Patent ID: 6740765
Filing Date: 2004-05-25
Classification: C07C

Abstract:
A process for preparing a compound of formula (I) whereR is halo, C1-6alkyl, C1-6alkyl substituted with 1 to 4 halogens, C1-6 alkoxy, C1-6alkenyl, â€”Oâ€”(CH2)mcycloalkyl of 3-6 carbons; n is 1-5; m is 0-6; and one of Râ€² or Râ€³ is hydrogen and the other is CO(O)X where X is hydrogen or C1-6alkyl which process comprises decarboxylating the diacid or diester of Formula (A) where each R1 is hydrogen or C1-6alkyl-ester forming group of 1-6 carbon atoms and R and n are the same as for Formula (I) by treating the diacid or diester with about 1 equivalent of a base, about 3 equivalents of water and about 3 equivalents of an alkali salt in a suitable solvent and heated to between about 100 to 150Â° C. for about 4-8 hours.