Calcium 2,5-diketo-D-gluconate (1), prepared by microbial oxidation of D-glucose, reacts with methyl-and aryl-hydrazines to give N-methyl- and -aryl-5-oxidopyridazinium derivatives (2a–g), respectively.
K. Imada, J. Chem. Soc., Chem. Commun., 1973, 796 DOI: 10.1039/C39730000796
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