ISSN:
1040-0397
Keywords:
1-nitropyrazole
;
reduction mechanism
;
polarography
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Reduction of 1-nitropyrazole (I) results in acidic media in a cleavage of the N—N bond and formation of nitrous acid which is further reduced at more negative potentials. At pH 〉 4 a competitive reduction of the nitramine to nitrosamine occurs. Four-electron reduction of nitro derivatives of pyrazolium (II) and (III) and imidazolium (IV) and (V) salts results in a formation of a hydroxylamine derivative. The reduction follows the scheme: H+, e, e, H+, 2e, 2H+. In the reduction product the azolium ring is reduced at more negative potentials. Whereas the effect of pyrazolium and imidazolium rings on the reducibility of the nitro group is comparable, the interaction between the nitro group and the azolium ring markedly depends on the position of the nitro group on the ring.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140040809
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