NITROPYRAZOLES .4. N-AMINATION UNDER CONTROL OF THE PH OF THE MEDIUM

Citation
Vm. Vinogradov et al., NITROPYRAZOLES .4. N-AMINATION UNDER CONTROL OF THE PH OF THE MEDIUM, Russian chemical bulletin, 42(8), 1993, pp. 1369-1371
Citations number
13
Categorie Soggetti
Chemistry
Journal title
ISSN journal
10665285
Volume
42
Issue
8
Year of publication
1993
Pages
1369 - 1371
Database
ISI
SICI code
1066-5285(1993)42:8<1369:N.NUCO>2.0.ZU;2-9
Abstract
A preparative method of N-amination of pyrazoles bearing nitro groups and other electron withdrawing substituents in the pyrazole ring with hydroxylamine-O-sulfonic acid involving control of the pH of the mediu m has been elaborated. A series of previously unknown pyrazoles has be en prepared. Basicities (pK(BH+)) of 1-aminopyrazole and 1-amino-4-nit ropyrazole have been measured and differences between the basicities o f the C- and N-amino groups for the pyrazole series have been revealed .