The preparation of some sequential polypeptides by the p-Nitrophenyl ester method

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Abstract
A number of sequential polypeptides have been obtained by polymerization of peptide p-nitrophenyl esters. The majority of the products contained γ-ethyl-L-glutamyl and S-benzyl-L-cysteinyl residues in various proportions. The active ester monomers were synthesized by the mixed carbonic anhydride procedure using p-nitrophenyl as a carboxyl-protecting group. Some of the limitations of this approach are discussed.

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