Well-Defined Aminophenolate Zinc and Magnesium Complexes as Excellent Inhitiators for the ROP of Lactides |
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| Authors: | Jolanta Ejfler S?awomir Szafert Piotr Sobota |
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| Institution: | Department of Chemistry, University of Wroc?aw, F. Joliot-Curie 14, 50-383 Wroc?aw, Poland |
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| Abstract: | A series of molecular homo and heteroleptic zinc and magnesium compounds with aminophenolate ligands (µ,η2-L2)ZnEt]2 ( 1 ), (η2-L2)Zn(µ-BnO)]2 ( 2 ), Zn(η2-L2)2] ( 3 ), Zn(η2-L3)2] ( 4 ), Mg(η2-L3)2] ( 5 ) (L2-H = N-methylene(2-hydroxy-3,5-di-tert-butylphenyl)]-N-methyl-N-cyclohexylamine, L3-H = N-methylene(2-hydroxy-3,5-di-tert-butylphenyl)]-N-methyl-N-methyl-1,3-dioxolaneamine) have been prepared and characterized. The homoleptic complexes 3–5 are most probably a mixture of diastereoisomers that in solution show an interesting dynamics which plays an important role in their catalytic behavior. The complexes 2 – 5 are efficient initiators in ring-opening polymerization (ROP) of lactides to produce polymers with desired molecular weight and narrow polydispersity. |
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| Keywords: | aminophenolates lactides magnesium polymerization zinc |
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