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DOI: 10.1055/a-1482-6190
Pyrimidine-Substituted Hexaarylbenzenes as Versatile Building Blocks for N–Doped Organic Materials
Funding Information Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Projektnummer 364549901–TRR 234 [B2].


Abstract
Hexaarylbenzenes (HABs) are valuable precursors for the bottom-up synthesis of (nano-)graphene structures. In this work the synthesis of several bis-pyrimidine substituted HABs furnished with tert-butyl groups at different sites of the four pendant phenyl rings is reported. The synthetic procedure is based on modular [4 + 2]-Diels–Alder cycloaddition reactions followed by decarbonylation. Analysis of the solid-state structures revealed that the newly synthesized HABs feature a propeller-like arrangement of the six arylic substituents around the benzene core. Here, the tilt of the aryl rings with respect to the central ring strongly depends on the intermolecular interactions between the HABs and co-crystallized solvent molecules. Interestingly, by evading the closest proximity of the central ring using an alkyne spacer, the distant pyrimidine ring is oriented in the coplanar geometry with regard to the benzene core, giving rise to a completely different UV-absorption profile.
Key words
carbon materials - cycloadditions - Diels–Alder reactions - doping - ligand design - N-heterocyclesSupporting Information
Supporting Information for this article is available online at https://doi.org/10.1055/a-1482-6190.
Dedicated to Prof. Dr. Peter Bäuerle in occasion of his 65th birthday.
Publication History
Received: 26 February 2021
Accepted: 03 April 2021
Accepted Manuscript online:
14 April 2021
Article published online:
26 May 2021
© 2021. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)
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