Stabilization of a Silaaldehyde by its η2 Coordination to Tungsten |
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| Authors: | Dr. Tetsuya Fukuda Dr. Hisako Hashimoto Prof. Dr. Shigeyoshi Sakaki Prof. Dr. Hiromi Tobita |
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| Affiliation: | 1. Department of Chemistry, Graduate School of Science, Tohoku University, Aoba‐ku, Sendai 980–8578 (Japan);2. Institute for Integrated Cell‐Material Science (iCeMS), Kyoto University, Kyoto 606–8501 (Japan) |
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| Abstract: | Treatment of pyridine‐stabilized silylene complexes [(η5‐C5Me4R)(CO)2(H)W?SiH(py)(Tsi)] (R=Me, Et; py=pyridine; Tsi=C(SiMe3)3) with an N‐heterocyclic carbene MeIiPr (1,3‐diisopropyl‐4,5‐dimethylimidazol‐2‐ylidene) caused deprotonation to afford anionic silylene complexes [(η5‐C5Me4R)(CO)2W?SiH(Tsi)][HMeIiPr] (R=Me ( 1‐Me ); R=Et ( 1‐Et )). Subsequent oxidation of 1‐Me and 1‐Et with pyridine‐N‐oxide (1 equiv) gave anionic η2‐silaaldehydetungsten complexes [(η5‐C5Me4R)(CO)2W{η2‐O?SiH(Tsi)}][HMeIiPr] (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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| Keywords: | metallacycles silaaldehydes silanones silicon tungsten |
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