Revisions of Structural Assignments for l-Methyl-(3 and 5)-amino-4-nitropyrazoles and Related Compounds

Abstract

Amino proton chemical shifts recorded for the compounds described as 5-amino-1-methyl-4-nitropyrazole and the 3-amino isomer (3) are inconsistent with charge densities calculated from simple H.m.o. treatments.Unequivocal synthesis of 5-amino-1-methyl-4-nitropyrazole from 5-amino-1-methylpyrazole proves that the assignments should be interchanged; the structures of compounds derived from these amino-nitropyrazoles are revised accordingly.