Chemistry of di-and tri-metal complexes with bridging carbene or carbyne ligands. Part 37. 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 )]

The compounds [W(CR)(CO)2(η-C5H5)](R = C6H4Me-4 or Me) and [[graphic omitted]H2}(η-C5H5)2] react in toluene, in the presence of tetrahydrofuran, to afford the bridged vinyl complexes [TiW{µ-C(R)CH2}(µ-CO)(CO)(η-C5H5)3]. The compound with R = C6H4Me-4 may also be prepared by treating [TiW(µ-CC6H4Me-4)(µ-CO)(CO)(µ-C5H5)3] with the titanium reagent. It has been structurally characterised by X-ray diffraction. The Ti–W bond [3.082(2)Å] is spanned …