
%0 Journal Article
%A Barlin, GB 
%A Brown, DJ 
%A Fenn, MD 
%T Carbon-13 nuclear magnetic resonance spectra in the identification of N-, O or S-methyl derivatives of some tautomeric hydroxy and mercapto nitrogen heterocycles
%J Australian Journal of Chemistry
%D 1984/11/01
%V 37
%N 11
%P 2391-2395
%K 
%R https://doi.org/10.1071/CH9842391
%U https://www.publish.csiro.au/paper/CH9842391 
%X Carbon-13 nuclear magnetic resonance spectroscopy, in contrast to 1H n.m.r. spectroscopy, has been shown to provide a clear distinction in a variety of nitrogen heterocyclic systems between O-methyl and nuclear N-methyl groups. Methoxy groups were found to occur in the range &#948; 53.20-61.87, nuclear N-methyl groups at 34.29-49.62, and methylthio groups at 12.35-14.55 for the compounds examined in (D)chloroform. Data for N- and O-methyl derivatives of pyridin-2- and -4-ol,* the corresponding pyrimidines, and some sulfur analogues have been compared with those for the unmethylated parent compounds. 
