Diazapentacenes from Quinacridones.

Bis(silylethynylated) 5,7- and 5,12-diazapentacenes were synthe-sized from cis- and trans-quinacridone using protection, alkynylation and deoxygenation. The solid-state packing of the targets is determined by choice and position of the silylethynyl substituents. The position of the substituents and nitrogen atoms influence the optical properties of the targets.