Helical 6–7–6–6 fused acridiniums were synthesised via oxidative ring contraction of a helical azaheptalene. X-ray, spectroscopic, and theoretical studies revealed highly distorted, configurationally stable helicity with long-wavelength absorption and chiroptical properties. These findings provide a new π-conjugated helical framework for functional chiral materials.
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S. Nakamura, S. Kawaguchi, Y. Nishimura, T. Harimoto, J. Hasegawa, T. Suzuki and Y. Ishigaki, Chem. Commun., 2026, 62, 4268 DOI: 10.1039/D5CC06029J
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