A series of (salicylaldiminato)methylnickel complexesefficiently catalyse hydrosilylation of various olefins. The complexes are highlyactive for secondary hydrosilanes and exhibit excellent selectivity for monohydrosilylation. A possible mechanism, which includes a silylnickel complex as a key active species, is proposed.
Reversible Substrate Activation and Catalysis at an Intact Metal–Metal Bond Using a Redox-Active Supporting Ligand
作者:Talia J. Steiman、Christopher Uyeda
DOI:10.1021/jacs.5b03092
日期:2015.5.13
the π-system of the NDI ligand. Based on this dinuclear mode of activation, [NDI]Ni2 complexes are shown to catalyze the high-yielding hydrosilylation of alkenes, dienes, alkynes, aldehydes, ketones, enones, and amides. In comparative studies of alkyne hydrosilylations, the [NDI]Ni2 catalyst is found to be significantly more active than its mononuclear counterparts for aryl-substituted substrates.
Transition-metal- and solvent-free regioselective hydrosilylation of alkenes and allenes enabled by catalytic sodium <i>tert</i>-butoxide
作者:Suresh Saini、Dharmendra Kumar Gupta、Ramesh Bhawar、Sheema Siddiqui、Manoj V. Mane、Shubhankar Kumar Bose
DOI:10.1039/d3gc03473a
日期:——
products of alkenes are of industrial importance, and the development of methods with Markovnikov selectivity is a growing area of research and still relatively rare. Herein, we have developed a convenient, transition-metal- and solvent-free method involving the alkali metal Lewis base NaOtBu as a catalyst and diphenyl silane (Ph2SiH2) as a silane reagent for the regioselective Markovnikov hydrosilylation
烯烃的β-选择性氢化硅烷化产物具有工业重要性,具有马尔可夫尼科夫选择性的方法的开发是一个不断发展的研究领域,但仍然相对较少。在此,我们开发了一种方便的、无过渡金属和溶剂的方法,涉及碱金属路易斯碱NaO t Bu作为催化剂和二苯基硅烷(Ph 2 SiH 2)作为硅烷试剂,用于乙烯基芳烃的区域选择性马尔可夫尼科夫氢化硅烷化和脂肪族烯烃的产率高,且具有良好的官能团相容性。重要的是,丙二烯与Ph 2 SiH 2的氢化硅烷化以区域选择性方式进行,得到( E )-烯丙基硅烷产物。利用地球上丰富的钠阳离子作为氢化硅烷化反应的催化剂似乎是前所未有的。我们假设形成了五配位硅“ate”中间体,红外和质谱证明了这一点。自由基时钟和捕获实验支持自由基介导的催化过程。
(Pentamethylcyclopentadienyl)samarium(II) Alkyl Complex with the Neutral “C<sub>5</sub>Me<sub>5</sub>K” Ligand: A Precursor to the First Dihydrido Lanthanide(III) Complex and a Precatalyst for Hydrosilylation of Olefins
Ene cyclisations of α-(prenyl)dialkylsilyloxy aldehydes: formation and oxidative cleavage of oxasilacyclohexanols
作者:Jeremy Robertson、Michael J. Hall、Petra M. Stafford、Stuart P. Green
DOI:10.1039/b306922m
日期:——
A variety of routes are described for the synthesis of α-silyloxy aldehydes in which the silicon atom bears a prenyl side chain. These compounds are shown to undergo stereoselective carbonyl ene cyclisation under mildly Lewis acidic conditions and the derived silacycles are cleaved to afford single diastereomers of functionalised triols.