T. Viljanen et al., COUPLING-CONSTANTS (1)J(N-15,P-31) AS A PROBE FOR THE CONFORMATIONAL EQUILIBRIA OF 2-AMINO-SUBSTITUTED 1,3,2-LAMBDA(5)-OXAZAPHOSPHINAN-2-ONES, Perkin transactions. 2, (6), 1998, pp. 1479-1481
The N-15 NMR spectra of both P(2) diastereomers of the trans-fused hlo
roethyl)amino-3,4,4a,5,6,7,8,8a-octahydro-1,3,2 lambda(5)-benzoxazapho
sphinin-2-ones and their 3-methyl and 3-benzyl derivatives have been m
easured. Depending on the P(2) configuration, the coupling constants (
1)J(N-15,P-31) vary markedly. The applicability of the coupling betwee
n exocyclic nitrogen and phosphorus for determination of the heterorin
g conformation is discussed.