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15N NMR spectroscopy. 23—Shift effects of protecting groups in oligopeptides of glycine and alanine

✍ Scribed by Hans R. Kricheldorf; William E. Hull

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
381 KB
Volume
13
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The natural abundance ^15^N NMR spectra of glycylglycine and alanylalanine derivatives with various N‐ or O‐protecting groups were measured in dimethyl sulphoxide, pyridine and fornic acid. The nitrogens directly attached to the protecting group have chemical shifts relative to NO~3~^−^ in the range −220 to −358 ppm. The influence of the amino end group on the next peptide nitrogen (Gly‐Gly bond) amounts to, at most, 1.7 ppm. The influence of the O‐protecting group is also weak (Δ δ⩽2 ppm), but strongly dependent on the solvent.

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