Ethyne reacts with [Mo2(CO)4(η-C5Me5)2] under u.v. irradiation to yield [Mo2(CO)4(µ-η1,η2-CCH2)(η-C5Me5)2], containing vinylidene bound side-on to the dimolybdenum centre as a four-electron ligand; this new species undergoes thermal isomerisation to µ-ethyne, reacts with diazomethane to give µ-allene, and is step-wise protonated to afford µ-vinyl then µ-ethylidene.
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Journal of the Chemical Society, Chemical Communications
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