Intramolecular Ullmanncouplingreaction of the diesters (6, 9), which were prepared by regioselective acylation of salicyl alcohol by using the two different substituted 2-iodobenzoyl chlorides, afforded the unsymmetrical diphenic acid derivatives (7, 10). Hydrogenolysis of the Ullmanncoupling product (7) afforded the monoester (12) in an excellent yield.