = 1 , R 2 , R 10 and Rn are as defined in claim 1 , R 50 is -OR 5 ι, -SR , -N N- -R 55 R 5 ι is Cι-C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen or by sulfur; C 7 -C 9 phenylalkyl, unsubstituted or d-dalkyl-substituted C 5 -C 8 cycloalkyl; unsubstituted or d-dalkyl substituted phenyl, R 52 is Cι-C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen or by sulfur; C 7 -C 9 phenylalkyl, unsubstituted or d-daikyl-substituted C 5 -C 8 cycloalkyl; unsubstituted or d-dalkyl-substituted phenyl, R 53 and R^ are each independently of the other hydrogen, d-C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen or by sulfur; C 7 -C 9 phenylalkyl, unsubstituted or d-dalkyl-substituted Cs-Cscycloalkyl; or a dendrimeric, oligomeric or polymeric C 4 -Cι 00 hydrocarbon radical, R 55 is CrC 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen or by sulfur; C 7 -C 9 phenylalkyl, unsubstituted or Ci-dalkyl-substituted C 5 -C 8 cycloalkyl; unsubstituted or d-C 4 alkyl-substituted phenyl; or a radical of formula IX wherein Ri and n are as defined in claim 1 , R 56 is unsubstituted or d-dalkyl-substituted C 2 -C 12 alkylene, thermally or using light, to form a compound of formula V wherein the general symbols are as defined in claim 1 , and then, without its being isolated, reacting that compound with carbon monoxide in the presence of a catalyst. 19. A process according to claim 18, wherein R '53 / \ / \ R 50 is -OR 5 ι, -SR 52, -N N ( O , N N -R 55 or R 54 \ / \ / • N R 56 R 5i is C r Cι 2 alkyl; C 2 -C 12 alkyl interrupted by oxygen; benzyl, C 5 -C 8 cycloalkyl or phenyl, R 52 is C Cι 2 alkyl; C 2 -Cι 2 alkyl interrupted by oxygen; benzyl, C 5 -C 8 cycloalkyl or phenyl, R 53 and R 54 are each independently of the other hydrogen, C Cι 2 alkyl; C 2 -Cι 2 alkyl interrupted by oxygen; benzyl, C 5 -C 8 cycloalkyl, or a dendrimeric or oligomeric or polymeric C 4 -C 50 hydrocarbon radical, R 55 is C r Cι 2 alkyl; C 2 -Cι 2 alkyl interrupted by oxygen; benzyl, C 5 -C 8 cycloalkyl, phenyl or a radical of formula IX wherein Ri and n are as defined in claim 1 , and R 56 is C 2 -C 8 alkylene. 20. A process according to claim 18, wherein R 53 and R^ are each independently of the other hydrogen, C C 12 alkyl, benzyl, cyclohexyl or a dendrimeric C -C 30 hydrocarbon radical, R 55 is C r C 12 alkyl, benzyl, cyclohexyl, phenyl or a radical of formula IX wherein R^ and n are as defined in claim 1 , and R 56 is C 4 -C 8 alkylene. 21. A process according to claim 18, wherein R ' c 53 ■ Rso is — or — N R 56 , R 54 R 53 and R^ are each independently of the other d-C^alkyl, benzyl or a dendrimeric C -C 30 hydrocarbon radical, and R 56 is C 4 -C 6 alkylene. 22. A process according to claim 18, wherein the conversion to a compound of formula V is carried out in the presence of an acid. 23. A compound of formula V wherein, when n is 1 , Ri is naphthyl, phenanthryl, anthryl, 5,6,7,8-tetrahydro-2-naphthyl, thienyl, benzo[b]thienyl, naphtho[2,3-b]thienyl, thianthrenyl, furyl, benzofuryl, isobenzofuryl, dibenzofuryl, xanthenyl, phenoxathiinyl, pyrrolyl, imidazolyl, pyrazolyl, pyrazinyl, pyrimidinyl, pyridazinyl, indolizinyl, isoindolyl, indolyl, indazolyl, purinyl, quinolizinyl, isoquinolyl, quinolyl, phthalazinyl, naphthyridinyl, quinoxalinyl, quinazolinyl, cinnolinyl, pteridinyl, carbazolyl, β-carbolinyl, phen- anthridinyl, ac dinyl, perimidinyl, phenanthrolinyl, phenazinyl, isothiazolyl, phenothiazinyl, isoxazolyl, furazanyl, biphenyl, terphenyl, fluorenyl or phenoxazinyl, each of which is unsubstituted or substituted by fluorine, hydroxy, C r Cι 8 alkyl, d-Cι 8 alkoxy, C Cι 8 alkylthio, di- (d-C 4 alkyl)amino, phenyl, benzyl, benzoyl or by benzoyloxy or Ri is a radical of formula II or III when n is 2, Ri is phenylene or naphthylene each unsubstituted or substituted by C r C 4 alkyl or by fluorine; or is -R 6 -X-R 7 -, R 2 , R 3 , R' 4 and R 5 are each independently of the others hydrogen, fluorine, hydroxy, C r C 25 - alkyl, C 7 -C 9 phenylalkyl, unsubstituted or C C 4 alkyl-substituted phenyl, unsubstituted or d-dalkyl-substituted C 5 -C 8 cycloalkyl; Cι-Cι 8 alkoxy, Cι-Cι 8 alkyithio, C r C 4 alkylamino, di- (Cι-C 4 alkyl)amino, Cι-C 25 alkanoyloxy, Cι-C 25 alkanoylamino; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by X — R 8 ; C 6 -C 9 cycloalkylcarbonyloxy, benzoyloxy or C r C 12 alkyl- substituted benzoyloxy, or furthermore the radicals R 2 and R 3 or the radicals R 3 and R' 4 or the radicals R' and R 5 , together with the carbon atoms to which they are bonded, form a benzo ring, R' 4 is additionally -(CH 2 ) p -COR 9 or -(CH 2 ) q OH or, when R 3 and R 5 are hydrogen, R' 4 is additionally a radical of formula VI wherein Ri is as defined above for the case where n = 1 , R 6 and R 7 are each independently of the other phenylene or naphthylene each unsubstituted or substituted by d-dalkyl, R 8 is C r C 8 alkyl, / R 12 - 1 r+ R 9 is hydroxy, — O -jrM , Cι-Cι 8 alkoxy or — N \ R 13 Rio and R are each independently of the other hydrogen, CF 3 , d-Cι 2 alky! or phenyl, or R 10 and Rn, together with the carbon atom to which they are bonded, form a C 5 -C 8 cycloalkyl- idene ring unsubstituted or substituted by from 1 to 3 d-dalkyl groups; R i2 and R 13 are each independently of the other hydrogen or Cι-C 18 alkyl, Ru is hydrogen or Cι-Cι 8 alkyl, R 19 , R 20 , R 21 , R 22 and R 23 are each independently of the others hydrogen, fluorine, hydroxy, \ d-C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen, sulfur or by N r — R ; d-C 25 alkoxy; / C 2 -C 25 alkoxy interrupted by oxygen, sulfur or by N— R 8 ; d-C 25 alky,thio, C 7 -C 9 phenyl- alkyl, C 7 -C 9 phenylalkoxy, unsubstituted or C r C alkyl-substituted phenyl; unsubstituted or d-dalkyl-substituted phenoxy; unsubstituted or C r C 4 alkyl-substituted C 5 -C 8 cycloalkyl; unsubstituted or Cι-C 4 alkyl-substituted C 5 -C 8 cycloalkoxy; di(C C 4 alkyl)amino, C r C 25 - alkanoyl; C 3 -C 25 alkanoyl interrupted by oxygen, sulfur or by N— R 8 ; Cι-C 25 alkanoyloxy; C 3 -C 25 alkanoyloxy interrupted by oxygen, sulfur or by N— R 8 ; d-C 25 alkanoylamino, C 6 -C 9 cycloalkylcarbonyl, C 6 -C 9 cycloalkylcarbonyloxy, benzoyl or C r Cι 2 alkyl-substituted R 27 0 r' ii benzoyl; benzoyloxy or C Cι 2 alkyl-substituted benzoyloxy; — O — C — C — R 9 or R '2,8 I 29 | 30 — O — C — C-0- R 3? , I I H R 31 R 24 is hydrogen, d-C alkyl, or unsubstituted or C r C 4 alkyl-substituted phenyl, R 25 and R 26 are hydrogen, d-dalkyl or phenyl, with the proviso that at least one of the radicals R 25 and R 26 is hydrogen, R 27 and R 28 are each independently of the other hydrogen, C r C 4 alkyl or phenyl, R 29 is hydrogen or d-dalkyl, R 30 is hydrogen, unsubstituted or d-dalkyl-substituted phenyl; C r C 25 alkyl; C 2 -C 25 alkyl interrupted by oxygen, sulfur or by N— R 8 ; C 7 -C 9 phenylalkyl unsubstituted or substi¬ tuted on the phenyl radical by from 1 to 3 C r C 4 alkyl groups; or C 7 -C 25 phenylalkyl interrupted by oxygen, sulfur or by N— R 8 and unsubstituted or substituted on the phenyl radical by from 1 to 3 d-C 4 alkyl groups, R 3 ι is hydrogen or d-dalkyl, R 32 is hydrogen, Cι-C 25 alkanoyl; C 3 -C 25 alkanoyl interrupted by oxygen, sulfur or by \ N— R K ; C 2 -C 25 alkanoyl substituted by a di(d-C 6 alkyl) phosphonate group; C 6 -C 9 cyclo- / ' alkylcarbonyl, thenoyl, furoyl, benzoyl, or C r Cι 2 alkyl-substituted benzoyl; c C s H 2s — ~~ R 36 ~ R 37 R 33 is hydrogen or C r C 8 alkyl, R 3 is a direct bond, C r C 18 alkylene; C 2 -Cι 8 alkylene interrupted by oxygen, sulfur or by \ N— R ft ; C 2 -C 20 alkylidene, C 7 -C 20 phenylalkylidene, C 5 -C 8 cycloalkylene, C 7 -C 8 bicycloalky- / lene, unsubstituted or d-C 4 alkyl-substituted phenylene, / R 12 R 35 is hydroxy, - 1 r+ — O -JΓ M , C r Cι 8 aikoxy or — N \_ R 13 O R 36 is oxygen, -NH- or N _ C _ NH _ R , / R 37 is C r C 18 alkyl or phenyl, M is an r-valent metal cation, X is a direct bond, oxygen, sulfur or -NR -, n is 1 or 2, p isO, 1 or 2, qis 1,2, 3, 4, 5 or 6, r is 1, 2 or 3, and sisO, 1 or 2, with the proviso that when R 2 and R' 4 are hydrogen, methyl or tert-butyl or when R 3 and R' 4 , together with the carbon atom to which they are bonded, form a benzo ring, at least one of the radicals Rι 9 , R 20 , R 2 ι, R 22 and R 23 is other than hydrogen and R, is not unsubstituted naphthyl; with the proviso that when R 2 and R' 4 are hydrogen or d-dalkyl, Rι 9 and R 23 are other than hydroxy; and with the proviso that when R 2 and R' 4 are hydrogen, C Calkyl or methoxy, R 20 , R 21 and R 22 are other than methoxy.

Inventors: EVANS SAMUEL, NESVADBA PETER, TINKL MICHAEL, EVANS, SAMUEL, NESVADBA, PETER, TINKL, MICHAEL
Applicants: CIBA SC HOLDING AG, EVANS SAMUEL, NESVADBA PETER, TINKL MICHAEL, CIBA SPECIALTY CHEMICALS HOLDING INC., EVANS, SAMUEL, NESVADBA, PETER, TINKL, MICHAEL
Application year: 1999
Main classification: C07D307
IPC codes: C07B61, C07C49, C07D307