Synthesis and characterization of mono-, bis-, tris- and tetrakis(trimethylsilylmethyl)silanes: (Me3SiCH2)xSiH4−x (x = 1−4)
摘要:
The mono-, bis-, tris-, and tetrakis(trimethylsilylmethyl)silanes, (Me3SiCH2)(x)SiH4-x (x = 1-4), have been prepared for use as "models" of the various Si-centered functional units in a complex, highly branched polycarbosilane polymer of the approximate composition, "(SiH2CH2)n". These compounds have been characterized by GC, IR, H-1, C-13, Si-29 NMR, MS, and elemental analysis. The IR and NMR data for this series of compounds show distinct trends on increasing substitution, which are related to the structural differences within the series.
General Synthesis of Trialkyl- and Dialkylarylsilylboranes: Versatile Silicon Nucleophiles in Organic Synthesis
作者:Ryosuke Shishido、Minami Uesugi、Rikuro Takahashi、Tsuyoshi Mita、Tatsuo Ishiyama、Koji Kubota、Hajime Ito
DOI:10.1021/jacs.0c03011
日期:2020.8.19
nucleophiles in organic transformations, which significantly expands the scope of synthetically accessible organosilicon compounds compared to previously reported methods. Thus, the present study can be expected to inspire the development of efficient methods for novel silicon-containing bioactive molecules and organic materials with desirable properties. We also report the first 11B1H} and 29Si1H} NMR spectroscopic
Rates of hydrideabstractions from j3-silyl-, j3-germyl-, and B-stannyl-substituted silanes (HSiMeZ(CHz- MMe3), M = Si, Ge, Sn) and related compounds by diarylcarbenium ions have been measured. The intermediate silicenium ions, produced in the rate-determining step, are stabilized by hyperconjugation, but the effects are much smaller than in comparable carbenium ions. ~~ ~~ ~~