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Low‐temperature 15 N NMR spectra of reduced 1,3‐heterocyclic systems
Author(s) -
Takeuchi Yoshito,
Crabb Trevor A.
Publication year - 1983
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/omr.1270210313
Subject(s) - conformational isomerism , chemistry , pyridine , thiazine , spectral line , nitrogen , nmr spectra database , crystallography , molecule , medicinal chemistry , organic chemistry , physics , astronomy
The 15 N NMR spectra of the O ‐inside cis ‐fused conformer of perhydropyrido[1,2‐ c ][1,3]thiazine shows a shielding of the nitrogen of 23.0 ppm relative to the trans ‐fused conformer. In contrast, 15 N shifts for the cis ‐and trans ‐fused conformers of perhydro‐oxazolo[3,4‐ a ]pyridine and perhydrothiazolo[3,4‐ a ]pyridine show corresponding shieldings of only 0.6 and 2.5 ppm, respectively.