title: A persistent diazaheptacene derivative.
abstract: We describe the synthesis of characterizable diazaheptacene derivatives. Diazaheptacenes need four silylethynyl protecting groups to be isolable. TIPS-ethynyl groups are not bulky enough to allow stabilization. Four Si(sec-Bu)3-ethynyl groups symmetrically attached to the acene core sufficiently protect the formed diazaheptacene from dimerization through Diels-Alder reaction. It was characterized by NMR and UV-vis spectroscopies and cyclic voltammetry.
authors.affiliation: Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
authors.forename: Jens U
authors.initials: JU
authors.lastname: Engelhart
authors.forename: Olena
authors.initials: O
authors.lastname: Tverskoy
authors.forename: Uwe H F
authors.initials: UH
authors.lastname: Bunz