Si–C coupling reaction of polychloromethanes with HSiCl3 in the presence of Bu4PCl: Convenient synthetic method for bis(chlorosilyl)methanes
作者:Dong Euy Jung、Seung-Hyun Kang、Joon Soo Han、Weon Cheol Lim、Young-ae W. Park、Bok Ryul Yoo
DOI:10.1016/j.jorganchem.2007.05.041
日期:2007.8
catalyst occurred at temperatures ranging from 30 °C to 150 °C. The reactivity of polychloromethanes increases as the number of chlorine-substituents on the carbon increases. In the reactions of CCl4 with HSiCl3, a variety of coupling products such as bis(chlorosilyl)methanes CH2(SiCl3)(SiXCl2) [X = Cl (1a), H (1b)], (chlorosilyl)trichloromthanes Cl3CSiXCl2 [X = Cl (2a), H (2b)], and (chlorosilyl)dichloromthanes
Cl--induced heterolysis of the Si-Si bond in Si2Cl6 generates an [SiCl3]- ion as reactive intermediate. When carried out in the presence of CCl4 or Cl2C═CCl2 (CH2Cl2 solutions, room temperature or below), the reaction furnishes the monocarbanion [C(SiCl3)3]- ([A]-; 92%) or the vicinal dianion [(Cl3Si)2C-C(SiCl3)2]2- ([B]2-; 85%) in excellent yields. Starting from [B]2-, the tetrasilylethane (Cl3Si)2(H)C-C(H)(SiCl3)2
1-halosilatranes is discussed. Some new preparative methods based on hetero- and homo-lytic reactions of the silatrane and the Si- and C-substituted silatranes with halogenating reagents are described and also synthetic routes to 1-halosilatranes from certain organotrialkoxy- and organotrichlorosilanes. The electrophilic reactions of 1-iodosilatrane with ethers and esters, carbonylcompounds, alkoxysilanes and siloxanes
Friedel–Crafts alkylation of benzene with (polychloromethyl)silanes
作者:Bok Ryul Yoo、Jeong Hyun Kim、Bong Gwan Cho、Il Nam Jung
DOI:10.1016/s0022-328x(01)00827-0
日期:2001.8
(Trichloromethyl)silanes (m=0, 1; n=3) reacted with excess benzene to give (triphenylmethyl)silanes as major products and the unusual (diphenylmethyl)silanes as minor. It was found that unusual (diphenylmethyl)silanes were formed by the decomposition of (triphenylmethyl)silanes under the reaction condition. In the alkylation to benzene, the reactivity of (polychloromethyl)silanes (Cl3−mMemSiCH3−nCln:
在氯化铝的存在下,(多氯甲基)硅烷(Cl 3- m Me m SiCH 3- n Cl n:m = 0–3;n = 2,3)与过量的苯反应生成(聚苯基甲基)硅烷。此类反应发生在室温(m = 2,3; n = 2)到80°C(m = 0,1; n = 2,3)的温度下,表明反应性随数量(m硅上的供电子甲基)。特别是在硅上带有两个或三个甲基的(二氯甲基)硅烷(m = 2或3; n= 2)在室温下进行烷基化和它们的产物分解。与(二氯甲基)三甲基硅烷的反应在室温下立即发生,不产生(二苯基甲基)三甲基硅烷,而是通过烷基化产物的分解得到二苯基甲烷和三甲基氯硅烷。(三氯甲基)硅烷(m = 0,1; n = 3)与过量的苯反应,得到(三苯基甲基)硅烷为主要产物,而不寻常的(二苯基甲基)硅烷为次要产物。发现在反应条件下通过(三苯基甲基)硅烷的分解形成了不寻常的(二苯基甲基)硅烷。在烷基化为苯的过程中,(聚氯甲基)硅烷(Cl
Trapping Experiments on a Trichlorosilanide Anion: a Key Intermediate of Halogenosilane Chemistry
furnished the known products of a chloride-induced disproportionation reaction of the disilane, such as SiCl4, [Si(SiCl3)3]−, and [Si6Cl12·2Cl]2–. No Si–B-bonded products were detectable. In contrast, the addition of Si2Cl6 to [Et4N][BI3Cl] afforded the Si–B adduct [Et4N][I3SiBI3]. Thus, a quantitative Cl/I exchange at the silicon atom accompanies the trihalogenosilanide formation. [Et4N][I3SiBI3] was