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標題: Synthesis, characterization, and catalysis of mixed-ligand lithium aggregates, excellent initiators for the ring-opening polymerization of L-lactide
作者: Ko, B.T.
Lin, C.C.
關鍵字: epsilon-caprolactone;anionic-polymerization;tert-butoxide;2,2-dimethyltrimethylene carbonate;immortal polymerizations;poly(lactic acid);stannous octoate;lactones;butyllithium;alkoxides
Project: Journal of the American Chemical Society
期刊/報告no:: Journal of the American Chemical Society, Volume 123, Issue 33, Page(s) 7973-7977.
Three novel mixed-ligand lithium aggregates, [(mu3-EDBP)Li(2)](2)[(mu (3)-(n)Bu)Li(0.5Et(2)O)](2) (1), E(mu (3)-EDBP)Li(2)](2)[(mu (3)-OBn)Li](2) (2), and [(mu (3)-EDBP)Li(2)](2)[(mu3-OCH(2)CH(2)OCH(2)CH(3))Li](2) (3), have been synthesized and structurally characterized. The reaction of 2,2 ' -ethylidene-bis(4,6-di-tert-butylphenol) (EDBP-H(2)) with 3.6 molar equiv of (n)BuLi gives 1 in high yield. 1 further reacts with benzyl alcohol and 2-ethoxyethanol respectively to yield the corresponding products 2 and 3. Experimental results show that 2 and 3 efficiently initiate the ring-opening polymerization of L-lactide in a controlled fashion, yielding polymers with very narrow polydispersity indexes in a wide range of monomer-to-initiator ratios.
ISSN: 0002-7863
DOI: 10.1021/ja010604i
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