1,3,4-Thiadiazole, 1,3,4-thiadiazine, 1,3,6-thiadiazepane and quinoxaline derivatives from symmetrical hydrazine-1,2-dicarbothioamide as well as N, N″-ethane-1,2-diylbis(thiourea) derivatives

Reactions of N,N′-disubstituted hydrazine-1,2-carbothioamides 8a-c and substituted N,N″-ethane-1,2-diylbis(thioureas) 9a-c with 2,3,5,6-tetrachloro-1,4-benzoquinone (chloranil, 10a) and 2,3,5,6-tetrabromo-1,4-benzoquinone (bromanil, 10b) to form N,N′-disubstituted 1,3,4-thiadiazole-2,5-diamines 11a-c, substituted 3-amino-6,7-dichloro-2,3-dihydro-1H-4,2,1-benzothiadiazine-5,8-diones 12a-c, 2,3,7,8-tetrahalothianthrene-1,4,6,9-tetrones 13a,b, substituted 5,6,8-trihalo-7-oxo-3,7-dihydroquinoxaline-2H-carbothioamides 14a-c, 15a-c and 7-substituted imino-1,3,6-thiadiazepane-2-thiones 16a-c are reported.