Synthesis of β-Poly-α-ethyl-L-aspartate

Abstract
A simple procedure is described for the preparation of N-carboxy-L-aspartic anhydride α-esters, and the confirmation of the six-membered ring by i.r. and n.m.r. spectroscopic studies. The polymerization of N-carboxy-α-ethyl-L-aspartate to the corresponding β-poly-α-ethyl-L-aspartate is also described.

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