May 1977 431 Oxidation Reactions of 3,4,5-Triamino-l,2,6-thiadiazine 1,1-Dioxide. Preparation of 3,5-Diamino-4H-l,2,6-thiadiazin-4-one 1,1-Dioxide G. Garc'ui-Muüozf, С. Ochoa andM. Stud Instituto de Química Medica, Juan de la Cierva, 3, Madrid-6, Spain Received January 3,1977 Oxidation reactions of 3,4,5-triamino-I ,2,6-thiadiazine 1,1-dioxide with hydrogen peroxide and chromium trioxide are reported. 3,5-Diamino-4H-l,2,6-thiadiazin-4-one 1,1-dioxide is syn- ...