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Antipyrylsemisquaric chloride (9) has been prepared with excellent yield from antipyrylsemisquaric acid (8) and oxalic dichloride in the presence of dimethylformamide. Reaction of 9 with N and S nucleophiles afforded antipyrylsemisquaric acid derivatives, such as amides 12a - t, 14a - e, 15, hydrazides 18a - e, and thioesters 21a - i.

zeitschrift für naturforschung b

Oxokohlenstoffe und verwandte Verbindungen, 31 [1]. 3-Antipyryl-4-hydroxy-cyclobutendion (Antipyrylsemiquadratsäure) und seine Derivate / Oxocarbons and Related Compounds, 31 [1]. 3-Antipyryl-4-hydroxy-cyclobutenedione (Antipyrylsemisquaric Acid) and its Derivatives