as high for CL polymerization; [CL] : [USCl-Al] : [BnOH] = 100 : 0.5 : 2; [USCl-Al] = 10 mM, conv. = 90% after 15 min at 25 °C). Regardless of whether aluminum amidates or ureidates were present, thioligands improved the polymerization rate of aluminum catalysts. Density functional theory calculations revealed that the eight-membered ring [SPr-AlOMe2]2 decomposed into the four-membered ring SPr-AlOMe2
在本研究中,合成了一系列带有酰胺化物、
硫代酰胺化物、
脲化物和
硫脲化物的铝配合物,并评估了它们对
ε-己内酯(CL)聚合的催化活性。S Pr -Al表现出比O Pr -Al更高的催化活性(CL 聚合活性高 3.2 倍;[CL] : [ S Pr -Al ] : [BnOH] = 100 : 0.5 : 2;[ S Pr -Al ] = 10 mM,25 °C 14 分钟后转化率 = 93%),US Cl -Al表现出比U Cl -Al更高的催化活性(CL 聚合活性高 4.6 倍;[CL] : [ US Cl - Al ] : [BnOH] = 100 : 0.5 : 2;[ US Cl -Al ] = 10 mM,25 °C 15 分钟后转化率 = 90%。无论是否存在酰胺化铝或
脲化物,
硫配体都提高了铝催化剂的聚合速率。密度泛函理论计算表明,八元环[S Pr -AlOMe 2 ] 2分解为四元环S