Silicon in Synthesis. 10. The (Trimethylsilyl)allyl Anion: A .beta.-Acyl Anion Equivalent for the Conversion of Aldehydes and Ketones into .gamma.-Lactones
Silicon in Synthesis. 10. The (Trimethylsilyl)allyl Anion: A .beta.-Acyl Anion Equivalent for the Conversion of Aldehydes and Ketones into .gamma.-Lactones
hydrogen abstraction reactionsbetween benzophenones and allylic silanes have been investigated. The high regioselective oxetane formations were explained in terms of an additional stability due to the σSi–C–pπ hyperconjugation of β-silyl radicals in diradical intermediates. Allylradical substituted by a trimethylsilyl group, which was generated from a hydrogen abstraction reaction, recombined with benzophenone