Abstract
The possible tautomeric equilibria of benzofuroxan and its sulphur and selenium analogues were examined by multinuclear NMR methods. The 1H, 13C, 14N and 15N NMR signal assignments were achieved largely by 2D methods and some older nitrogen NMR data were verified. At room temperature and above, only unsubstituted benzofuroxan exhibits tautomeric exchange fast on the NMR time-scale. All remaining compounds exist in this condition as N → O structures. Copyright © 1999 John Wiley & Sons, Ltd.
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