University of British Columbia, Department of Chemistry, 2036 Main Mall, Vancouver, B.C., Canada.
Dalton Trans. 2012 Jul 14;41(26):8123-34. doi: 10.1039/c2dt30148b. Epub 2012 Apr 5.
Functionalized diaminophenols, H(N(R1R2)N(R3)O), were investigated as ligands for indium catalysts in the ring-opening polymerization of racemic lactide. Precursor complexes (N(Me2)N(Me)O)InCl(2) (1), (N(Pr2)NO)InCl(2) (2), and (N(Mes)NO)InCl(2) (3) were synthesized and fully characterized by (1)H and (13)C NMR spectroscopy, elemental analysis, and single-crystal X-ray crystallography. Complexes 1 and 2 were used to synthesize alkoxy-bridged complexes (N(Me2)N(Me)O)InCl(μ-Cl)(μ-OEt) (4) and (N(Pr2)NO)InCl(μ-Cl)(μ-OEt) (5). These complexes catalysed the polymerization of racemic lactide at different rates, with complex 5 being substantially more active than complex 4. The dissociation behaviour of these catalysts in the presence of lactide was also studied and used to make comparisons with previously reported catalyst systems.
功能化二氨基苯酚，H(N(R1R2)N(R3)O)，被研究作为铟催化剂在消旋丙交酯开环聚合中的配体。前体配合物 (N(Me2)N(Me)O)InCl(2) (1)、(N(Pr2)NO)InCl(2) (2) 和 (N(Mes)NO)InCl(2) (3) 通过 (1)H 和 (13)C NMR 光谱、元素分析和单晶 X 射线晶体学进行了全面表征。配合物 1 和 2 用于合成烷氧基桥联配合物 (N(Me2)N(Me)O)InCl(μ-Cl)(μ-OEt) (4) 和 (N(Pr2)NO)InCl(μ-Cl)(μ-OEt) (5)。这些配合物在不同的速率下催化了丙交酯的聚合，其中配合物 5 的活性明显高于配合物 4。还研究了这些催化剂在丙交酯存在下的离解行为，并与以前报道的催化剂体系进行了比较。
