Saturday, 25 July 2015

organic chemistry - Symmetry forbidden cycloaddition in the Wittig reaction?


My textbook (Klein) describes the mechanism for the Wittig reaction as a [2+2] cycloaddition, followed by a collapse of the ring.


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As far as I'm aware, [2+2] cycloadditions are symmetry forbidden, unless the reaction is light-initiated, which the text does not mention. Is the book wrong? If not, what is going on here?




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