Synthesis,1H,13C,14N, and15N NMR spectra, and cathodic behavior of N-chloro-1,2,4-triazoles
摘要:
Syntheses are reported for N-chloro-1,2,4-triazoles and the NMR spectra of these compounds were studied. An investigation was also carried out on a platinum electrode in 0.1 N Bu4ClO4 in acetonitrile. The reduction proceeds with the transfer of two electrons and the formation of triazole and chloride ions. The half-wave potentials of the reduction of N-chlorotriazoles correlates well with the pK(a) values of the corresponding NH-acids. The electrochemical reduction of N-chlorotriazoles is accompanied by the reaction of N-chlorotriazole with the chloride ion formed on the cathode, which leads to the NH form of 1,2,4-triazole through a series of chemical steps.
A series of 5-substituted 3-nitro-1-vinyl-1,2,4-triazoles were synthesized by alkaline treatment of the corresponding 1-(2-haloethyl- or 2-nitroxyethyl)-3-nitro-1,2,4-triazoles and by transvinylation of NH acids of the same series with vinyl acetate. The scope of applicability of the transvinylation procedure was established with respect to the azole pK(a) value. The vinylic double bond on the nitrogen was shown to be inactive toward both nucleophilic and electrophilic reagents, whereas the halogen atom in position 5 exhibits enhanced reactivity. The latter factor provides the possibility for versatile structural modification via nucleophilic replacement of the 5-halogen atom by various groups, including triazolate ion.
A number of 5-R-substituted 3-nitro-1-trinitromethyl-1H-1,2,4-triazoles (R = Me, Cl, Br, N(3), NH(2), NO(2)) were synthesized by nitration of the corresponding omega-(5-R-3-nitro-1H-1,2,4-triazol-1-yl)alkan-2-ones with mixtures of concentrated sulfuric and nitric acids.
PEVZNER M. S.; KULIBABINA T. N.; MALININA L. A., XIMIYA GETEROTSIKL. SOEDIN., 1979, HO 4, 555-557
作者:PEVZNER M. S.、 KULIBABINA T. N.、 MALININA L. A.
DOI:——
日期:——
PEVZNER M. S.; KULIBABINA T. N.; IOFFE S. L.; MASLINA I. A.; GIDASPOV B. +, XIMIYA GETEROTSIKL. SOEDIN., 1979, HO 4, 550-554
作者:PEVZNER M. S.、 KULIBABINA T. N.、 IOFFE S. L.、 MASLINA I. A.、 GIDASPOV B. +