Steric Structure of L-Proline Oligopeptides. IV. Proton Magnetic Resonance Studies of L-Proline Oligopeptides

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The NMR spectra of t-amyloxycarbonyl-L-proline oligopeptides were measured and compared with those of two poly-L-prolines, I and II. The α-CH resonance peaks of the oligopeptides were observed at sheilding values of 5.2 and 5.4 ppm, values which were in accord with those of the α-CH resonance peaks of the poly-L-prolines I and II, respectively. The behavior of the α-CH peaks was related to the conformation of the L-proline oligopeptides. Moreover, the contribution of the two terminal L-proline residues to the α-CH resonance peaks was discussed.
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