The First Ru(η<sup>3</sup>-PCP) Complexes of the Electron-Rich Pincer Ligand 1,3-Bis((dicyclohexylphosphino)methyl)benzene: Structure and Mechanism in Transfer Hydrogenation Catalysis
作者:Dino Amoroso、Amir Jabri、Glenn P. A. Yap、Dmitry G. Gusev、Eduardo N. dos Santos、Deryn E. Fogg
DOI:10.1021/om040025x
日期:2004.8.1
hydride and N2 ligands are trans or cis (4a or 4b, respectively). On exposure to H2, 4a/b undergo immediate, quantitative exchange of bound N2 for η2-H2, affording the corresponding isomers of RuH(η3-PCP)(PPh3)(H2), 5a/b. Complex 3·PPh3 resists displacement of PPh3 by H2 at 22 °C, but on exposure to CO, readily yields RuCl(η3-PCP)(CO)2, 6. Transfer hydrogenation of ketones is efficiently catalyzed by 3·PPh3
温和路由到第一Ru(η 3 - ((二环己基膦甲基))报道-pincer)双苯衍生物。的RuCl(η 3 -PCP)(PPH 3)(3 ·PPH 3 ; PCP = [2,6-(CY 2 PCH 2)2 C ^ 6 ħ 3 ])定量形成在PC的反应(H)P-碱存在下,在22°C下具有RuCl 2(PPh 3)3的芳烃配体。KHB s处理3 ·PPh 3卜3氮气氛下,生成期RuH(η 3 -PCP)(PPH 3)(N 2),4,作为构象异构体的混合物,其中氢化物和N 2个配位体是反式或顺式(图4a或图4b分别)。在暴露至H 2,4A / B经历的结合的N-立即,定量交换2为η 2 -H 2,得到期RuH(η的对应异构体3 -PCP)(PPH 3)(H 2),5A / B。配合物3 ·PPh 3抗蚀剂PPH的位移3用H 2在22℃,但在暴露于CO,容易产生的RuCl(η 3 -PCP)(CO)2,6。3