Co-Complexes Derived from Alkene Insertion to Alkyne-Dicobaltpentacarbonyl Complexes: Insight into the Regioselectivity of Pauson-Khand Reactions of Cyclopropenes.

[摘要]：Described are the x-ray crystallog. and spectral properties of Co-complexes that were isolated from two Pauson-Khand reactions of chiral cyclopropenes. These are the 1st examples of isolated Co-complexes derived from the putative alkene-insertion intermediates of Pauson-Khand reactions. The binuclear Co-complexes are coordinated to m-bonded, five-C flyover carbene ligands. It is proposed that the complexes result from cyclopropane fragmentation subsequent to alkene insertion. The observation of these metal complexes provides a rationale for the origin of regioselectivity in Pauson-Khand reactions of cyclopropenes.

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