Uebergangsmetall-Silyl-Komplexe. XXXVIII. Darstellung Phosphan-substituierter Hydrido-Silyl-Komplexe des Chrom, Molybdaen und Wolfram, (CO)5-n(R'3P)nM(H)SiR3 (n = 2, 3) und Bildung der Hydrido-Chloro-Komplexe (CO)3(L-L)M(H)Cl durch Umsetzung von (CO)3(L-L)M(NCR') mit HSiClR2 <L-L = .

Article abstract of DOI:10.1016/0022-328X(91)83037-5

At least two phosphorus atoms at the metal (n<*>2) are necessary to obtain stable hydrido-silyl complexes of the type (CO)5-n(R'3P)nM(H)SiR3 (M = Cr, Mo, W).The complexes (CO)3(dppe)M(H)SiR3 and (CO)2(tdppme)M(H)SiR3 are obtained either by photochemical reaction of (CO)4(dppe)M or (CO)3(tdppme)M, or by thermal reaction of (CO)4(dppe)M(THF) with silanes HSiR3.Reaction of the isonitrile complexes (CO)3(L-L)M(NCR') (M = Mo, W; L-L = tmeda, bipy, dppe, (PPh3)2) with silanes HSiR2Cl does not yield hydrido-silyl complexes, but instead the hydrido-chloro complexes (CO)3(L-L)M(H)Cl.The latter complexes were also prepared by reaction of (CO)3(L-L)M(NCR') with HCl for comparison.The molecular structure of (CO)3(dppe)W(H)Cl was determined by an X-ray structure analysis.The complex has a capped-octahedral geometry with a facial arrangement of the three CO ligands and the hydride ligand above the triangular face formed by the two phosphorus atoms and a CO ligand.