Mono-olefin Complexes of the Group VI Metal Carbonyls
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o-Allylphenyldiphenylphosphine, o-CH4CH.CH4-C[Formula omitted]H[Formula omitted]PPh[Formula omitted], reacts with Group VI metal di-olefin carbonyls to give stable, chelate complexes (ligand) M (CO)4 (M = Cr, Mo or W), in which the ligand has isomerised to o-propenylphenyldiphenylphosphine, o-CH3-CH:CH-C6H4-PPh2. These are the first mono-olefin complexes of the three Group VI metals. Infrared spectral measurements suggest that coordination of the double bond is strongest in the case of tungsten.
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Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences