Phenylmalonylchloride reacts with sodium acetate in boiling benzene if possible via a dimeric phenylketenecarboxylic acid to give 4-acetoxy-3,6,7-triphenyl-3,6-cycloheptadiene-1,2,5-trion. The structure of this compound is deduced by mass spectrometry. Analogous compounds are obtained with the sodium salts of other carboxylic acids. A reaction mechanism is proposed.
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