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The mechanism proposed earlier for explanation of the furoxan ring formation in the nitrosation of dipotassium salts of 1-hydroxyimino-2,2-dinitro-1-R-ethanes with NaNO2/AcOH was confirmed experimentally by determining the ionization constants of the dinitromethyl and oxime fragments in the starting dipotassium salt and by examining 1H, 13C, 14N, and 15N NMR and mass spectra of isomeric 3(4)-nitro-4(3)-R-furoxans...
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