The reactions of 3-nitro-4-R-furazans with ammonia were studied. The effect of the substituent R on the specific features of the nucleophilic substitution reaction observed was considered. The nitro group attached to the furazan ring can act as both the leaving group and the activating group facilitating the displacement of the second substituent (for example, OR' or N(NO2)R').
Two approaches to the synthesis of bis-3,3'-(nitro-NNO-azoxy)difurazanyl ether 2 have been tested, that is, varying the sequence of the introduction of the nitro-NNO-azoxy group and ether bridge. Difurazanyl ether formation through base-promoted transformation of nitrofurazans has been studied in which the nitro groups were activated by ortho electron-withdrawing substituents such as nitro-NNO-azoxy and tert-butyl-NNO-azoxy groups. The nitro-NNO-azoxy group was formed by destructive N-nitration of the tert-butyl-NNO-azoxy group. The X-ray crystal structure of 2 is reported.
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作者:A. B. Sheremetev、E. V. Mantseva、D. E. Dmitriev、F. S. Sirovskii
DOI:10.1023/a:1015820318686
日期:——
The reactions of 4,4'-dinitrodifurazanyl ether 1 with Na salts of hydroxyfurazans 2a-e were studied. The nitrofurazanyl fragment is replaced by the more nucleophilic R-furazanyl group; the observed transetherification affords unsymmetrical derivatives of difurazanyl ether. The ratio of the rate constants for the successive reaction steps was determined.
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作者:A. B. Sheremetev、V. O. Kulagina、I. A. Kryazhevskikh、T. M. Melnikova、N. S. Aleksandrova
DOI:10.1023/a:1020931511013
日期:——
The reactions of 3-nitro-4-R-furazans with ammonia were studied. The effect of the substituent R on the specific features of the nucleophilic substitution reaction observed was considered. The nitro group attached to the furazan ring can act as both the leaving group and the activating group facilitating the displacement of the second substituent (for example, OR' or N(NO2)R').
Sheremetev; Kharitonova; Mantseva, Russian Journal of Organic Chemistry, 1999, vol. 35, # 10, p. 1525 - 1537