Acyl iodides in organic synthesis: IX. Cleavage of the Si-O-C and Si-O-Si moieties
摘要:
Reactions of acyl iodides RCOI (R = Me, Ph) with organosilicon compounds involve cleavage of the Si-O-C and Si-O-Si fragments. Acetyl iodide reacts with alkyl(alkoxy)silanes with evolution of heat, and cleavage of the Si-O bond results in the formation of oligo-or polysiloxanes, alkyl iodides, and alkyl acetates. 1,3-Diacetoxytetramethyldisiloxane is formed in the reaction of acetyl iodide with dimethoxy(dimethyl)silane. Acyl iodides readily react with 1-ethoxysilatrane to give 1-acyloxysilatranes as a result of cleavage of the C-O bond. The reaction of acetyl iodide with hexaethyldisiloxane yields triethylsilyl acetate and triethyliodosilane, while in the reaction with octamethyltrisiloxane iodo(trimethyl)silane and dimethyl(trimethylsiloxy)silyl acetate are obtained.
A Conversion Series for Organosilicon Halides, Pseudohalides and Sulphides
作者:C. EABORN
DOI:10.1038/165685b0
日期:1950.4
RECENTLY organosilicon isocyanates and isothiocyanates have been prepared by interaction of the corresponding organochlorosilanes, RxSiCl(4–x), with silver cyanate and thiocyanate respectively1, and alkyl(iso ?)cyanosilanes have been prepared by interaction of alkyliodosilanes with silver cyanide2. It has now been found that by boiling triethylhalogenosilanes, triethylpseudohalogenosilanes, and he
Selective Catalytic Frustrated Lewis Pair Hydrogenation of CO
<sub>2</sub>
in the Presence of Silylhalides
作者:Tongtong Wang、Maotong Xu、Andrew R. Jupp、Zheng‐Wang Qu、Stefan Grimme、Douglas W. Stephan
DOI:10.1002/anie.202112233
日期:2021.12
The frustratedLewispair (FLP), 2,6-lutidine/ B(C6F5)3 mediates the catalytic reduction of CO2 using H2 and a silylhalide. Control of the silylhalide and solvent, affords selective avenues to the disilylacetal (R3SiOCH2OSiR3), methoxysilane (R3SiOCH3), methyliodide (CH3I) and methane (CH4) under mild conditions. The mechanism is studied by DFT and accounts for the observed selectivity.
Palladium-Catalyzed Cross-Coupling of Silyl Electrophiles with Alkylzinc Halides: A Silyl-Negishi Reaction
作者:Andrew P. Cinderella、Bojan Vulovic、Donald A. Watson
DOI:10.1021/jacs.7b04364
日期:2017.6.14
the first example of a silyl-Negishi reaction between secondary zinc organometallics and silicon electrophiles. This palladium-catalyzed process provides direct access to alkyl silanes. The delicate balance of steric and electronic parameters of the employed DrewPhos ligand is paramount to suppressing isomerization and promoting efficient and selective cross-coupling.
triethylsilane and I2. This system offers high regio- and stereoselectivity to afford (E)-vinyl iodides in good yields under mild conditions. Furthermore, the hydroiodination reaction shows high functional group tolerance toward alkyl, methoxy, halogen, trifluoromethyl, cyano, ester, halomethyl, acid-sensitive silyl ether, and acetal moieties.
在本文中,我们报道了使用HI内炔的有效且实用的碘氢化生成易地从容易获得的三乙基硅烷和我2。该系统具有高区域选择性和立体选择性,可在温和条件下以良好的收率提供 ( E )-乙烯基碘化物。此外,氢碘化反应显示出对烷基、甲氧基、卤素、三氟甲基、氰基、酯、卤代甲基、酸敏感性甲硅烷基醚和缩醛部分的高官能团耐受性。
Iridium-Catalyzed Reduction of Alkyl Halides by Triethylsilane
作者:Jian Yang、Maurice Brookhart
DOI:10.1021/ja075725i
日期:2007.10.1
A highly active cationicIr(III) hydridecomplex catalyzes the reduction of primary, secondary, and tertiary chlorides, bromides, and iodides as well as certain fluorides by Et3SiH. The catalytic cycle appears to operate by a unique process in which an electrophilic iridium silane complex acts as a silylating reagent to produce a silyl-substituted halonium ion which is then readily reduced by the nucleophilic