Hydrosilylation with Biscarbene Rh(I) Complexes: Experimental Evidence for a Silylene-Based Mechanism
作者:Peter Gigler、Bettina Bechlars、Wolfgang A. Herrmann、Fritz E. Kühn
DOI:10.1021/ja110017c
日期:2011.2.9
of the hydrosilylation of 4-F-acetophenone by N-heterocyclic biscarbene rhodium(I) complexes was performed, delivering substantial experimental evidence for a recently proposed catalytic cycle and explaining the observed side-product formation. Labeling experiments, silylene trapping reactions, and specific catalytic reactions were employed to substantiate each step of the catalytic cycle and explain
Highly selective redistribution of primary arylsilanes to secondary arylsilanes catalyzed by Ln(CH<sub>2</sub>C<sub>6</sub>H<sub>4</sub>NMe<sub>2</sub>-<i>o</i>)<sub>3</sub>@SBA-15
作者:Chenjun Guo、Min Li、Jue Chen、Yunjie Luo
DOI:10.1039/c9cc07493g
日期:——
Rare-earth metal tris(aminobenzyl) complexes Ln(CH2C6H4NMe2-o)3 (Ln = La, Y) were grafted onto the dehydroxylated periodic mesoporous silica support SBA-15 to generate the organometallic–inorganic hybrid materials Ln(CH2C6H4NMe2-o)3@SBA-15 (Ln = La (2a), Y (2b)), which demonstrated extremely high selectivity (>99%) in catalyzing the redistribution of primary arylsilanes to secondary arylsilanes without
将稀土金属三(氨基苄基)配合物Ln(CH 2 C 6 H 4 NMe 2 - o)3(Ln = La,Y)接枝到脱羟基的周期性介孔二氧化硅载体SBA-15上,以生成有机金属-无机杂化材料Ln(CH 2 C 6 H 4 NMe 2 - o)3 @ SBA-15(Ln = La(2a),Y(2b)))在催化伯芳基硅烷向仲芳基硅烷的再分布方面表现出极高的选择性(> 99%),而无需严格控制反应条件。在三个催化循环后,杂化材料仍显示出完美的选择性和活性。
Highly Regio‐ and Enantioselective Hydrosilylation of
<i>gem</i>
‐Difluoroalkenes by Nickel Catalysis
Highly efficient enantioselective nickel-catalyzed hydrosilylation of gem-difluoroalkenes has been realized. This system integrates direct generation of difluoromethylated stereocenters and enantioselective carbon(sp3)−silicon bond formation.
Selective homo- and cross-desilacoupling of aryl and benzyl primary silanes catalyzed by a barium complex
作者:Zhizhou Liu、Xianghui Shi、Jianhua Cheng
DOI:10.1039/d0dt01158d
日期:——
Under mild conditions (25 °C, 5 mol% cat.), highly selective homo- and cross-desilacoupling of aryl and benzyl primary silanes to secondary silanes was achieved by the use of the heteroleptic barium aminobenzyl complex [(TpAd,iPr)Ba(CH2C6H4NMe2-o)] (TpAd,iPr = hydrotris(3-adamantyl-5-isopropyl-pyrazolyl)borate) (1) as a catalyst. Dihydrosilanes originating from catalytic redistribution and cross-desilacoupling
在温和的条件下(25°C,5 mol%催化),通过使用杂芳基钡氨基苄基络合物[(Tp Ad,iPr),实现了芳基和苄基伯硅烷与仲硅烷的高选择性均-和交叉-脱硅偶联。Ba(CH 2 C 6 H 4 NMe 2 - o)](Tp Ad,iPr =氢三(3-金刚烷基-5-异丙基-吡唑基)硼酸酯)(1)。分离出了源自催化重分布和交叉脱硅偶联反应的二氢硅烷,收率很高,这表明钡络合物在仲芳基和苄基硅烷合成中的可行性应用。
Efficient Synthesis of Substituted Diarylsilanes
作者:Wolfgang Herrmann、Fritz Kühn、Peter Gigler
DOI:10.1055/s-0029-1218696
日期:2010.5
diarylsilane by stirring with lithiumaluminumhydride in diethyl ether. The product is purified by bulb-to-bulb distillation. This method does not lead to any mono- or tri-substituted products and avoids handling gaseous and explosive dichlorosilane, which is a significant advantage over previously reported procedures. arylation - hydrosilylation - lithiation - reduction - silicon