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標題: Preparation and characterization of bisphenolato magnesium derivatives: an efficient catalyst for the ring-opening polymerization of epsilon-caprolactone and L-lactide
作者: Shen, M.Y.
Peng, Y.L.
Hung, W.C.
Lin, C.C.
關鍵字: chelating diaryloxo ligands;cyclic esters;titanium complexes;metal-complexes;aluminum complexes;rac-lactide;bis(phenolate);catalysts;immortal polymerization;aminophenolate ligands;coordination;chemistry
Project: Dalton Transactions
期刊/報告no:: Dalton Transactions, Issue 44, Page(s) 9906-9913.
A series of magnesium complexes have been prepared and characterized, in which [(EDBP-Me) Mg(mu-OBn)](2) (4) has shown high activity toward the ring-opening polymerization (ROP) of epsilon-caprolactone and L-lactide. 2,2'-Ethylidene-bis(4,6-di-tert-butylphenol)-monomethyl ether ([EDBP-(Me)H]) is prepared by the reaction of 2,2'-ethylidene-bis(4,6-di-tert-butylphenol) (EDBP-H(2)) with dimethyl sulfate. The reaction of [EDBP-(Me)H] with (n)Bu(2)Mg yields [(EDBP-Me)Mg(n)Bu](2), which further reacts with benzyl alcohol and N,N-dimethylethylenediamine giving complexes [(EDBP-Me)Mg(mu-OBn)](2) (4) and {[EDBP(Me)]Mg(mu-Me(2)NCH(2)CH(2)NH)}(2) (5), respectively. Experimental results indicate that the activity of complex 4 toward cyclic esters is higher than that of [(mu-EDBP)Mg](2)/(BnOH).
ISSN: 1477-9226
DOI: 10.1039/b912443h
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