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13 C NMR spectra of pyridinium betaines and related compounds
Author(s) -
Takeuchi Yoshito,
Dennis Nicholas
Publication year - 1976
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.1270080107
Subject(s) - pyridinium , chemistry , spectral line , hydroxide , nmr spectra database , oxide , proton , proton nmr , decoupling (probability) , chemical shift , inorganic chemistry , medicinal chemistry , stereochemistry , organic chemistry , physics , quantum mechanics , astronomy , control engineering , engineering
13 C NMR spectra of 1‐methyl‐, 1‐phenyl‐ and 1, 6‐dimethyl‐pyridinium‐3‐oxide, 3‐methylphthalazinium 1‐oxide and anhydro‐3‐methanesulphonamido‐1‐methylpyridinium hydroxide, together with the corresponding amines and quaternary salts, were determined with and without proton noise‐decoupling. The assignment of resonances was based on the analysis of the fine splitting pattern caused by long range couplings whenever appropriate. A procedure for the estimation of chemical shifts of the salts and betaines is proposed.