title: Phosphido-bridged Ta/Rh bimetallic complex: synthesis, structure, and catalytic hydrosilylation of acetophenone.
abstract: Reaction of Cp2TaH3 (1) with ClPEt2 gives the insertion product [Cp2TaH2(PHEt2)]Cl (5), which upon deprotonation with LiN(SiMe3)2 affords the phosphido complex Cp2TaH2(PEt2) (6) as the kinetic product. The latter transforms by a first-order reaction during the course of 3.5 days to the phosphine complex Cp2TaH(PHEt2) (7). Repetition of this insertion/deprotonation sequence gives the compounds [Cp2Ta(PHEt2)2]Cl (8) and Cp2Ta(PEt2)(PHEt2) (9). Reaction of the latter with 0.5[(μ-Cl)Rh(η2-C2H4)]2 in the presence of LiN(SiMe3)2 gives the bimetallic complex Cp2Ta(μ-PEt2)2Rh(η2-C2H4) (10), which was studied by NMR and X-ray diffraction analysis. Complex 10 catalyses the hydrosilylation of acetophenone by PhMeSiH2.
authors.affiliation: Chemistry Department, Brock University, 500 Glenridge Ave., St. Catharines, L2S 3A1, ON, Canada.
authors.forename: Andrea E
authors.initials: AE
authors.lastname: Findlay
authors.forename: Somying
authors.initials: S
authors.lastname: Leelasubcharoen
authors.forename: Lyudmila G
authors.initials: LG
authors.lastname: Kuzmina
authors.forename: Judith A K
authors.initials: JA
authors.lastname: Howard
authors.forename: Georgii I
authors.initials: GI
authors.lastname: Nikonov