Journal
CHEMICAL COMMUNICATIONS
Volume 53, Issue 28, Pages 4030-4033Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cc01300k
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Funding
- NSF Division of Materials Research Biomaterials (BMAT) Program [1508422]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1508422] Funding Source: National Science Foundation
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This paper reports that the bulk polymerization of L-aspartic acid diethyl ester catalyzed by immobilized CAL-B at 80 degrees C for 24 h gives primarily (similar to 95%) alpha-linked poly(L-aspartate) in 70% yield with DPavg = 50 and regioselectivity (alpha/beta) = 94: 6. Plots of log{[M](0)/[M](t)} vs. time and DPavg vs. conversion indicate that this polymerization proceeds in a controlled manner by a chain-growth mechanism up to 90% conversion. Thereafter, competition occurs between chain growth and step mechanisms.
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