Phosgene reacts with 2,6-dimethyl-4H-pyran-4-one at room temperature to yield 2,6-bis(4′-chloro-2′,6′-dimethylphenyl)-4H-pyran-4-one (I), and 2-(4′-chloro-2′,6′-dimethylphenyl)-6-methyl-4H-pyran-4-one (II). The structure assignment and the mechanism of formation is discussed. Some 4H-ylidene derivatives of I and II were prepared.

中文翻译：

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光气与2,6-二甲基-4H-吡喃-4-酮的反应

光气在室温下与2,6-二甲基-4H-吡喃-4-酮反应生成2,6-双（4'-氯-2'，6'-二甲基苯基）-4H-吡喃-4-酮（I ）和2-（4'-氯-2'，6'-二甲基苯基）-6-甲基-4H-吡喃-4-酮（II）。讨论了结构分配和形成机理。制备了一些I和II的4H-亚烷基衍生物。