Applicability of vicinal heteronuclear (13C‐1H, 15N‐1H, 13C‐15N) coupling constants for conformational analysis of amino acids: Phenylalanine, α‐aminobutyric acid and β‐alanine

Abstract

AbstractThe vicinal 13C1H, 15N1H and 13C15N spin coupling constants were obtained from the 1H and 13C NMR spectra of various ionic forms of the amino acids phenylalanine, α‐aminobutyric acid and β‐alanine, and also from their 15N isotopomers. It is concluded that the 13C1H and 15N1H coupling constants are reliable parameters for conformational studies of amino acids, whereas the practical applicability of the 13C15N constants for the same purpose is doubtful.