C(O)CH3). Removal of one carbonyl from 2 yields the fluxional methyl complex [Ir2(CH3)(CO)2(dppm)2][CF3SO3] (3) in which the methyl group readily migrates from metal to metal. Addition of CO, PR3, CNtBu or SO2 to 3 results in C−H bond cleavage of the methyl group yielding the methylene-bridged, hydride species, [Ir2H(CO)2L(μ-CH2)(dppm)2][CF3SO3] (L = CO, PR3, CNtBu) or [Ir2H(CO)2(μ-CH2)(μ-SO2)(dppm)2][CF3SO3]
                                    [Ir2(CO)3(dppm)2] (dppm = Ph2PCH2PPh2) 与三
氟甲磺酸甲酯反应生成亚甲基桥连
氢化物 [Ir2H(CO)3(μ-
CH2)(dppm)2][CF3SO3] (2) ,其中
氢化物和亚甲基氢在环境温度下迅速加扰。在 CO 下,该物种产生甲基和酰基产物 [Ir2(R)(CO)4(dppm)2][CF3SO3](R = 
CH3,C(O)   )。从 2 中去除一个羰基会产生流动甲基络合物 [Ir2(   )(CO)2(dppm)2][CF3SO3] (3),其中甲基很容易从
金属迁移到
金属。将 CO、PR3、CNtBu 或 SO2 添加到 3 会导致甲基的 C-H 键断裂,产生亚甲基桥连的
氢化物 [Ir2H(CO)2L(μ-   )(dppm)2][CF3SO3] (L = CO, PR3, CNtBu) 或 [Ir2H(CO)2(μ-   )(μ-SO2)(dppm)2][CF3SO3]