首页 | 本学科首页   官方微博 | 高级检索  
     


Ring‐opening polymerization of substituted ε‐caprolactones with a chiral (salen) AlOiPr complex
Authors:Mark R. Ten Breteler  Zhiyuan Zhong  Pieter J. Dijkstra  Anja R. A. Palmans  Joris Peeters  Jan Feijen
Affiliation:1. Institute for Biomedical Technology, Polymer Chemistry and Biomaterials Group, Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;2. Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513,5600 MB Eindhoven, The Netherlands;3. Institute for Biomedical Technology, Polymer Chemistry and Biomaterials Group, Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The NetherlandsInstitute for Biomedical Technology, Polymer Chemistry and Biomaterials Group, Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Abstract:The ring‐opening polymerization (ROP) of ε‐caprolactone (ε‐CL), 4‐methyl‐ε‐caprolactone (4‐MeCL), and 6‐methyl‐ε‐caprolactone (6‐MeCL) with a single‐site chiral initiator, R,R′‐(salen) aluminum isopropoxide (R,R′‐[1]), was investigated. The kinetic data for the ROP of the three monomers at 90° in toluene corresponded to first‐order reactions in the monomer and propagation rate constants of kε‐CL > k4‐MeCL ? k6‐MeCL. A notable stereoselectivity with a preference for the R‐enantiomer was observed in the ROP of 6‐MeCL with R,R′‐[1], whereas for 4‐MeCL, no stereoselectivity was found. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 429–436, 2007.
Keywords:lactones  polyesters  ring‐opening polymerization  salen complex  stereoselectivity  stereospecific polymers
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号