The title mesomeric betaine 1 is formed by a novel thermal cyclisation method; its X-ray crystal structure, that of its 3-bromo derivative, and its reactions with acids, bases and electrophiles are reported.
A. J. Blake, H. McNab, M. Morrow and H. Rataj, J. Chem. Soc., Chem. Commun., 1993, 840 DOI: 10.1039/C39930000840
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