Continuous-flow Si–H functionalizations of hydrosilanes <i>via</i> sequential organolithium reactions catalyzed by potassium <i>tert</i>-butoxide
作者:Hyune-Jea Lee、Changmo Kwak、Dong-Pyo Kim、Heejin Kim
DOI:10.1039/d0gc03213a
日期:——
tri-functionalizations of unactivated hydrosilanes via serial organolithiumreactions catalyzed by earth-abundant metal compounds. Based on the screening of various additives, we found that catalytic potassium tert-butoxide (t-BuOK) facilitates the rapid reaction of organolithiums with hydrosilanes. Using a flow microreactor system, various organolithiums bearing functional groups were efficiently generated
Electrophilic Formylation of Arenes by Silylium Ion Mediated Activation of Carbon Monoxide
作者:Lukas Omann、Zheng‐Wang Qu、Elisabeth Irran、Hendrik F. T. Klare、Stefan Grimme、Martin Oestreich
DOI:10.1002/anie.201803181
日期:2018.7.2
Arene‐stabilized silylium ions react with carbon monoxide rather than carbon monoxide adducts of silylium ions reacting with arenes. This mechanism is supported by quantum‐chemical calculations. Even sterically hindered mesitylene and electronically deactivated chlorobenzene engage in this electrophilic aromatic substitution. The silylium ion mediated formylation corresponds to Gattermann–Koch reactions
Supported palladium‐goldalloy‐catalyzed cross‐coupling of aryl chlorides and hydrosilanes enabled the selective formation of aryl‐silicon bonds. Whereas a monometallic palladium catalyst predominantly promoted the hydrodechlorination of aryl chlorides and goldnanoparticles showed no catalytic activity, gold‐rich palladium‐goldalloynanoparticles efficiently catalyzed the title reaction to give arylsilanes
of two mono-and ten di-substituted derivatives. - Alkyl groups, as present in tert-butylbenzene, retard the metalation at both m- and p- positions, while trialkylsilyl groups deactive only m-positions. In either case exclusive monosubstitution occurs. -Perdeuterobenzene undergoes metalation and subsequent electrophilic mono-or disubstitution to afford isotope labeled compounds with moderate, through
Regioselective Alkylation of (<i>η</i><sup>6</sup>-Triisopropylsilylbenzene)chromium(0) Complex with Organolithium Compounds
作者:Koichi Narasaka、Hidehiro Sakurai、Changqing Liu
DOI:10.1246/bcsj.67.1156
日期:1994.4
Reactions of tricarbonyl(η6-triisopropylsilyl(TIPS)benzene)chromium(0) complex 1b with various alkyllithiums proceed regioselectively, giving para-substituted TIPSbenzenes in high yield after oxidation with iodine. Vinyllithiums also react with the TIPSbenzenechromium complex to give para-TIPSstyrenes in good yield. In the reaction with phenyllithium, although the para-substituted product is obtained