SYNTHESIS, STRUCTURE AND BIOLOGICAL-ACTIVITY OF 3,7-DINITRODIBENZOBROMONIUM SALT

3,7-Dinitrodibenzobromonium bisulfate 3 was prepared directly by the r eaction of 4,4'-dinitrobiphenyl with sodium bromide and potassium pers ulfate in the concentrated sulphuric acid. Metathetical reactions of 3 gave 3,7-dinitrodibenzobromonium chloride 4, bromide 5 and iodide 6, respectively. Crystal structure of 3a obtained by crystallization of 3 in formic acid showed that each molecule of 3a consists of two dibenz obromonium ions, two bisulfate anions and a formic acid. The dibenzobr omonium ion is nearly coplanar. Compound 3 can dramatically increase m ice's immunofunction.