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The wizard of Os: Regioselective osmium-catalyzed 7-endo heterocyclization of aromatic alkynols affords benzoxepines in good yields. The proposed catalytic cycle involves the key formation of osmium–vinylidene complexes via an alkynyl-hydride–osmium(IV) complex from the starting alkynol.
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Varela‐Fernández et al. (2010) studied this question.
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