The aminophosphine ligands R2P(CH2)2NH2 and R2P(CH2)3NH2 (R = Ph, iPr, tBu) were isolated in good to excellent yields from the reaction of LiPR2 with Cl(CH2)2N(TMS)2 and Cl(CH2)3N(TMS)2, respectively, followed by hydrolysis. This approach allows fine tuning of the ligands' stereoelectronic properties through the variation of the substituents on the phosphine. The aminophosphine ligands were used to prepare the ruthenium complexes RuCl2(R2P(CH2)2NH2)2 and RuCl2(R2P(CH2)3NH2)2 by reacting a 2:1 mixture of the respective ligand and [RuCl2(cod)]n in an appropriate solvent. The resulting complexes were found to be excellent catalysts for the hydrogenation of ketones and imines.
氨基
膦配体R2P(
CH2)2NH2和R2P( )3NH2(R = Ph,iPr,tBu)分别通过LiPR2与Cl( )2N(TMS)2和Cl( )3N(TMS)2反应后
水解,以良好的至优异的产率被分离出来。这种方法通过改变膦上的取代基,可以精细调节
配体的立体电子性质。利用这些
氨基
膦配体,通过在适当溶剂中将相应的
配体与[RuCl2(cod)]n按2:1混合反应,制备了
钌配合物RuCl2(R2P( )2NH2)2和RuCl2(R2P( )3NH2)2。所得配合物被发现是酮和
亚胺氢化的优异催化剂。