norbornene in the presence of trimethylsilyldiazomethane as the carbene source. The same compounds 4nx are also used as catalyst precursors in the transfer hydrogenation of a series of ketone substrates using alcohol as the hydrogen source. For example, the hydrogenation of cyclohexanone is achieved in 99% yield within 45 s with only 0.01 mol (0.1 mol %) of the precatalyst RuCl2(Ph2PCH2pic)(PPh3)-trans-Cl (41a)
本文研究了Ru(II)的一系列
吡啶官能化膦配合物RuCl 2(L nx)(PPh 3)(L nx = R 2
PCH 2(C 5 H 2 R'R''N)),在不同的
磷在取代基的性质(上标标签ñ在大号NX定义为ñ = 1为R = PH,ñ = 2 R = CY)和/或
吡啶基组(上标标签X在大号NX定义为X =一个为
吡啶甲基,注意到
PIC,和X = b为
喹啉基,五重峰指出)和公开它们的反应性的新的方面相对于催化。
配体2-[((
二苯基膦基)
甲基] -6-
甲基吡啶,L 1a,2-[((
二苯基膦基)
甲基]
喹啉,L 1b,2-[((
二环己基膦基)
甲基] -6-
甲基吡啶,L 2a和2-制备[(
二环己基膦基)
甲基]
喹啉,L 2b,并在优化的实验条件下分别使其与RuCl 2(PPh 3)3反应。在初步测试中,RuCl 2(PPh 3)3与L 1a的
化学计量比为1/1的
金属/
配体比率得到三个络合物,即[RuCl