Electrophilic substitution of thetert-butyl-NNO-azoxy group by the bromine atom
作者:A. E. Frumkin、A. M. Churakov、V. A. Tartakovsky
DOI:10.1007/bf02494857
日期:1999.11
The electrophilic substitution of thetert-butyl-NNO-azoxy group by the bromine atom was observed for the first time when 6-bromo-2,4-bis(tert-butyl-NNO-azoxy)-5-chloro-1,3-phenylenediamine was treated with bromine in AcOH. The structural factors promoting this reaction are discussed. The direction of the replacement was confirmed by PM3 calculations of the heats of formation of intermediate cationic
Synthesis of 1,2,3,4-Tetrazino[5,6-<i>f</i>]benzo-1,2,3,4-tetrazine 1,3,7,9-Tetra<i>-N</i>-oxides
作者:Aleksandr E. Frumkin、Aleksandr M. Churakov、Yuri A. Strelenko、Vadim V. Kachala、Vladimir A. Tartakovsky
DOI:10.1021/ol990713q
日期:1999.9.1
[GRAPHICS]The novel heterocyclic system 10 with the phenanthrene type skeleton, in which the benzene ring is annulated with two 1,2,3,4 tetrazine 1,3 di-N-oxide rings, is of considerable interest in the context of the high nitrogen system stability and from a heteroaromaticity standpoint. The step by step synthetic approach to this system involves treatment of 5 with N2O5, resulting in the first 1,2,3,4 tetrazine 1,3 dioxide ring formation, The following displacement of the chlorine atom at the 6-position with ammonia and subsequent repeated treatment with N2O5 results in the second 1,2,3,4 tetrazine 1,3 dioxide ring formation. The structure of 10 was confirmed by a C-13 and N-14 NMR Study.