Methylene group transfer to carbon–metal multiple bonds: crystal structures of [TiW{µ-C(C 6 H 4 Me-4)[double bond, length half m-dash]CH 2 }(µ-CO)(CO)(η-C 5 H 5 ) 3 ] and [PtW{µ-C(C 6 H 4 Me-4)[double bond, length half m-dash]CH 2 }(CO) 2 (PMe 3 ) 2 (η-C 5 H 5 )]

In toluene–tetrahydrofuran, the reagent [(η-C5H5)2[graphic omitted]H2] reacts with [W(CR)(CO)2(η-C5H5)] or [TiW(µ-CR)(µ-CO)(CO)(η-C5H5)3](R = C6H4Me-4) to give [TiW(µ-CRCH2)(µ-CO)(CO)(η-C5H5)3], and with [PtW(µ-CR)(CO)2(PMe3)2(η-C5H5)] to yield [PtW(µ-CRCH2)(CO)2(PMe3)2(η-C5H5)]; the latter and [TiW(µ-CRCH2)(µ-CO)(CO)(η-C5H5)3] have been structurally characterised by X-ray diffraction.