4-hydroxy-3 5-dialkylbenzyl-carboxylic esters as

摘要

esters of formula (I) are prepared by reacting Mannich bases (II) with carboxylic esters (III), in an anhydrous, inert organic solvent, in the presence of catalytic amounts of alkali or alkaline earth metal bases. CH2R3-COOR4 where R1 and R2 = alkyl groups, at least one alkyl group having 1-6 C atoms; R3 = CN or COOR4; and R4 = a straight chain, branched or cyclic or aryl-substituted alkyl-, thioether or ether group having a total of 1-20 C atoms; and R = a lower alkyl group.