structures of 1, 2, and 4–6 were further confirmed by single-crystal X-ray diffraction studies. Complexes 1, 2, 5, and 6 displayed good catalytic activity toward the ring-opening polymerization (ROP) of ε-caprolactone. In addition, 1, 5, and 6 were also found to be excellent catalysts for making cyclic carbonates from CO2 and epoxides in the presence of a cocatalyst, n-Bu4NBr.
一系列基于a基的N,O螯合
镁配合物[(L 1)2(THF)2 Mg](1),[(L 2)2(THF)2 Mg](2),[(L 3)2(THF)2的Mg](3),和[(大号4)2 Mg的](4)通过处理制备ñ -benzoyl- ñ '-arylbenzamidines(大号1 - 4与0.5当量的二- 1H)ñ丁基
镁在THF中的溶液。使用CH以类似方式制备类似的CH 3 CN配位化合物[(L 1)2(CH 3 CN)2 Mg](5)和[(L 3)2(CH 3 CN)2 Mg](6)。3 CN作为溶剂。所有化合物通过其特征在于1个H / 13 C NMR光谱,和的分子结构1,2,和4 - 6单晶X射线衍射研究进一步证实了这一点。配合物1,2,5,和6显示出良好的催化活性朝向开环聚合ε
己内酯(ROP)。此外,1,5,和6也被发现是用于从CO使环状
碳酸酯的优异催化剂2在助催化剂的存在下和
环氧化物,Ñ