The preparation is described of 6- and 7-chlorofurazanobenzofuroxan. Each exists as a mixture of two tautomeric forms at room temperature and these were identified by n.m.r. spectroscopy. Attempts to interconvert the two isomers thermally were unsuccessful.
A. J. Boulton, A. C. G. Gray and A. R. Katritzky, J. Chem. Soc. B, 1967, 909 DOI: 10.1039/J29670000909
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