FIELD: chemistry.
SUBSTANCE: present invention relates to a novel method of producing dithiine-tetracarboximides of general formula 
wherein R1 and R2 assume values given above, characterised by that at the first step monoamides of succinic acid of formula 
wherein R denotes R1 or R2, react with excess thionyl chloride, optionally in a diluent medium, followed by removal of excess thionyl chloride, and the obtained product mixture, at the second step in the medium of an organic solvent, is converted into dithiine-tetracarboximides of formula (I). The invention also relates to intermediate compounds of formula 
and a method for production thereof.
EFFECT: novel method of producing dithiine-tetracarboximides.
9 cl, 18 ex
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