The synthesis of silafluorene derivativesfrom aminobiphenyl compounds and dihydrosilanes via a double sila-Friedel–Crafts reaction using a borane catalyst has been achieved. This method is applicable to the synthesis of a variety of silafluorene derivatives, such as multisubstituted silafluorenes, spirosilabifluorenes, and silicon-bridged terphenyl compounds, which are not readily obtained using conventional
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
Dichotomy of Manganese Catalysis via Organometallic or Radical Mechanism: Stereodivergent Hydrosilylation of Alkynes
作者:Xiaoxu Yang、Congyang Wang
DOI:10.1002/anie.201710206
日期:2018.1.22
Herein, we disclose the first manganese‐catalyzed hydrosilylation of alkynes featuring diverse selectivities. The highly selective formation of E‐products was achieved by using mononuclear MnBr(CO)5 with the arsenic ligand, AsPh3. Whereas using the dinuclear catalyst Mn2(CO)10 and LPO (dilauroyl peroxide) enabled the reversed generation of Z‐products in good to excellent stereo‐ and regioselectivity
Consecutive β,β′‐Selective C(sp
<sup>3</sup>
)−H Silylation of Tertiary Amines with Dihydrosilanes Catalyzed by B(C
<sub>6</sub>
F
<sub>5</sub>
)
<sub>3</sub>
the two‐fold C(sp3)−H silylation of various trialkylamine derivatives with dihydrosilanes, furnishing the corresponding 4‐silapiperidines in decent yields. The multi‐step reaction cascade involves amine‐to‐enamine dehydrogenation at two alkyl residues and two electrophilic silylation reactions of those enamines, one inter‐ and one intramolecular.
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。