A selection of divalent compounds (1, 3, 4, 5, 6 and 7) were tested as catalyst precursors in the polymerization of ε-caprolactone and/or L-lactide which resulted in high molecular weight polymers with PDIs of 1.11–2.81 and 1.13–1.56 for ε-caprolactone and L-lactide respectively. All polymerization studies were performed in either toluene or THF and at room temperature (ε-caprolactone) or 70 °C (L-lactide)
二阵列的处理(
酚)中文2大号X L X = [(- OC 6 H ^ 2(2,4-R)(6-CH 2))2 NCH 2 CH 2 X],其中X = CH 2 NMe 2,NMe 2,NEt 2,OMe,R = Bu t,Pe t,其中Pe t = C(CH 3)2 Et}与[Ln(N(SiMe 3)2)2(THF)2](Ln为
镱,
钐)以1:在己烷中,得到的新的二价
镧系元素的双(
酚盐)复合物的大量1的摩尔比:[L 2C的Yb] 2(X = NET 2,R =卜吨)1,[ L 2b Yb] 2(X = CH 2 NMe 2,R = Bu t)2,[L 3a Yb] 2(X = NMe 2,R = Pe t)3,[L 3b Yb] 2(X = OMe, R = Pe t)4,[L 2c Sm](X = NEt 2,R = Bu t)5,[L 3c Yb](X = NEt 2,R = Pe t)6,[L