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Biocatalytic Synthesis of Polyesters by Enzyme-Catalyzed Transesterification in Organic Media

Published online by Cambridge University Press:  21 February 2011

Cary J. Morrow
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
J. Shield Wallace
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
Gregory M. Bybee
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
Kristin B. Reda
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
Mark E. Williams
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
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Abstract

Enzyme-catalyzed preparation of polymers offers several potentially valuable advantages over the usual polymerization procedures. This paper summarizes our successful use of lipase-catalyzed polycondensations to prepare both a series of achiral [AA-BBJx polyesters from simple bis(2,2,2- trichloroethyl) alkanedioates and diols and of an optically active, epoxy-substituted polyester having a stereochemical purity estimated to be greater than 96%, from racemic bis(2,2,2-trichloroethyl) trans- 3,4-epoxyhexanedioate and 1,4-butanediol. The somewhat less successful polycondensation of a series of A-B monomers is also described. All of the reactions were carried out at ambient temperature in anhydrous, low to intermediate polarity, organic solvents such as ether, THF, and methylene choride, using porcine pancreatic lipase (PPL) as the catalyst. Possible explanations for the difference between the A-B and AA + BB cases, based on NMR analysis of the reactions' progress are considered.

Type
Research Article
Copyright
Copyright © Materials Research Society 1990

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