Optically active complexes of transition metals (RhI, RuII, CoII and NiII) with 2-aminocarbonylpyrrolidine ligands. Selective catalysts for hydrogenation of prochiral olefins
作者:A. Corma、M. Iglesias、C. del Pino、F. Sánchez
DOI:10.1016/0022-328x(92)80121-d
日期:1992.6
The synthesis and characterization of optically active complexes containing organic amides [-C(O)NHR] of the type [RhCl(COD)L], [RhCl(CO)2 L], [RhCl(PPh3)2L], [RuCl2(COD)L], [RuCl2(PPh3)2L], [Co(acac)L]X and [Ni(acac)L]X, where L = (S)-2-t-butylaminocarbonylpyrrolidine or (S)-2-(3-triethoxysilyl)propylaminocarbonylpyrrolidine are reported. Their cationic species were prepared in the presence of a non-coordinating
包含[RhCl(COD)L ],[RhCl(CO)2 L ],[RhCl(PPh 3)2 L ],[ RuCl 2(COD)L ],[RuCl 2(PPh 3)2 L ],[Co(acac)L ] X和[Ni(acac)L ] X,其中L =(S)-2-叔丁基氨基羰基吡咯烷或(S报道了)-2-(3-三乙氧基甲硅烷基)丙基氨基羰基吡咯烷。在非配位抗衡离子(X = PF的存在下,制备它们的阳离子物质6 -或C10 4 - )。氨基酸衍生物是双齿的,具有N,N-配位。具有配体的含有三乙氧基甲硅烷基的金属络合物被固定在二氧化硅和改性的USY沸石上。这些配合物已通过光谱和分析技术进行了表征。固定在沸石上的配合物(包含大量的超微孔)显示出更高的烯烃加氢活性,并在乙基氢化中显着提高了对映选择性(> 95%)(Z)-α-苯甲酰基氨基肉桂酸酯为模型,它们代表了均相有机金属催化剂的真正异质对应物。