The Ullmann coupling of 2-halo esters, 1, to dialkyl diphenates, 2, has often been effe~ ted.~ In general the reaction has been carried out by long heating with copper at temperatures over 200". We wished to find out if this type of reaction could be carried out under milder conditions than usual by changing the reaction from an intermolecular to an intramolecular type. In one case tried here earlier the synthesis of 6, 6'-diethyldiphenic acid was markedly ...
