Abstract
AbstractTreatment of pyridine‐stabilized silylene complexes [(η5‐C5Me4R)(CO)2(H)WSiH(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)2WSiH(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‐OSiH(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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