Silylated Cyclohexadienes as New Radical Chain Reducing Reagents: Preparative and Mechanistic Aspects
作者:Armido Studer、Stephan Amrein、Florian Schleth、Tobias Schulte、John C. Walton
DOI:10.1021/ja0341743
日期:2003.5.1
superior tin hydride substitutes for the conduction of various radical chain reductions. Debrominations, deiodinations, and deselenations can be performed using these environmentally benign reagents. Furthermore, Barton-McCombie-type deoxygenations using silylated cyclohexadienes are described. Radical cyclizations, ring expansions, and Giese-type addition reactions with the new tin hydride substitutes
alkenes/alkynes and ketones/ketimines, respectively. The net transformation is a transfer hydrosilylation, and the effect that the substitution pattern of the cyclohexa-1,4-diene core and the subsituents at the silicon atom exert on these hydrosilane surrogates is systematically investigated. The results are compared with those obtained employing the hydrosilane directly. Another part of this comprehensive
Salt-Free Preparation of Trimethylsilyl Ethers by B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Transfer Silylation by Using a Me<sub>3</sub>SiH Surrogate
promoted by the same boron catalyst. Benzene and dihydrogen are formed during the reaction, but no salt waste is. This expedient protocol is applicable to several silicon groups, and the preparation of trimethylsilylethers presented here is potentially useful for alcohol derivatization prior to GLC analysis.
3-Silylated Cyclohexa-1,4-dienes as Precursors for Gaseous Hydrosilanes: The B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Transfer Hydrosilylation of Alkenes
作者:Antoine Simonneau、Martin Oestreich
DOI:10.1002/anie.201305584
日期:2013.11.4
Set Me3SiH free! The strong Lewis acid B(C6F5)3catalyzes the release of hydrosilanes from 3‐silylated cyclohexa‐1,4‐dienes with concomitant formation of benzene. Subsequent B(C6F5)3‐catalyzed SiH bond activation allows for alkene hydrosilylation (see scheme). The net reaction is an ionic transfer hydrosilylation. The new technique is particularly attractive in the case of otherwise gaseous, highly
免费给我3 SiH!强路易斯酸B(C 6 F 5)3催化3-硅烷化的环己-1,4-二烯的氢化硅烷的释放,并伴随有苯的形成。随后的B(C 6 F 5)3催化的SiH键活化可实现烯烃的氢化硅烷化(参见方案)。净反应是离子转移氢化硅烷化。在其他气态,高度易燃的氢化硅烷的情况下,新技术特别有吸引力。
[EN] USE OF CYCLOHEXA-2,5-DIEN-1-YL-SILANES AS PRECURSORS FOR GASEOUS HYDROSILANES<br/>[FR] UTILISATION DE CYCLOHEXA-2,5-DIÉN-1-YLSILANES EN TANT QUE PRÉCURSEURS POUR DES HYDROSILANES GAZEUX
申请人:TECH UNIVERSITÄT BERLIN
公开号:WO2015036309A1
公开(公告)日:2015-03-19
The invention relates to the use of cyclohexa-2,5-dien-1 -yl-silanes of general formula (I), for generation of hydrosilanes in solution using a strong Lewis acid. This way, e.g., alkenes or carbonyl compounds can be hydrosilylated in good yields using the cyclohexa-2,5-dien-1 - yl-silanes of general formula I as transfer hydros! lylating agents in the presence of a strong Lewis acid as catalyst with concomitant formation of an arene solvent.