title: Large N-heteroacenes: new tricks for very old dogs?
abstract: Azaacenes have been known for a very long time, either as N,N'-dihydro compounds or in their oxidized form as 4n+2π systems, but only recently have processable and charcterizable derivatives been sought. In the last three years synthetic routes to large N-heteroacenes have been developed. In particular, the Pd-catalyzed coupling of aromatic diamines with activated aromatic dihalogenides has enabled simple access to numerous new azaacenes. Since 2010, azapentacene and stabile oligoazahexacene have been synthesized, as well as a symmetrical tetraazapentacene, which acts as an excellent electron-transport material for thin-film transistors.
authors: Organisch-Chemisches Institut, Ruprecht-Karls-Universität, Im Neuenheimer Feld 270, 69120 Heidelberg, Gemany. uwe.bunz@oci.uni-heidelberg.de
authors: Uwe H F
authors: UH
authors: Bunz
authors: Jens U
authors: JU
authors: Engelhart
authors: Benjamin D
authors: BD
authors: Lindner
authors: Manuel
authors: M
authors: Schaffroth