Siliciumverbindungen mit starken intramolekularen sterischen wechselwirkungen
摘要:
Treatment of chlorobis(2,4,6-triisopropylphenyl)silane (Ar2SiHCl) with lithium naphthalenide and subsequent,addition of the chlorosilanes R2SiHCl (R =(i)Pr, (t)Bu, Mes) gives the unsymmetrical disilanes R2HSiSiHAr2 which are smoothly converted into the 1,2-dichlorodisilanes 8-10. The X-ray structure analysis of the 1,1-dimesityldisilane 10 reveals a staggered conformation with the chlorine atoms disposed in an anti orientation. Whilst the reductive chloride elimination from the 1,1-dialkyldichlorodisilanes 8 and 9 did not give the corresponding disilenes, the same reaction of 10 provided bright yellow crystals of 1,1-dimesityl-2,2-bis(2,4,6-triisopropylphenyl)disilene, the structure of which was confirmed by a complete NMR study.
Linear 2,2-diaryl-substituted trisilanes: Structure and photolysis to disilenes
作者:R.Scott Archibald、Yvar van den Winkel、Douglas R. Powell、Robert West
DOI:10.1016/0022-328x(93)80035-a
日期:1993.3
Synthesis of the new disilene, E/Z-IsMesSi=SiIsMes (1) is reported; the isomer Is2Si=SiMes2 (2) was obtained by photolysis of a mixture of Mes2Si(SiMe3)2 (3) and Is2Si(SiMe3)2 (5). Isomerization of 1 half arrow right over half arrow left 2 does not take place up to 80-degrees-C. X-Ray crystal structures are reported for trisilanes 3, IsMesSi(SiMe3)2 (4), and 5.