Dirhodium(II) tetrakis[N,N-dimethyl-2-pyrrolidone-5(S)-carboxamide]. Structural effects on enantioselection in metal carbene transformations
作者:Michael P. Doyle、William R. Winchester、Stanley H. Simonsen、Ratna Ghosh
DOI:10.1016/0020-1693(94)03872-4
日期:1994.6
Abstract The preparation and structural characterization of dirhodium(II) tetrakis[ N,N -dimethyl-2-pyrrolidone-5( S )-carb- oxamide], Rh 2 (5 S -DMAP) 4 , a new sterically-demanding catalyst for enantioselective metal carbene transformations, is described. The pyrrolidone ligands are arrayed around the dirhodium(II) core with two oxygen and two nitrogen donor atoms, each oriented cis , bound to each
摘要新型的空间位阻催化剂四[N,N-二甲基-2-吡咯烷酮-5(S)-碳-乙酰胺]铑(II)的制备及结构表征描述了对映选择性金属卡宾的转化。吡咯烷酮配体绕着二铑(II)核排列,带有两个氧和两个氮供体原子,每个原子定向为顺式,结合到每个八面体铑上。已确定该化合物的晶体结构为Rh 2(5 S -DMAP)4(CH 3 CN)2·CH 3 CN·6H 2 O:具有细胞常数a的空间群P 2 1 2 1 2 1 1。 = 12.685(4),b = 15.050(3),c = 24.035(4)A;V = 4588.5(1.9)A 3,Z = 4,R = 0.0316,RhRh距离= 2 4538(5)A。观察到Rh 2(5 S -DMAP)4催化的重氮分解活性降低,