Stabilization of a Silaaldehyde by its η2 Coordination to Tungsten

• DOI: 10.1002/anie.201507956
• Publication Date: 2015-11-24T12:32:40Z
• Authors: Tetsuya Fukuda; Hisako Hashimoto; Shigeyoshi Sakaki; Hiromi Tobita
• Keywords: Silylene

Abstract Treatment of pyridine‐stabilized silylene complexes [(η 5 ‐C Me 4 R)(CO) 2 (H)WSiH(py)(Tsi)] (R=Me, Et; py=pyridine; Tsi=C(SiMe 3 ) with an N‐heterocyclic carbene I i Pr (1,3‐diisopropyl‐4,5‐dimethylimidazol‐2‐ylidene) caused deprotonation to afford anionic WSiH(Tsi)][H Pr] (R=Me ( 1‐Me ); R=Et 1‐Et )). Subsequent oxidation and pyridine‐ N ‐oxide (1 equiv) gave η ‐silaaldehydetungsten W{η ‐OSiH(Tsi)}][H 2‐Me 2‐Et The formation unprecedented W‐Si‐O three‐membered ring was confirmed by X‐ray crystal structure analysis.