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Nucleophilic addition of the acyl anion of (I) ‐ generated by reaction with thiazolium salts ‐ to the butenone (II) yields the arylpentadiones (III).

A series of novel azetidinones bearing the methoxycarbonylmethylene, thioethoxycarbonylmethylene, and alkylaminocarbonylmethylene side chain in their three position have been synthesized from the reaction of the potassium salt of 4,4′-bis(thioethoxy)-3-butenoic acid with a number of Schiff bases.