The synthesis and characterisation of constrained geometry scandium and aluminium permethylindenyl complexes ^Me2SB(^RN,I*)ScCl(THF) (R = ⁱPr (1), ⁿBu (2) and Ph (3)), ^Me2SB(^iPrN,I*)Sc(O-2,6-ⁱPr-C₆H₃)(THF) (4), ^Me2SB(^iPrN,I*)Sc(O-2,4-^tBu-C₆H₃)(THF) (5), ^Me2SB(^nBuN,I*)Sc(O-2,6-ⁱPr-C₆H₃)(THF) (6), ^Me2SB(^PhN,I*)Sc(O-2,6-ⁱPr-C₆H₃)(THF) (7), ^Me2SB(^tBuN,I*)AlCl(THF) (8), ^Me2SB(^tBuN,I*)Al(O-2,6-Me-C₆H₃)(THF) (9) and ^Me2SB(^tBuN,I*)Al(O-2,4-^tBu-C₆H₃)(THF) (10) are reported. All complexes were characterised by NMR spectroscopy. Solid-state structures of 2–4, 6 and 8–10 were determined by X-ray crystallography. Ring-opening polymerisation of L- and rac-lactide using all complexes with the exception of 6 show first-order dependence on monomer concentration and produced polylactide with unimodal molecular weight distribution. First-order dependence on catalyst concentration was determined from L-lactide polymerisation using 4 and 9. Moderately heterotactic polylactide (P_r = 0.53–0.68) was achieved from rac-lactide polymerisation using 4, 5, 7 and 9. The effects of the metal centre (Sc and Al), the amido substituent (ⁱPr, ^tBu, ⁿBu and Ph) and the aryloxide initiating group (O-2,6-Me-C₆H₃, O-2,6-ⁱPr-C₆H₃ and O-2,4-^tBu-C₆H₃) on the catalytic activity are discussed.

中文翻译：

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使用scan和铝全甲基茚基配合物进行L-和rac-丙交酯聚合

约束几何geometry和全甲基茚满铝配合物^Me2 SB（^R N，I *）ScCl（THF）（R = ⁱ Pr（1），ⁿ Bu（2）和Ph（3）），^Me2 SB（^{i Pr} N，I *）Sc（O-2,6- ⁱ Pr-C ₆ H ₃）（THF）（4），^Me2 SB（^{i Pr} N，I *）Sc（O-2,4- ^t Bu- C ₆ H ₃）（THF）（5），^Me2 SB（^{n Bu}N，I *）Sc（O-2,6- ⁱ Pr-C ₆ H ₃）（THF）（6），^Me2 SB（^Ph N，I *）Sc（O-2,6- ⁱ Pr-C ₆ H ₃）（THF）（7），^Me2 SB（^{t Bu} N，I *）AlCl（THF）（8），^Me2 SB（^{t Bu} N，I *）Al（O-2,6-Me-C ₆ H ₃）（THF）（9）和^Me2 SB（^{t Bu} N，I *）Al（O-2,4- ^t Bu-C ₆ H ₃）（THF）（10）报告。所有配合物通过NMR光谱表征。的固态结构2-4，6和8至10，用X射线晶体学确定。使用除6以外的所有配合物，L-和rac-丙交酯的开环聚合反应显示出对单体浓度的一阶依赖性，并产生具有单峰分子量分布的聚丙交酯。一阶依赖于催化剂浓度由L-丙交酯聚合反应使用4和9确定。rac获得中等杂规聚乳酸（P _r = 0.53–0.68）丙交酯的聚合用4，5，7和9。金属中心（Sc和Al），酰胺基取代基（ⁱ Pr，^t Bu，ⁿ Bu和Ph）和芳​​基氧化物引发基团（O-2,6-Me-C ₆ H ₃，O-2，讨论了6 - ⁱ Pr-C ₆ H ₃和O-2,4- ^t Bu-C ₆ H ₃）对催化活性的影响。