PRODUCTION OF 2,6-(4,4'-DIAMINO-DIPHENYL)BENZO(1,2-D:4,5-D')BISTHIAZOLE

摘要

PURPOSE:To obtain the present substance as a raw material for aromatic heterocyclic polymers in high purity by reacting a diaminobenzenedithiol.dihydrochloride with p-aminobenzoic acid using a mixture containing methanesulfonic acid and phosphorus pentoxide as a reaction medium. CONSTITUTION:2,5-Uiamino-1,4-benzenedithiol.dihydrochloride is reacted with p-aminobenzoic acid using a mixture containing methanesulfonic acid and phosphorus pentoxide as a reaction medium to afford the objective compound expressed by the formula. Furthermore, the mixing ratio of the methanesulfonic acid to the phosphorus pentoxide is preferably (20/1)-(5/1) weight ratio.