Method for Catalyzing Lactide Polymerization Using Dinuclear Chiral Aminoimine Magnesium Complex
A technology of amine imine magnesium and complexes, which is applied in the field of catalytic lactide polymerization, can solve problems such as metal residues, and achieve the effects of low cost, controllable molecular weight, and simple treatment
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Embodiment 1
[0037] The structural formula of the ligand used is the above formula (A), where R is hydrogen, and the reaction process is as follows: under a nitrogen atmosphere, slowly add 5 mL of benzyl alcohol tetrahydrofuran solution (2.0 mol / L) to an equimolar amount of Mg ( n Bu) 2 Hexane solution (2.0 mol / L, 5 mL) was reacted for 1 hour, 2.14 g of the ligand was dissolved in 25 mL of dry toluene, and added to Mg( n Bu) 2 In the reaction mixture with benzyl alcohol, after adding, the reaction liquid was naturally raised to room temperature, and then heated to 60 ° C for 3 hours. After the reaction was completed, the solvent was vacuum-dried, and the residue was washed with dry n-hexane, filtered, and then the product was collected and dried. Weighed to obtain 3.05 g of solid, the yield was 83.4%.
Embodiment 2
[0039] The structural formula of the ligand used is the above formula (A), where R is methyl, and the reaction process is as follows: under a nitrogen atmosphere, slowly add 5 mL of benzyl alcohol tetrahydrofuran solution (2.0 mol / L) to an equimolar amount at -10°C Mg( n Bu) 2 Hexane solution (2.0 mol / L, 5 mL) was reacted for 1 hour, 2.64 g of the ligand was dissolved in 25 mL of dry toluene, and added to Mg( n Bu) 2 and benzyl alcohol reaction mixture, after adding, the reaction liquid was naturally raised to room temperature, and then heated to 40 ° C for 10 hours, after the reaction was completed, the solvent was vacuum-dried, and the residue was washed with dry n-hexane, filtered, and then the product was collected and dried Weighed to obtain 3.33 g of solid, the yield was 84.5%.
Embodiment 3
[0041] The structural formula of the ligand used is the above formula (A), where R is ethyl, and the reaction process is as follows: under a nitrogen atmosphere, slowly add 5 mL of benzyl alcohol THF solution (2.0 mol / L) to an equimolar amount at -10°C Mg( n Bu) 2 Hexane solution (2.0 mol / L, 5 mL) was reacted for 1 hour, 2.92 g of the ligand was dissolved in 30 mL of dry toluene, and added to Mg( n Bu) 2 In the reaction mixture with benzyl alcohol, after the addition, the reaction liquid was naturally raised to room temperature, and then heated to 50°C for 6 hours. After the reaction was completed, the solvent was vacuum-dried, and the residue was added to dry n-hexane to filter and washed with dry n-hexane. , the product was collected and dried and weighed to obtain 3.66 g of solid, with a yield of 86.6%.
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