On conversion of the helical poly-(γ-benzyl L-glutamate) in chloroform–trifluoracetic acid into the random coil form, the 13C spectrum shows an upfield displacement of 3·0 p.p.m. for the α carbon and 2·7 p.p.m. for the amide carbon.
L. Paolillo, T. Tancredi, P. A. Temussi, E. Trivellone, E. M. Bradbury and C. Crane-Robinson, J. Chem. Soc., Chem. Commun., 1972, 335 DOI: 10.1039/C39720000335
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