Preparation and characterization of bisphenolato magnesium derivatives: an efficient catalyst for the ring-opening polymerization of epsilon-caprolactone and L-lactide.
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).
Shen
Min-Yi
MY
Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan, Republic of China.
Peng
Ya-Liu
YL
Hung
Wen-Chou
WC
Lin
Chu-Chieh
CC
D002208:Caproates / Q000737:chemistry*; D002384:Catalysis; D018360:Crystallography, X-Ray; D004146:Dioxanes / Q000737:chemistry*; D007783:Lactones / Q000737:chemistry*; D008024:Ligands; D008274:Magnesium / Q000737:chemistry*; D015394:Molecular Structure; D011108:Polymers / Q000138:chemical synthesis*
D002208:Caproates; D004146:Dioxanes; D007783:Lactones; D008024:Ligands; D011108:Polymers; C121056:caprolactone; C091880:dilactide; D008274:Magnesium