Silyation de derives carbonyles α,β-acetyleniques. Synthese d'allenoxysilanes

摘要: Abstract In the presence of magnesium and in hexamethylphosphoric triamide (HMPT), trimethylchlorosilane reacts with α,β-acetylenic ketones to give most cases 1,4 addition two trimethylsilyl groups conjugated system: allenoxysilanes, which constitute a new class organometallic compounds, are formed. These upon hydrolysis corresponding silylated α,β-ethylenic ketones. Other reactions also take place: complete reduction carbonyl group giving polysilylated allenes; reductive duplication accompanied by O-silylation, enolization. α,β-Acetylenic aldehydes same type reactions.