The invention relates to heterocyclic compounds, in particular to 2,5bis (4-aminophenylthio) -1,3,4-thiadiazole or 2,5bis (4-aminophenylsulfonyl) -1,3,4-thia diazole which may find use as light stabilizers of cellulose acetate. The goal - the creation of new compounds, are more active. Preparation lead condensation of equimolar amounts of 2,5-dimercapto-1,3,4-thiadiazole-4-halo- nitrobenzene in a medium of an amide solvent, followed by reducing the obtained dinitro compounds. Yield,% m.p., & amp; deg; C.. Gross-p-la: a) 85; & Amp; deg; 25-227; Ci4HtzN4S3. b) 85; 191-193; SschNiM ZzO. The novel compounds are more effective than the prior art 2, 6-digidroksifeniltio - 1,3,4-thiadiazole. Table 1.
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