GB1235650A - Alkylhydroxythiolobenzoic acid esters and compositions stabilised thereby - Google Patents

Abstract

1,235,650. Alkylhydroxythiolobenzoic acid esters. J. R. GEIGY A.G. 29 April, 1970, No. 20698/70. Heading C2C. [Also in Division C3] The invention relates to alkylhydroxythiolobenzoic acid esters of the general formula in which P is 1 to 4, R 1 is an alkyl group having 1 to 5 carbon atoms, R 2 is an alpha-branched alkyl group having 3 to 8 carbon atoms and the sum of the carbon atoms of R 1 and R 2 are at most 10 and, R is an alkyl group having 1 to 22 carbon atoms, a thia-alkyl group having 2 to 20 carbon atoms, the benzyl group, an alkylbenzyl group having 8 to 15 carbon atoms, the phenyl group, an alkylphenyl group having 7 to 14 carbon atoms, the groups wherein y is 1 to 6 and A is an alkyl group having 1 to 18 carbon atoms, an alkylene group having 2 to 14 carbon atoms, an alkanetriyl group having 3 to 14 carbon atoms or an alkanetetrayl group having 4 to 14 carbon atoms. The compounds may be prepared by reacting a mercaptan of the formula R-[SH] p with an equivalent amount of a dialkyl-hydroxybenzoyl chloride preferably in the presence of an acid binding agent such as pyridine and optionally an inert solvent such as benzene, xylene, toluene, &c. Many examples are given including the reaction of 3,5 - ditertiarybutyl - 4 - hydroxybenzoyl chloride with trimethylol propane-tris-(mercapto propionate), ethylene glycol bis-(mercapto propionate), pentaerythritol tetrakis-(mercapto propionate), dodecyl mercaptan, and 4 tertiary butyl thiophenol.