Abstract:The concerted mechanism of thermal BBr 3 -mediated [2 + 2] carbonyl-olefin cycloaddition is intriguing considering the conflict against the Woodward-Hoffmann rule. In this work, we report a mechanistic study of the titled reaction using density functional theory calculations. The concerted [2 + 2] cycloaddition mechanism is operative even for the truncated model system of 2-methyl-2-butene and butanone.Intrinsic reaction coordinate analysis and potential surface mapping showed the asynchronous nature of the ap… Show more
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