Abstract
Oxygen-17 was introduced into leucine, proline, phenylalanine and tyrosine. The corresponding tert-butyloxycarbonyl amino acids were first converted to their O-methyl esters. Following saponification with Na 17OH, the tert- butyloxycarbonyl group was removed to yield free amino acid enriched with oxygen-17 by approximately 1000-fold. Oxygen-17 NMR revealed well-resolved peaks for the labelled amino acids. The chemical shifts are reported.
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