Recent advances in generation and cycloaddition reactions of transition metal-containing benzopyrylium and related zwitterionic intermediates from o-alkynylphenylcarbonyl or imine derivatives are summarized focussing on the difference of the two reaction pathways, that is, [3 + 2] and [4 + 2] cycloaddition reactions.
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Kusama et al. (2006) studied this question.
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