Regioselective Hydrosilylation of Olefins Catalyzed by a Molecular Calcium Hydride Cation
作者:Danny Schuhknecht、Thomas P. Spaniol、Laurent Maron、Jun Okuda
DOI:10.1002/anie.201909585
日期:2020.1.2
Chemo- and regioselectivity are often difficult to control during olefin hydrosilylation catalyzed by d- and f-block metal complexes. The cationichydride of calcium [CaH]+ stabilized by an NNNNmacrocycle was found to catalyze the regioselective hydrosilylation of aliphatic olefins to give anti-Markovnikov products, while aryl-substituted olefins were hydrosilyated with Markovnikov regioselectivity
Organocalcium Complex-Catalyzed Selective Redistribution of ArSiH<sub>3</sub> or Ar(alkyl)SiH<sub>2</sub> to Ar<sub>3</sub>SiH or Ar<sub>2</sub>(alkyl)SiH
作者:Tao Li、Karl N. McCabe、Laurent Maron、Xuebing Leng、Yaofeng Chen
DOI:10.1021/acscatal.1c00463
日期:2021.6.4
compounds. Herein, we report the synthesis and structural characterization of two calcium alkyl complexessupported by β-diketiminato-based tetradentate ligands. These two calcium alkyl complexes react with PhSiH3 to generate calcium hydrido complexes, and the stability of the hydrido complexes depends on the supportingligands. One calcium alkyl complex efficiently catalyzes the selective redistribution
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。
Reactivity Patterns of O<sub>2</sub>, CO<sub>2</sub>, Carboxylic Acids, and Triflic Acid with Molybdenum Silyl Hydrido Complexes Bearing Polydentate Phosphinoalkyl–Silyl Ligands: Pronounced Effects of Silyl Ligands on Reactions
of Mo as a consequence of the strong trans influence of the silyl ligand. In contrast, the replacement of the phenyl group on a Si fragment by an electron-withdrawing perfluoro phenyl group, as in 3b, gives rise to a dramatic decrease in the trans influence. Treatment of 2a–c with 2 equiv of carboxylicacids, such as formic acid, acetic acid, and benzoic acid, readily leads to the formation of carboxylato
一系列钼甲硅烷基氢化物络合物[MoH 3 [Ph 2 PCH 2 CH 2 P(Ph)C 6 H 4 - o ] 2(R)Si- P,P,P,P,Si }的反应模式](2a,R = Ph; 2b,R = C 6 F 5 ; 2c,R = 4-Me 2 NC 6 H 4 ; 2d,R =环己基; 2e,R = n -C 6 H 13),已经研究了对亲电子材料,包括双氧,二氧化碳,羧酸和三氟甲磺酸。详细研究了在五重螯合的二膦-甲硅烷基配体中直接连接到Si原子上的取代基的影响。络合物2A - Ç与双氧容易反应在环境温度下,得到η 2个-O 2络合物图3a - Ç,其中双氧配体连接产物在现场相反Si原子。单晶X射线研究已经确定,包含苯基取代的Si片段的3a的Mo–O距离明显长于普通η中的Mo–O距离2 -O 2配合物,其中中心原子的大小几乎与Mo相等,这是甲硅烷基配体的强反式影响的结果。相反,如
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。