An air- and moisture-tolerant alternate synthetic pathway to the preparation of a cationic chelated bis(NHC) methylpalladium(ii) complex, [{(MesIm)₂CH₂}Pd(Me)(NCMe)][PF₆], is described. The pathway involves the isolation of a bis(NHC) Ag^I complex, [{(MesIm)₂CH₂}₂Ag₂][PF₆]_2, via metallation of the corresponding diimidazolium salt with Ag₂O followed by carbene transfer to [(COD)PdBrMe]. This new method avoids a previously reported unstable intermediate that displayed rapid decomposition at room temperature, attaining the targeted cationic methylpalladium(ii) complex in high yield. CO/ethylene copolymerisation catalysis trials are reported showing solvent dependent catalyst lifetime and copolymer yields. Preliminary ethylene insertion studies are also outlined revealing possible pathways leading towards catalyst deactivation.

制备阳离子螯合的双（NHC）甲基钯（ii）配合物[{（MesIm）₂ CH ₂ } Pd（Me）（NCMe）] [PF ₆ ]的耐空气和湿气的替代合成途径是描述。该途径包括通过相应的二咪唑鎓盐与Ag _2的金属化分离双（NHC）Ag ^I络合物[{（MesIm）₂ CH ₂ } ₂ Ag ₂ ] [PF ₆ ] _2。O，然后将卡宾转移到[（COD）PdBrMe]中。该新方法避免了先前报道的不稳定中间体，该中间体在室温下显示出快速分解，从而以高收率获得了目标阳离子甲基钯（ii）络合物。据报道，CO /乙烯共聚催化试验显示出取决于溶剂的催化剂寿命和共聚物产率。还概述了初步的乙烯插入研究，揭示了导致催化剂失活的可能途径。