(4,0)-Dirhodium(II) tetrakis[methyl 1-acetyl-2-oxoimidazolidine-4(S)-carboxylate]. Implications for the mechanism of ligand exchange reactions
作者:Michael P. Doyle、Conrad E. Raab、Gregory H.P. Roos、Vincent Lynch、Stanley H. Simonsen
DOI:10.1016/s0020-1693(97)05525-4
日期:1997.12
The preparation and structural characterization of an elusive geometrical isomer of dirhodium(II) tetrakis[methyl 1-acetyl-2-oxoimidazolidine-4(S)-carboxylate], Rh2(4S-MACIM)4, has been achieved. The imidazolidinone ligands are arrayed around the dirhodium(II) core with four nitrogen donor atoms bound to one rhodium and four oxygens bound to the other (4,0). The crystal structure of this compound has
已经实现了四[甲基1-乙酰基-2-氧代咪唑烷-4(S)-羧酸甲酯]的铑(II)的难以捉摸的几何异构体Rh 2(4 S -MACIM)4的制备和结构表征。咪唑烷酮配体排列在dirhodium(II)核周围,四个氮供体原子键合到一个铑上,四个氧键合到另一个铑上(4,0)。该化合物的晶体结构已确定为(4,0)-Rh 2(4 S -MACIM)4(CH 3 CN)2 d(CH 3 CN):空间基团P 2(in1)与细胞常数一个= 11.518(4), 。通过在Rh 2(OAc)4上进行配体取代而制备的(4,0)-Rh 2(4 s -MACIM)4的分离产率为25%,但该化合物异构化为其(2,2-顺式)-和( 3,1)-异构体在反应条件下。外消旋产物是从(4,0)-Rh 2(4 S -MACIM)4在重氮分解反应中的催化用途获得的。