Two series of ligand precursors [2-OH-3-(CH2NR2)-5-MeC6H2]2CH2 (1: NR2 = NMe2; 2: NR2 = N(CH2)4; 3: NR2 = N(CH2)5; 4: NR2 = N(Me)Ph) and [2-OH-3-(CHNR)-5-MeC6H2]2CH2 (10: R = 2,6-Pri2C6H3; 11: R = p-MeC6H4; 12: R = p-ClC6H4; 13: R = p-MeOC6H4; 14: R = But) were prepared. These compounds reacted with AlMe3 to afford corresponding dinuclear aluminum complexes [AlMe22-O-3-(CH2NR2)-5-MeC6H2}]2CH2 (6: NR2 = NMe2; 7: NR2 = N(CH2)4; 8: NR2 = N(CH2)5; 9: NR2 = N(Me)Ph) and [AlMe22-O-3-(CHNR)-5-MeC6H2}]2CH2 (15: R = 2,6-Pri2C6H3; 16: R = p-MeC6H4; 17: R = p-ClC6H4; 18: R = p-MeOC6H4; 19: R = But). All the compounds were characterized by 1H and 13C NMR spectroscopy and elemental analyses. Complexes 6 and 16 were additionally characterized by single crystal X-ray diffraction techniques. Catalysis of the aluminum complexes towards the ring-opening polymerization of rac-lactide was evaluated in the presence of benzyl alcohol. All the polymerization reactions proceed in a controlled manner.
两个系列的
配体前体[2-O
H-3-( NR2)-5-MeC6H2]2 (1:NR2 = NMe2;2:NR2 = N(
CH2)4;3:NR2 = N( )5;4:NR2=N(Me)Ph)和[2-O
H-3-(CHNR)-5-MeC6H2]2 (10:R=2,6-Pri2C6H3;11:R=p-MeC6H4;12:R=p-ClC6H4;13:R=p-MeOC6H4;14:R=But)。这些化合物与 AlMe3 反应生成相应的双核
铝配合物 [AlMe22-O-3-( NR2)-5-MeC6H2}]2 (6:NR2 = NMe2;7:NR2 = N( )4;8:9: NR2 = N(Me)Ph) 和 [AlMe22-O-3-(CHNR)-5-MeC6H2}]2 (15: R = 2,6-Pri2C6H3; 16: R = p-MeC6H4; 17: R = p-ClC6H4; 18: R = p-MeOC6H4; 19: R = But)。所有化合物都通过 1H 和 13C NMR 光谱及元素分析进行了表征。此外,还利用单晶 X 射线衍射技术对络合物 6 和 16 进行了表征。在
苯甲醇存在下,评估了
铝络合物对 rac-内
酰胺开环聚合反应的催化作用。所有聚合反应都以受控方式进行。