199438-70-5Relevant academic research and scientific papers
Reactions of tantalum alkylidene complexes with silanes. Synthesis and characterization of novel metallasilacyclodiene complexes and kinetic and mechanistic studies of their formation
Diminnie, Jonathan B.,Blanton, Jaime R.,Cai, Hu,Quisenberry, Keith T.,Xue, Ziling
, p. 1504 - 1514 (2008/10/08)
The reactions of tantalum alkylidene complexes (RCH2)3Ta(L)=CHR (1) and RCH2Ta(L)2[=CHR]2 (3) (R = SiMe3, L = PMe3) with phenylsilanes H2SiR′Ph (R′ = Me, Ph) and (PhSiH2)2CH2 were found to produce bis(silyl)-substituted alkylidene complexes (RCH2)3Ta=CR(SiHR′Ph) (4) and novel metallasilacyclobutadiene and metalladisilacyclohexadiene complexes. Reaction of the mixed-ligand trimethylsilylmethyl neopentylidene complex RCH2Ta(L)2[=CHBut]2 (6) with H2SiMePh also yielded a metallasilacyclobutadiene complex, but reaction of the neopenyl neopentylidene complex ButCH2Ta(L)2[=CHBut]2 (2) with H2SiMePh yielded unidentified products. Deuterium-labeling and kinetic studies of the conversion of 1 → 4 were found to be consistent with a dissociative mechanism. The structures of the novel metallacyclic complexes 5a, 5b, 7, and 8 were determined by X-ray crystallography.
