2-氯乙醛缩二甲醇 、 1,4-丁二醇 、 L-青霉胺 在
氮气 、 dimethylsilylene 作用下,
以
甲醇 为溶剂,
以The product 2-chloromethyl-1,3-dioxepane was isolated from the crude mixture by fractional distillation in an Oldershaw column under partial vacuum的产率得到2-Chloromethyl-1,3-dioxepane
Thermal decomposition of tetramethylsilane and tetramethylgermane by flash pyrolysis vacuum ultraviolet photoionization time-of-flight mass spectrometry
作者:Jessy M. Lemieux、Jingsong Zhang
DOI:10.1016/j.ijms.2014.09.006
日期:2014.11
process in TMS involving loss of H atom from Si(CH 3 ) 3 followed by elimination of H2 to form SiC 3 H 8 , SiC 3 H 6 , and SiC 3 H 4 was also identified. Sequential loss of the third and fourth methyl radical with significant formation of Ge and Ge 2 was observed in the TMG pyrolysis. Loss of a third methyl radical in the TMS pyrolysis was not significant, while Si and SiC products were possibly produced
摘要 使用快速热解真空紫外单光子电离飞行时间质谱 (VUV-SPI-TOFMS) 在 20-100 μs 的短时间尺度上研究了四甲基硅烷 (TMS) 和四甲基锗烷 (TMG) 的热分解。TMS 和 TMG 的初级分解通过失去甲基自由基而发生,分别形成 Si(CH 3 ) 3 和 Ge(CH 3 ) 3 。Si(CH 3 ) 3 和Ge(CH 3 ) 3 自由基都经历了第二个甲基自由基的二次损失,分别形成:Si(CH 3 ) 2 和:Ge(CH 3 ) 2 。之前未观察到的 TMS 二次分解过程包括从 Si(CH 3 ) 3 失去 H 原子,然后消除 H 2 以形成 SiC 3 H 8 、SiC 3 H 6 和 SiC 3 H 4 。在 TMG 热解中观察到第三个和第四个甲基自由基的连续损失以及 Ge 和 Ge 2 的显着形成。TMS 热解中第三个甲基自由基的损失并不显着,而可能会产生 Si
Decomposition of 1,1-dimethyl-1-silacyclobutane on a tungsten filament-evidence of both ring CC and ring SiC bond cleavages
作者:L. Tong、Y. J. Shi
DOI:10.1002/jms.1712
日期:2010.2
W filament to form ethene and 1,1‐dimethylsilene is a catalytic process. In addition, two other decomposition channels exist to produce methylradicals via the SiCH3 bond cleavage and to form propene (or cyclopropane)/dimethylsilylene. It has been demonstrated that both the formation of ethene and that of propene are stepwise processes initiated by the cleavage of a ring CC bond and a ring SiC bond
Gas-phase photochemical reactions of dodecamethylcyclohexasilane with silicon compounds. kinetics of some insertion reactions of dimethylsilylene
作者:Iain M.T. Davidson、Naaman A. Ostah
DOI:10.1016/s0022-328x(00)83467-1
日期:1981.2
Attempts to measure the kinetics of gas-phase insertionreactions of dimethylsilylene, generated by photolysis of dodecamethylcyclohexasilane, are described. Insertion of dimethylsilylene into silicon—hydrogen bonds was the main reaction with trimethylsilane, pentamethyldisilane, and sym-tetramethyldisilane; in all cases the activation energy for insertion was zero, and the rate constants were in the
Time-resolved studies of the temperature dependence of the gas-phase reactions of methylsilylene with silane and the methylsilanes
作者:Rosa Becerra、H. Monty Frey、Ben P. Mason、Robin Walsh
DOI:10.1039/ft9938900411
日期:——
initio theory (for the reaction of SiH2 with SiH4) these show that the electrophilic interaction probably precedes the nucleophilic interaction, although the latter is important in the rate-determining (second) step for the insertion reactions of both MeSiH and SiMe2. Combination of MeSiH insertion rate constants with the reverse unimolecular decomposition rate constants of the product disilanes enable the