| |
[摘要]：The Suzuki-Miyaura cross-coupling reaction of aryl iodides and bromides with areneboronates, catalyzed by Pd-contg. water-sol. micelles formed by PS-PEO copolymer and N-cetylpyridinium chloride as a surfactant, was studied in H2O and MeOH. The reaction was performed under mild conditions (?0? and the catalyst can be recycled (5 runs) by ultrafiltration without any loss of catalytic activity. The phenomenon was obsd., consisting in growing Pd-nanoparticle size because the small nanoparticles dissolve to form larger nanoparticles in the course of reaction as well as in the presence of the only reagent, aryl iodide. In the latter case, addnl., the formation of very small, not completely dissolved Pd nanoparticles, obviously having a high catalyst activity, is obsd. This observation, together with catalyst activity data might have an implication for a leaching mechanism for the studied catalytic system. |
|
