Abstract
A relationship was established between the structure of amino-1-methylnitropyrazoles and the first stages of their fragmentation under electron impact, viz., the elimination of NO, NO2, and OH radicals. In contrast to other “ortho” isomers, 4-amino-1-methyl-3-nitropyrazole displays autonomous properties of amino and nitro aromatic compounds as a consequence of weakening of the interaction of the amino and nitro groups along the C(3)-C(4) bond and specific redistribution of the electron density in the pyrazole ring.
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