Patent ID: 6268505
Filing Date: 2001-07-31
Classification: C07D,C08K

Abstract:
A process for the preparation of 2-(2'-hydroxyphenyl)benzotriazoles of formula (I), ##STR19##wherein R represents an ester group of formula (II), (III) or (IV), or an amide group of formula (V), ##STR20##wherein X represents a hydrogen atom; a halogen atom selected from chlorine or bromine; a linear or branched C.sub.1 -C.sub.18 alkyl group; a linear or branched C.sub.1 -C.sub.18 alkoxy group; or a cyano group;R.sub.1 represents a hydrogen atom; a linear or branched C.sub.1 -C.sub.18 alkyl group; a linear or branched C.sub.2 -C.sub.18 alkenyl group; a linear or branched C.sub.2 -C.sub.18 alkinyl group; a C.sub.5 -C.sub.18 cycloalkyl group, said cycloalkyl optionally substituted; a C.sub.7 -C.sub.15 aralkyl or C.sub.7 -C.sub.15 alkylaryl group; a C.sub.6 -C.sub.14 aryl group, said aryl group optionally substituted; an acyl group of formula (VII): ##STR21##or an ester group of formula (VIII): ##STR22##wherein R' represents a linear or branched C.sub.1 -C.sub.18 alkyl group; a linear or branched C.sub.2 -C.sub.18 alkenyl group; a linear or branched C.sub.2 -C.sub.18 alkinyl group; a C.sub.5 -C.sub.18 cycloalkyl group, said cycloalkyl group optionally substituted; a C.sub.7 -C.sub.15 arylalkyl or C.sub.7 -C.sub.15 alkylaryl group; a C.sub.6 -C.sub.14 aryl group, said aryl group optionally substituted; a linear or branched C.sub.1 -C.sub.18 alkoxy group;wherein the substituents of said optionally substituted C.sub.5 -C.sub.18 cycloalkyl group and C.sub.6 -C.sub.14 aryl groups are halogen atoms selected from chlorine or bromine, linear or branched C.sub.1 -C.sub.18 alkyl groups, linear or branched C.sub.2 -C.sub.18 alkenyl groups; linear or branched C.sub.2 -C.sub.18 alkinyl groups, OH groups, NH groups or SH groups;R.sub.2 and R.sub.3, the same or different, represent a hydrogen atom; a linear or branched C.sub.1 -C.sub.18 alkyl group; or a phenyl group;which comprises reacting a 2-(2'-hydroxyphenyl) benzotriazole of formula (IX): ##STR23##wherein X has the meaning as described above, with 2,4-imidazolidione-1,3-dimethylol of formula (X) or with 2,4-imidazolidinediene-1-methylol of formula (Xa) ##STR24## ##STR25##wherein R.sub.2 and R.sub.3 have the same meanings as described above,in the presence of toluene and p-toluenesulfonic acid as catalyst, at a temperature ranging from room temperature to the boiling point of the toluene.