Hypervalent Silicon Compounds

Abstract

Introduction Pentacoordinate Anionic Silicon Compounds Pentacoordinate Neutral Silicon Complexes Cationic Pentacoordinate Complexes Hexacoordinate Ionic Silicon Compounds Neutral Hexacoordinate Silicon Complexes Complexes with Higher Coordination Numbers Addendum

Silatranes and Their Tricyclic Analogs

“…High-field shifts of 1 2.5 ppm were observed for the 3-Me, 3-ClCH 2 , 3-Vinyl and 3-Ph substituted silatranes 57,238,262 but downfield shifts of 2.7 ppm were found for the 3-CF 3 derivatives 57 . In the spectra of diastereomeric 3,7-dimethyl-and 3,7,10-trimethylsilatranes, symmetric isomers show more shielded signals than asymmetric isomers 238 , due to a stronger transannular bonding in the former isomers.…”

“…That is why the latter effects were proposed to be used for a fast estimation of the related strength of the Si N bond within a series of these compounds 261 . Despite its simplicity, this method proved to be rather reliable and after some modifications it was successfully applied to numerous (N Si) and (O Si)chelate compounds 28,165,262 .…”