Mild and efficient silylation of alcohols and phenols with HMDS using Bi(OTf)3 under solvent-free condition
作者:Santosh T. Kadam、Sung Soo Kim
DOI:10.1016/j.jorganchem.2009.04.001
日期:2009.7
A very efficient and mildsilylation of alcohols and phenols with hexamethyldisilazane (HMDS) at rt is developed using Bi(OTf)3 as the catalyst. Primary, secondary and tertiary alcohols as well as phenols are excellently converted into corresponding TMS ethers in a very short reaction time. This procedure can also be applied to large scale silylation for industrial application.
Nafion® SAC-13: heterogeneous and reusable catalyst for the activation of HMDS for efficient and selective O-silylation reactions under solvent-free condition
作者:Gurusamy Rajagopal、Hanbin Lee、Sung Soo Kim
DOI:10.1016/j.tet.2009.04.025
日期:2009.6
hexamethyldisilazane (HMDS) for the efficient and selective silylation of alcohols. Primary, secondary, and tertiaryalcohols and phenols are efficiently converted to their corresponding silylethers in short reaction times (4–8 min) with excellent yield at rt under solvent-free condition. Simple and clean reactions, high yield of the products and efficient recycling of the catalyst are the salient features of
Cross-linked poly(4-vinylpyridine/styrene) copolymer-supported bismuth(III) triflate: an efficient heterogeneous catalyst for silylation of alcohols and phenols with HMDS
作者:Sang-Hyeup Lee、Santosh T. Kadam
DOI:10.1002/aoc.1809
日期:2011.8
Cross‐linked poly(4‐vinylpyridine/styrene) copolymer‐supported bismuth(III) triflate (30P/S‐Bi) effectively activates hexamethyldisilazane (HMDS) for the silylation of alcohols and phenols. By the use of this heterogeneous catalytic system, a wide range of alcohols as well as phenols are converted into their corresponding trimethylsilyl ethers in high yield under mild reaction conditions. The catalyst was reused
A novel mechanism for the conversion of α-cyclopropylbenzyl alcohol into γ-trimethylsilylbutyrophenone
作者:Jih Ru Hwu
DOI:10.1039/c39850000452
日期:——
Mechanistic studies of the reaction between α-cyclopropylbenzylalcohol and methyl-lithium followed by hexamethyldisilane indicate that disproportionation of intermediate (4) with trimethylsilyl anion as catalyst provides cyclopropyl phenyl ketone; in situ 1,4-addition of trimethylsilyl anion to the latter compound leads to the major product, γ-trimethylsilylbutyrophenone (2).
Revisiting the Mg/TMSCl/Dipolar Solvent System for Dearomatic Silylation of Aryl Carbonyl Compounds: Substrate Scope, Transformations, and Mechanistic Studies
demonstrated using the products as versatile substrate in various transformations. The detailed mechanism is presented with both control experimental analyses and theoretical calculations. An unusual five-coordinated silicon dianion intermediate is first proposed and described here. The selectivity is influenced by the relative rates of single electron reductions (the TMSCl/NMP adduct versus the substrate)