spectra and elemental analyses. The molecular structures of 5–7 have been confirmed by X-ray single-crystal analyses. The iridium carbene complexes 4 and 6 show moderate catalytic activities (3.03 × 105 g PNB (mol Ir)−1 h−1 and 1.70 × 106 g PNB (mol Ir)−1 h−1) for the addition polymerization of norbornene in the presence of methylaluminoxane (MAO) as co-catalyst. The produced polynorbornene have been
                                    吡啶基,
吡啶和甲基官能化的N-杂环卡宾
铱络合物[Cp ∗ Ir(C ^ N)Cl] Cl(4,C ^ N = 3-甲基-1-
吡啶并
咪唑-2-亚基),[Cp ∗ Ir( C ^ N)Cl] [Cp ∗ IrCl 3 ](5),[Cp ∗ Ir(CN)Cl] Cl(6,CN = 3-甲基-1-
吡啶基
咪唑-2-亚基)和[Cp ∗ Ir(L )Cl 2 ](7,L = 1,3-二甲基
咪唑-2-亚烷基)已经通过Ag(I)卡宾物种的
金属转移反应合成,并通过1 H NMR,13 C NMR光谱和元素分析表征。5-7的分子结构X射线单晶分析已证实。
铱卡宾配合物4和6对
降冰片烯的加成聚合反应显示出中等的催化活性(3.03×10 5  g 
PNB(mol Ir)-1  h -1和1.70×10 6  g 
PNB(mol Ir)-1  h -1)在甲基铝氧烷(MAO)作为助催化剂存在下。所产生的聚
降冰片烯已通过IR,1