| 主权项 |
1. Process for preparing a dithiinetetracarboximide of formula (I) in which R1 and R2 are the same or different and are each hydrogen, optionally mono- or poly-halogen-, —OR3—, —COR4-substituted C1-C8-alkyl, optionally mono- or poly-halogen-, -C1-C4-alkyl- or -C1-C4-haloalkyl-substituted C3-C7-cycloalkyl, in each case optionally mono- or poly-halogen-, -C1-C4-alkyl-, -C1-C4-haloalkyl-, —COR4— or -sulphonylamino-substituted aryl or aryl-(C1-C4-alkyl), R3 is hydrogen, C1-C4-alkyl, C1-C4-alkylcarbonyl or optionally mono- or poly-halogen-, -C1-C4-alkyl- or -C1-C4-haloalkyl-substituted aryl, R4 is hydroxyl, C1-C4-alkyl or C1-C4-alkoxy, comprising (1) reacting a succinic monoamide of formula (VI) in which R is R1 or R2 with thionyl chloride to give a reaction mixture, the reaction mixture formed is heated in a second stage (2), and then the reaction mixture is converted to one or more dithiinetetracarboximides in a third stage (3), with continuous performance of at least one of (1), (2) and/or (3) |
