Synthesis of some naphthylazosulphur compounds structurally related to certain antibilharzial drugs

The synthesis of 5,5'-Bis[4-(N-mono and disubstituted aminoethylamino)-naphthylazo]-2.2'-dipyridyldisulphides has been achieved by the coupling of 2.2'-dipyridyldisulphide-5.5'-tetrazonium chloride with different N-mono and N.N-disubstituted N'-1-naphthylethylenediamines.