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15N NMR spectroscopy 12:—steric effects in diastereomeric oligopeptides of alanine, phenylalanine and valine

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

Publisher: John Wiley and Sons
Year: 1979
Tongue: English
Weight: 414 KB
Volume: 12
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1270121102

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✦ Synopsis

Abstract

Eight pairs of diastereomeric di‐, tri‐, and tetrapeptides were prepared from alamine, phenylalanine, valine and glycine. Their natural abundance ^15^N NMR spectra were measured in a 1:1 mixture of acetone/dimethyl sulphoxide and in all eight cases the diastereomers could be distinguished without the aid of shift reagents. The shift difference between the signals of diastereomers is dependent on the nature of the amino acid and on the solvent.

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15N NMR spectroscopy. 23—Shift effects o

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

✍ Hans R. Kricheldorf; William E. Hull 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 381 KB

## 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~^−^