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Updated: Feb 13, 2026

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Published on: June 13, 2025
Synthesis and Structure of a Propeller-Shaped Polycyclic Aromatic Hydrocarbon Containing Seven-Membered Rings
Kazuya Kawai1, Kenta Kato1, Lingqing Peng2
1Graduate School of Science , Nagoya University , Chikusa, Nagoya 464-8602 , Japan.
Abstract:
The synthesis and structure of a C3-symmetric propeller-shaped polycyclic aromatic hydrocarbon that bears three seven-membered rings is reported. The synthesis was accomplished in three steps from benzo[ c]naphtho[2,1- p]chrysene, including a Pd-catalyzed intramolecular C-H arylation for the formation of the seven-membered rings. The combination of the helicities ( P/ M) of the three seven-membered-ring moieties and three [4]helicene moieties affords 24 possible conformers, and two relatively stable conformations were observed by 1H NMR spectroscopy.
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