Syntheses, Structures, and Reactivities of Novel Silacyclic Systems: the First Stable Silabenzene and Silacyclopropabenzene

Abstract

The first stable silabenzene and silacyclopropabenzenes were synthesized by taking advantage of an efficient steric protection group, 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt). The molecular geometries of these novel conjugated ring systems containing a silicon atom were definitively determined by X-ray crystallographic analysis. Their spectral data such as ¹H, ¹³C, and ²⁹Si NMR, FT-Raman, and UV-vis spectra and the theoretical calculations revealed their unique properties.

Keywords::

• silabenzene
• silacyclopropabenzene
• bis(silacyclopropa)-benzene
• steric protection
• X-ray structural analysis