Mechanistic aspects of catalytic hydrogenation of ketones by rhodium(I)-peralkyldiphosphine complexes
作者:Kazuhide Tani、Eiji Tanigawa、Yoshitaka Tatsuno、Sei Otsuka
DOI:10.1016/0022-328x(85)87008-x
日期:1985.1
Mechanistic aspects of the hydrogenation of ketones employing cationic rhodium(I) complexes [Rh((i-Pr)2P(CH2)4P(i-Pr)2)(NBD)]ClO4 (NBD = norbornadiene) and [Rh(CyDIOP)(NBD)]ClO4 (CyDIOP = 2,3-O-isopropylidene-2,3-dihydroxy-1,4-bis(dicyclohexylphosphino)butane) and a neutral complex, “Rh-(CyDIOP)Cl” were studied. The cationic complex-catalyzed hydrogenation of the poor coordinating simple ketone substrates
使用阳离子铑(I)配合物[Rh((i-Pr)2 P(CH 2)4 P(i-Pr)2)(NBD)] ClO 4(NBD =降冰片二烯)和[ Rh(CyDIOP)(NBD)] ClO 4(CyDIOP = 2,3- O-异亚丙基-2,3-二羟基-1,4-双(二环己基膦基)丁烷)和中性配合物,“ Rh-(CyDIOP)Cl”被研究了。配位较差的简单酮底物的阳离子络合物催化氢化反应遵循速率方程r 0 = k obs [Rh] [酮] 0 [H 2 ] 0并显示出反应速率异常负的温度依赖性。螯合底物PhCOCONHCH 2 Ph的氢化反应遵循速率方程r 0 = k obs [Rh] [H 2 ],活化参数为E a 5.51 kcal mol -1,ΔH ‡ 308 4.90 kcal mol -1,ΔS ‡ 308 -32.0 eu([Rh((i-Pr)2 P(CH 2)4 P(i-Pr)2)(NBD)]