The aroylhydrazides were prepared by esterification and hydrazinolysis of corresponding aromatic carboxylic acids.The reaction of aroylhydrazides with CS2/KOH in absolute ethanol gave potassium aroyldithiocarbazates and then hydrazinolysis of potassium aroyldithiocarbazates with hydrazine hydrate afforded 3-aryl-4-amino-5-mercapto-1,2,4-triazoles(1a～1g).New seven compounds of bis[(3-aryl)-s-triazolo[3,4-b]-[1,3,4]thiadiazole derivatives(2a～2g) were synthesized in high yields by cyclization of nonanedioic acid with 3-aryl-4-amino-5-mercapto-1,2,4-triazoles(1a～1g).The structures of 2a～2g were confirmed by elementary analyses,IR,1H NMR,and MS spectra.The preliminary antibacterial tests showed that most of them had good antibacterial activities.
