The cyclometallated complexes [MCl(C⁁N)(ring)] (HC⁁N = 2-phenylpyrazole, M = Ir, Rh ring = Cp*; M = Ru, ring = p-cymene) readily undergo insertion reactions with RCCR (R = CO2Me, Ph) to give mono insertion products, the rhodium complex also reacts with PhCCH regiospecifically to give an analogous product. The products of the reactions of the cyclometallated imine complexes [MCl(C^N)Cp*] (HC⁁N = PhCHNR, R = Ph, CH2CH2OMe, Me; M = Ir, Rh) with PhCCPh depend on the substituent R; when R = CH2CH2OMe a monoinsertion is observed, however for R = Me the initial insertion product is unstable, undergoing reductive elimination with loss of the organic fragment, and for R = Ph no metal-containing product is isolated. With PhCCH the cyclometallated imine complexes can give mono or di-insertion products. The implications for catalytic synthesis of carbo- and heterocycles by a tandem C–H activation, alkyne insertion mechanism are discussed.
环
金属化配合物 [MCl(C⁁N)(环)](HC⁁N = 2-苯基
吡唑,M = Ir,Rh 环 = CP*;M = Ru,环 =
对伞花烃)很容易与 RCCR 进行插入反应( R = CO2Me, Ph) 得到单插入产物,
铑配合物也与 PhCCH 区域特异性反应,得到类似的产物。环
金属化
亚胺配合物 [MCl(C^N)CP*] (HC⁁N = PhCHNR, R = Ph, CH2CH2OMe, Me; M = Ir, Rh) 与 PhCCPh 的反应产物取决于取代基 R;当 R = CH2CH2OMe 时,观察到单插入,然而,对于 R = Me,初始插入产物不稳定,经历还原消除并损失有机片段,而对于 R = Ph,没有分离出含
金属产物。与PhCCH一起,环
金属化
亚胺络合物可以得到单插入或双插入产物。讨论了串联 C-H 活化、炔插入机制催化合成碳环和杂环的影响。