Reactions of silamorpholinones and acylsilamorpholines with electrophilic reagents. X-ray structure of products including a pentacoordinated silicon compound
作者:Aleksandr G. Shipov、Evgeniya P. Kramarova、Elizaveta A. Mamaeva、Oksana A. Zamyshlyaeva、Vadim V. Negrebetsky、Yuri E. Ovchinnikov、Sergey A. Pogozhikh、Alan R. Bassindale*、Peter G. Taylor*、Yuri I. Baukov*
DOI:10.1016/s0022-328x(00)00821-4
日期:2001.2
opening of the sila- or disilacycle by cleavage of the Si–O bond with subsequent rearrangement to form five-membered chelate derivatives where the amide oxygen atoms coordinate with the silicon to form pentacoordinate silicon species. Multinuclear NMR spectroscopy and X-ray diffraction studies were used for structural investigation of the products. 4-Acyl-2,6-disilamorpholines initially form adducts with
2-sila-5-morpholinones,4-acyl-2-silamorpholines和4-acyl-2,6-disilamorpholines与亲电试剂的反应通常会导致Sia或二硅环的开环,这是由于Si-O键的断裂以及随后的开裂。重排形成五元螯合物衍生物,其中酰胺氧原子与硅配位形成五配位硅物种。多核NMR光谱和X射线衍射研究用于产物的结构研究。X射线晶体学表明,4-酰基-2,6-二硅吗啉最初与强酸形成加合物,其中酰胺氧被该酸质子化。