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
Hydrosilylation of aromatic aldehydes and acetophenone with H2SiPh2 was studied by using Pt complexes as the catalyst. Reaction of aromatic aldehydes, such as PhCHO, 4-FC6H4CHO, 4-MeC6H4CHO and 4-CF3C6H4CHO with H2SiPh2 in the presence of [Pt(PPh3)3] catalyst proceeds smoothly at room temperature with similar reaction rates. The hydrosilylation of PhCHO with H2Si(C6H4-4-Me)2 proceeds faster than that
以铂配合物为催化剂,研究了芳香醛和苯乙酮与 Ph2 的氢化硅烷化反应。在 [Pt(PPh3)3] 催化剂存在下,芳香醛,如 PhCHO、4-F CHO、4-Me CHO 和 4-CF3 CHO 与 Ph2 的反应在室温下以相似的反应速率顺利进行。PhCHO 与 H2Si(C6H4-4-Me)2 的氢化硅烷化进行得比 Ph2 更快。PhCHO 与 Ph2 和 D2SiPh2 的反应的比较证明了大的动力学同位素效应 (3.1)。由 [Pt(PMe3)(μ-SiPh2)]3 催化的醛的氢化硅烷化,在我们之前的论文中报道,显示反应速率对底物的芳基有很大的依赖性,顺序为 4-Me CHO ≫ PhCHO = 4-F CHO > 4-CF3 CHO。在 [Pt(PPh3)3] 催化剂存在下,(3-乙烯基)苯甲醛和 10-十一烯醛的氢化
Convenient route to di- and triorganosilyl ethyl ethers and the corresponding di- and triorganosilanes
作者:James M. Tour、Jens A. John、Erie B. Stephens
DOI:10.1016/0022-328x(92)83181-g
日期:1992.5
alkyl- and aryllithium reagents for the preparation of organosilyl ethyl ethers of the type R3SiOEt, R2R′SiOEt, and R2Si(OEt)2, that can be reduced to the organosilanes R3SiH, R2R′SiH, and R2SiH2, respectively. Compounds of the type RR′R′SiOEt cannot be cleanly formed. The reduction procedure involves treatment of the silyl alkoxy ethers with diisobutylaluminium hydride (DIBALH) and hydrolysis of the remaining
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。