Author/Authors :
Aleksandr G. Shipov، نويسنده , , Evgeniya P. Kramarova، نويسنده , , Elizaveta A. Mamaeva، نويسنده , , Oksana A. Zamyshlyaeva، نويسنده , , Vadim V. Negrebetsky، نويسنده , , Yuri E. Ovchinnikov، نويسنده , , Sergey A. Pogozhikh، نويسنده , , Alan R. Bassindale، نويسنده , , PETER G. TAYLOR، نويسنده , , Yuri I. Baukov، نويسنده ,
Abstract :
Reactions of 2-sila-5-morpholinones, 4-acyl-2-silamorpholines and 4-acyl-2,6-disilamorpholines with electrophilic reagents generally lead to the 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 strong acids where the amide oxygen is protonated by the acid as demonstrated by X-ray crystallography.
