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A Persistent Diazaheptacene Derivative

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journal contribution
posted on 29.10.2014, 00:00 by Jens U. Engelhart, Olena Tverskoy, Uwe H. F. Bunz
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.

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