Carboxylation of anisole derivatives with CO and O2 catalyzed by Pd(OAc)2 and molybdovanadophosphates

Anisole and its homologues were carboxylated under the influence of CO and O-2 catalyzed by Pd(OAc)(2) combined with molybdovanadophosphates (HPMoV) under mild conditions to give the corresponding carboxylic acids in fair to good yields; for instance, anisole underwent the carboxylation under a mixed gas of CO (0.5 atm) and O-2 (0.5 atm) in the presence of Pd(OAc)(2) (5 mol%) and H(5)PMo(10)V(2)O(40)(.)nH(2)O (2 mol%) to form an isomeric mixture of anisic acids in good yield.