Intramolecular allene–alkyne coupling reactions proceed in the presence of Fe(CO)4(NMe3) under photoirradiation conditions to provide various bicyclic dienones through η3-allyl iron complexes. Various 4-methylene-2-cyclopenten-1-ones could be prepared by intermolecular allene–alkyne coupling reaction under the same reaction conditions.
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Shibata et al. (1995) studied this question.
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