Summary 1. The biaryl synthesis involving the action of reducing agents on aqueous solutions of diazotized amines has been applied to the synthesis of resolvable diphenic acids. The method constitutes a rapid and direct synthesis of these substances. 2. d, l-4, 6, 4', 6'-Tetrachlorodiphenic acid and the analogous tetrabromodiphenic acid have been prepared by this method in one step from the appropriate 3, 5-dihalogeno-2- ...
