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On heating, bis(cyclopentadienyl)tetracarbonyldimolybdenum-alkyne complexes undergo a [2 + 2 + 1] cycloaddition with norbornadiene or norbornene to afford the corresponding-3 substituted cyclopentenone derivatives, which could heardly be obtained in the cobalt-complexed alkyne-mediated Pauson-Khand reaction.
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Mukai et al. (1992) studied this question.
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