Abstract
C-Substituted maleimides 2, 4, 6 are thiated with the reagent 1 in toluene or xylene. Monothiation at the nonequivalent carbonyl groups occurs in a regiospecific way. Maleimides 2, 4 with 4-methylphenyl or dialkylamino groups are attacked on the carbonyl function which is far from the C-substituent and give the monothiocompounds 3 and 5. The thiation of maleimides 6a- 6b with NH-groups on the double bond primary occurs on the neighbouring carbonyl group in the neigh-bourhood. 7a and 7b further react to the violet dithiomaleimides 8. 6d gives the monothio compound 9 with an exocyclic CS-goups.
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