SCHEDULED MAINTENANCE
Reaction of 2-methyl-3-methylamino-4-nitro-5-phenylimino-2,5-dihydroisothiazole (1b) with cyanide ion proceeds with two successive sequences of ring-opening and ring-closure with the ultimate generation of 2,5-bis(methylamino)-4-nitro-3-phenylimino-3H-pyrrole (2b) or its tautomer (2a).
S. Rajappa, B. G. Advani, G. Kartha and H. Hartloff, J. Chem. Soc., Perkin Trans. 1, 1983, 1953 DOI: 10.1039/P19830001953
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