3-Aryl-4-amino-5-thiol-1,2,4 triazoles were condensed with 2, 4-dichlo
rophenoxyethylacy isothiocyanate to obtain 10 novel s-triazolo[3,4-b]-
1,3,4-thiadiazoles 3(a-j) in moderate yield. Their structures were con
firmed by elementary analysis, IR, H-1 NMR and MS. The possible mechan
ism of this reaction was also discussed.