2,2'-DIALKOXY, 2,2'-DIHYDROXY, AND 2,2'-DIAMINO DERIVATIVES OF 1,1'-AZOBENZIMIDAZOLE. THE FIRST SYNTHESIS OF HETEROCYCLIC TETRAZENES BY MEANS OF A NUCLEOPHILIC SUBSTITUTION REACTION

Article abstract of DOI:10.1007/BF00473934

2,2'-Dimethanesulfonyl-1,1'-azobenzimidazole is prepared by the oxidation of 1-amino-2-methanesulfonylbenzimidazole with lead tetraacetate.The reaction of this tetrazene with alkali in DMSO, with sodium alkoxides in the corresponding alcohol or ammonia, or with primary or secondary amines leads to the formation of 2,2'-dihydroxy, 2,2'-dialkoxy, or 2,2'-diamino derivatives of 1,1'-azobenzimidazole.