Mechanistic Study of Ruthenium-Catalyzed Hydrosilation of 1-(Trimethylsilyl)-1-buten-3-yne
作者:Yooichiroh Maruyama、Kunihiro Yamamura、Isao Nakayama、Keigo Yoshiuchi、Fumiyuki Ozawa
DOI:10.1021/ja973718w
日期:1998.2.1
investigations on the stoichiometric reactions of intermediate ruthenium species provided definitive evidence for the catalytic mechanism comprised of two catalytic cycles, the Chalk−Harrod cycle A and the modified Chalk−Harrod cycle C, and their interconnecting processes B and D. Product 3 is formed by the insertion of 1 into the Ru−H bond of 2 followed by the reaction of the resulting terminal dienyl complex
1-(三甲基甲硅烷基)-1-丁烯-3-炔 (1) 与三种氢硅烷(HSiMePh2、HSiMe2Ph 和 HSiEt3)在 CDCl3 中在 30°C 下在催化量的 RuHCl(CO) 存在下催化氢化硅烷(PPh3)3 (2) 得到五种反应产物:(1E,3E)-CH(SiR3)CHCHCHSiMe3 (3)、R3SiCH2CHCHCH2SiMe3 (4)、R3SiCHCCHCH2SiMe3 (5)、(1Z,3E)-CH(SiR3)CHCHCHSiMe3 (6) 和 R3SiC⋮CCHCHSiMe3 (7)。对中间钌物种的化学计量反应的详细研究为由两个催化循环(Chalk-Harrod 循环 A 和改良的 Chalk-Harrod 循环 C)及其互连过程 B 和 D 组成的催化机制提供了明确的证据。产物 3 是通过将 1 插入到 2 的 Ru-H 键中,然后将所得末端二烯基配合物 Ru(CHC