title: eta1:eta2-Alkynyl-bridged W-Si complexes: formation, structure, and reaction with acetone.
abstract: Reactions of (eta5-C5Me4R)(CO)2(MeCN)WMe (R = Me, Et) with HPh2SiCCtBu gave the novel alkynyl-bridged W-Si complexes, (eta5-C5Me4R)(CO)2W(mu-eta1:eta2-CCtBu)(SiPh2) (R = Me, Et), whose alkynyl ligands bridge the tungsten and silicon atoms in an eta1:eta2-coordination mode. The structures of these complexes were fully characterized, including X-ray crystallography. Treatment of (eta5-C5Me5)(CO)2W(mu-eta1:eta2-CCtBu)(SiPh2) with acetone resulted in acetone insertion into the silicon-alkynyl linkage followed by intramolecular C-H activation of the tBu group to give the chelate-type alkyl-alkene complex, (eta5-C5Me5)(CO)2W(eta1:eta2-CH2CMe2C=CHSiPh2OCMe2).
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai, Japan. sakaba@funorg.chem.tohoku.ac.jp
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Sakaba
authors.forename: Mako
authors.initials: M
authors.lastname: Yoshida
authors.forename: Chizuko
authors.initials: C
authors.lastname: Kabuto
authors.forename: Kuninobu
authors.initials: K
authors.lastname: Kabuto