Reversible Silylium Transfer between P‐H and Si‐H Donors
作者:Roman G. Belli、Dimitrios A. Pantazis、Robert McDonald、Lisa Rosenberg
DOI:10.1002/anie.202011372
日期:2021.2
The Mo=PR2 π* orbital in a Mo phosphenium complex acts as acceptor in a new PIII‐based Lewis superacid. This Lewisacid (LA) participates in electrophilic Si‐H abstraction from E3SiH to give a Mo‐bound secondary phosphine ligand, Mo‐PR2H. The resulting Et3Si+ ion remains associated with the Mo complex, stabilized by η1‐P‐H donation, yet undergoes rapid exchange with an η1‐Si‐H adduct of free silane in
IrIII metallacycle rapidly and selectively catalyses the reduction of various esters, carboxylic acids, ketones, and aldehydes. The reactions proceed in high yields at room temperature by hydrosilylation followed by desilylation. Depending on the substrate, esters are reduced to alcohols or ethers and carboxylic acids to alcohols or aldehydes.
InCl<sub>3</sub>/Me<sub>3</sub>SiBr-Catalyzed Direct Coupling between Silyl Ethers and Enol Acetates
作者:Yoshiharu Onishi、Yoshihiro Nishimoto、Makoto Yasuda、Akio Baba
DOI:10.1021/ol200875m
日期:2011.5.20
A combined Lewis acid catalyst of InCl3 and Me3SiBr promoted the direct use of enol acetates in the coupling with low-reactive silyl ethers, in which functional groups including ketones and aldehydes survived. Sterically hindered silyl ethers such as ROSiEt3, ROSiPh3, ROSit-BuMe2, and ROSii-Pr3 were also applicable.
A mild and efficient method for the selective deprotection of silyl ethers using KF in the presence of tetraethylene glycol
作者:Hailong Yan、Joong-Suk Oh、Choong Eui Song
DOI:10.1039/c1ob06300f
日期:——
efficient protocol for the deprotection of silylethers using KF in tetraethylene glycol is reported. A wide range of alcoholic silylethers can be selectively cleaved in high yield in the presence of certain acid- and base-labile functional groups. Moreover, the phenolic silylethers were cleaved exclusively, without affecting the alcoholic silylethers, at room temperature.
Photo Lewis acid generators: photorelease of B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> and applications to catalysis
作者:Andrey Y. Khalimon、Bryan K. Shaw、Adam J. V. Marwitz、Warren E. Piers、James M. Blackwell、Masood Parvez
DOI:10.1039/c5dt03008k
日期:——
A series of molecules capable of releasing of the strong organometallic LewisacidB(C6F5)3 upon exposure to 254 nm light have been developed. These photo Lewisacid generators (PhLAGs) can now serve as photoinitiators for several important B(C6F5)3-catalyzed reactions. Herein is described the synthesis of the triphenylsulfonium and diphenyliodonium salts of carbamato- and hydridoborates, their establishment
已经开发出了一系列能够在暴露于254 nm的光后释放出强有机金属路易斯酸B(C 6 F 5)3的分子。这些光路易斯酸产生剂(PhLAG)现在可以用作几个重要的B(C 6 F 5)3催化反应的光引发剂。本文描述了氨基甲酸酯和氢硼酸酯的三苯基s盐和二苯基碘鎓盐的合成,它们作为PhLAG的建立以及旨在确定硼烷释放机理的研究。还讨论了影响这些光解反应的因素以及该概念在光诱导的氢化硅烷化反应中的应用以及硅氧烷支架的构建。