An Fe(III)-promoted oxidative annulation reaction was developed for the synthesis of 1,2-naphthoquinones. A variety of substituted arylglyoxals and internal alkynes undergo the transformation in the presence of FeCl₃ at room temperature to afford the 1,2-naphthoquinone products in good yields in a short reaction time. Interestingly, the products show unusual pseudomigration of the substituent on the arene ring of arylglyoxals. A possible mechanism involving Fe(III)-promoted formation of a vinyl cation from arylglyoxal and alkyne, electrophilic addition of the vinyl cation to the ipso carbon of the aryl group to give a spiral intermediate, and then migration of the keto carbon to the ortho carbon was proposed as key steps and verified using quantum mechanics.

中文翻译：

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铁对炔乙醛与炔烃的氧化环化反应的实验和理论研究：芳基环上异常的加成和迁移

开发了Fe（III）促进的氧化环化反应，用于合成1,2-萘醌。在室温下，在FeCl ₃存在下，各种取代的芳基乙二醛和内部炔烃进行转化，从而在较短的反应时间内以良好的收率得到1,2-萘醌产物。有趣的是，产物显示出芳基乙二醛的芳族环上的取代基的异常假迁移。可能的机制包括Fe（III）促进由芳基乙二醛和炔烃形成乙烯基阳离子，将乙烯基阳离子亲电加成到芳基的ipso碳上以形成螺旋中间体，然后将酮碳迁移到邻位碳被认为是关键步骤，并使用量子力学进行了验证。