Premium
Nitrogen‐15 nuclear magnetic resonance spectroscopy. Natural abundance nitrogen‐15 spectra of the cis and trans isomers of secondary alkylformamides
Author(s) -
Nakanishi Hiroshi,
Roberts John D.
Publication year - 1981
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/mrc.1270150103
Subject(s) - formamides , chemistry , chemical shift , substituent , cis–trans isomerism , nitrogen , abundance (ecology) , nuclear magnetic resonance spectroscopy , spectroscopy , spectral line , computational chemistry , nuclear magnetic resonance , stereochemistry , organic chemistry , formamide , physics , astronomy , biology , quantum mechanics , fishery
The 15 NMR chemical shifts were measured of a number of N ‐substituted formamides and acetamides at the natural abundance level. The ratios of the cis and trans isomers for several N ‐alkylformamides were also determined. Substituent effects on the 15 N chemical shifts of formamides are compared with those of some other nitrogen‐containing compounds. There is a consistent pattern of behavior of the one bond spin–spin coupling constants [ 1 J ( 15 NH)] wherein the trans isomers of N ‐alkylformamides are larger than those of the cis isomers.