Halogenation reactions. The successful synthesis of the basic heterotriacene structures 5 and 6 allowed for the investigation of possible follow-up reactions in order to widen the scope of corresponding derivatives. Since there is a restricted number of publications describing reactivities of triacenes, we studied electrophilic substitution, metallation, and redox reactions on dithienopyrazines 5 and 6 and compared reactivities, regioselectivities, and product spectrum.