Polyglycine and polyalanine obtained by polymerization of their N‐carbonic anhydrides often appeared to contain more acid groups than amino groups. This is ascribed, at least partly, to the formation of hydantoin groups. A small amount of 2,5‐diketopiperazine was isolated from polyglycine. A discussion of the results and their bearing upon the calculation of molecular weights is given.
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Sluyterman et al. (1954) studied this question.
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