Sulfonamide-Supported Aluminum Catalysts for the Ring-Opening Polymerization of<i>rac</i>-Lactide
作者:Andrew D. Schwarz、Zengyong Chu、Philip Mountford
DOI:10.1021/om901070g
日期:2010.3.8
intramolecular hydrogen bonding between the sulfonyl oxygens and the amine protons. Compounds 19, 21, 22−27, and 29−33 are all catalysts for the ROP of rac-lactide, with the alkoxide compounds 22−27 and 32 giving well-defined molecular weights and molecular weight distributions. These compounds were also active in the melt at 130 °C, giving atactic poly(rac-lactide) with moderate to narrow PDIs and extremely good
报道了多种磺酰胺负载的烷基铝和醇盐铝配合物的合成,结构和开环聚合(ROP)能力。新的质子配体PhCH 2 N(CH 2 CH 2 NHSO 2 R)2(R = Tol(15,H 2 N 2 Ts N Ph)或Me(16,H 2 N 2 Ms N Ph)的合成描述。这些和先前报道的1,2-C 6 H 10(NHSO 2 R)2(R = Tol(11,H 2 CyN 2 Ts)或Mes(12,H 2 CyN 2 SO 2 Mes))和RCH 2 N(CH 2 CH 2 NHSO 2 Tol)2(R = MeOCH 2(13,H 2 N 2 Ts N OMe)或2-NC 5 H 4(14,H 2 N 2 Ts N py))与AlEt 3反应形成Al(CyN 2 Ts)Et(THF)(17),Al(CyN 2 SO 2 Mes)Et(THF)(18)和Al(N 2 Ts N R)Et(R = Ph(19),OMe(20)或py