Treatment of 2,7-diazabiphenylene with thiophosgene in the presence of barium carbonate and water gives the cyclobutapyridine derivative (8) which was shown by 1H n.m.r. spectroscopy to undergo spontaneous configurational change.
R. Hull, J. A. H. MacBride, M. Wardleworth and P. M. Wright, J. Chem. Soc., Chem. Commun., 1983, 74 DOI: 10.1039/C39830000074
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