Reaction of phosphines with the bimetallic unsaturated µ-alkylidene tungsten complex (1) proceeds via either substitution of one of the CO groups or nucleophilic attack at the γ-carbon on the unsaturated chain, as shown by the X-ray crystal structure of one of the resulting zwitterionic complexes.
J. Levisalles, F. Rose-Munch, H. Rudler, J. Daran, Y. Dromzee and Y. Jeannin, J. Chem. Soc., Chem. Commun., 1980, 685 DOI: 10.1039/C39800000685
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