Triazolo-thiadiazines 4a–f and triazolo-tetrazines 8g–l were prepared from reaction of 3-(4-amino-5-mercapto-4H-1,2,4-triazol-3-yl)-2H-chromen-2-one with the respective hydrazonoyl halides 2a–f 2g–l. Moreover, aminomercaptotriazole derivative phenacyl bromide ethyl 2-chloro-3-oxobutanoate followed by coupling products benzenediazonium chloride yielded corresponding 4f 8g, respectively. All newl...