| abstract |
The present invention relates to a new process for the preparation of known dimeric aromatic acyl cyanides of the general formula in which Ar represents optionally substituted phenyl, naphthyl or hetaryl, which is characterized in that acid halides of the general formula Ar-CO-Hal (II) wherein Ar has the meaning given above and Hal represents fluorine, chlorine or bromine, with alkali metal cyanides in a two-phase system consisting of water and an aliphatic ketone which is immiscible or only miscible with water, and in the presence of a phase transfer catalyst. |