Constrained geometry scandium permethylindenyl complexes for the ring-opening polymerisation of <scp>l</scp>- and <i>rac</i>-lactide
作者:Nichabhat Diteepeng、Jean-Charles Buffet、Zoë R. Turner、Dermot O'Hare
DOI:10.1039/c9dt03450a
日期:——
The synthesis and characterisation of constrained geometry scandium permethylindenyl chloride, aryloxide and borohydride complexes Me2SB(tBuN,I*)Sc(Cl)(THF) (1), Me2SB(tBuN,I*)Sc(O-2,6-iPr-C6H3)(THF) (2), Me2SB(tBuN,I*)Sc(O-2,4-tBu-C6H3)(THF) (3) and Me2SB(tBuN,I*)Sc(BH4)(THF) (4) are reported. The activity of complexes 1–4 as initiators for the ring-opening polymerisation (ROP) of L- and rac-lactide
约束几何构象scan甲基过甲基茚基氯,芳基氧化物和硼氢化物的配合物Me 2 SB(t Bu N,I *)Sc(Cl)(THF)(1),Me 2 SB(t Bu N,I *)Sc( O-2,6- i Pr-C 6 H 3)(THF)(2),Me 2 SB(t Bu N,I *)Sc(O-2,4- t Bu-C 6 H 3)(THF) )(3)和Me 2 SB(t Bu N,I *)Sc(BH 4报道了(THF)(4)。介绍了配合物1-4作为L-和rac-丙交酯开环聚合(ROP)引发剂的活性。使用配合物2和3的L-和rac-丙交酯的ROP表现出对单体浓度的一阶依赖性,并分别生成了等规聚丙交酯(PLA)和中等等规PLA(P r = 0.68–0.72)。PLA(M n)的实验和理论分子量与相对窄的分散度(M w / M n)之间的良好一致性。<1.20)。配合物4对L-和rac-丙交酯的ROP活