Several new derivatives of dibenzo-p-dioxin have been prepared while studying the directive influence of bromo and nitro substituents. Those chemically identified are 2-bromo- 7-nitro-, 2-bromo-7-amino-, 2, 7-diacetamido-, 2, 7-dibromo-and 2, 3, 7, 8-tetranitrodibenzo- p-dioxin. Infrared spectra were used to assign the structures of 2, 3-dibromo-7-nitro-and 2 bromo-3, 7-dinitrodibenzo-p-dioxin. Two compounds were designated as 2, 8-dibromo-3, ...