chain reaction by exciting CF3I. Complexes supported by PPh3 undergo reversible phosphine dissociation at 110 °C to generate a three-coordinate intermediate that undergoes slow reductive elimination. These processes are quantitative and heavily favor Caryl–I reductive elimination over Caryl–CF3 reductive elimination. Silver-mediated halide abstraction from all complexes of the type R3PAu(aryl)(CF3)I results
在这里,我们报告了
CF3I 氧化加成到 Au(I) 的机制,以及从 Au(III) 阳离子中显着快速地还原消除 Caryl-
CF3 键的机制。 对 R3PAuR' 进行快速、正式的氧化加成(R = Cy, R' = 3,5-F2-
C6H4, 4-F- ,
C6H5, 4-Me- , 4-MeO- , Me; R = Ph, R' = 4-F- , 4-Me- )。当 R' = 芳基时,可以分离和表征 R3PAu(芳基)( )I 类型的配合物。机理研究表明,近紫外光 (λmax = 313 nm) 通过激发 光引发自由基链式反应。由 PPh3 支持的配合物在 110 °C 下经历可逆的膦离解,生成三配位中间体,该中间体经历缓慢的还原消除。这些过程是定量的,并且非常有利于 Cyl-I 还原消除而不是 Cyl- 还原消除。