reaction of 1.0 equivalents of CF3COOAg with 1. The use of an excess of CF3COOAg resulted in the replacement of Rh(I) by Ag(I) and yielded Ag(1,3-dimesityltetrahydropyrimidin-2-ylidene)+Rh2(CF3COO)3(COD)− (8). Compounds 4 and 8 were characterized by X-ray analysis. The activity of the rhodium complexes increased in the order 5>3>1>2, indicating the necessity of strongly electron-withdrawing groups at the metal
六个不同的明确定义的
铑和
铱N-杂环卡宾配合物,即RhCl(1,3-dimesityltetrahydropyrimidin-2- ylidene )(COD)(1),RhBr(1,3-dimesityltetrahydropyrimidin-2-ylidene)(COD) (2),RhCl [1,3-二(2-丙基)四氢
嘧啶-2-亚基](COD)(3),IrCl(1,3-二甲基四氢
嘧啶-2-亚基)(COD)(4),Rh( CF 3 COO)(1,3-二甲基四氢
嘧啶-2-亚基)(COD)(5)和IrBr [1,3-二(2-丙基)四氢
嘧啶-2-亚基](COD)(6)(COD =
1,5-环辛二烯,
1,5-环辛二烯= 2,4,6-三甲基苯基)已被用作使用不同的芳基
硼酸将醛和α,β-不饱和酮芳基化的催化剂。化合物1– 4和6分别通过[RhCl(COD)] 2和[IrCl(COD)] 2与碱和相应的1