The invention relates to a novel method for producing dithiine tetracarboximides of the general formula (I), where R<1> and R<2> have the meanings given above, characterized in that succinic acid monoamides of the formula (VI), where R is R<1> or R<2>, is reacted with an excess of thionyl chloride, optionally in the presence of a thinner, the excess of thionyl chloride is subsequently removed, and the product mixture thus obtained is transformed into the dithiine tetracarboximide of the formula (I) in a second state in an organic solvent.