Nitrogen NMR sudies of some 15N labelled sydnones and related stuctures |
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Authors: | L Stefaniak M Witanowski B Kamieski G A Webb |
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Institution: | L. Stefaniak,M. Witanowski,B. Kamieński,G. A. Webb |
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Abstract: | 15N NMR studies on some signly labelled sydnones, N-acetylsydonimines and their hydrochlorides, as well as those on some sydnonimine hydrochlorides, show that in each case protonation takes place at the exocyclic moiety, \documentclass{article}\pagestyle{empty}\begin{document}$ - {\rm O}^ \ominus - \mathop {\rm N}\limits^ \ominus {\rm COCH}_3 \,{\rm or}\, - \mathop {{\rm NH}}\limits^ \ominus $\end{document} , respectively. Complete assignments of the nitrogen chemical shifts are possible for the labelled compounds, including the isomeric structures of N-alkyl–N-cyanomethyl–N–nitrosoamines to which, unstable, free sydnonimines are converted. |
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