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Updated: Mar 27, 2026

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
Stabilization of a Silaaldehyde by its η(2) Coordination to Tungsten
Tetsuya Fukuda1, Hisako Hashimoto2, Shigeyoshi Sakaki3
1Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578 (Japan).
Abstract:
Treatment of pyridine-stabilized silylene complexes [(η(5)-C5 Me4R)(CO)2(H)W=SiH(py)(Tsi)] (R = Me, Et; py = pyridine; Tsi = C(SiMe3)3) with an N-heterocyclic carbene (Me)I(i)Pr (1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene) caused deprotonation to afford anionic silylene complexes [(η(5)-C5Me4 R)(CO)2W=SiH(Tsi)][H(Me)I(i)Pr] (R = Me (1-Me); R = Et (1-Et)). Subsequent oxidation of 1-Me and 1-Et with pyridine-N-oxide (1 equiv) gave anionic η(2)-silaaldehydetungsten complexes [(η(5)-C5Me4R)(CO)2W{η(2)-O=SiH(Tsi)}][H(Me)I(i)Pr] (R = Me (2-Me); R = Et (2-Et)). The formation of an unprecedented W-Si-O three-membered ring was confirmed by X-ray crystal structure analysis.
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