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Synlett
DOI: 10.1055/a-2772-4490
Letter

Photochemical synthesis of 7,14-dialkynyl-10,11-dimethyl[5]helicene via flow chemistry and comparison with its bromo analog

Authors

  • Anselm Uhlmann

    1   Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany (Ringgold ID: RIN9174)

  • Jacques Guyon

    1   Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany (Ringgold ID: RIN9174)

  • Daniel B. Werz

    1   Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany (Ringgold ID: RIN9174)
Further Information
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A flow photoreactor for the photochemical synthesis of substituted [5]helicenes from corresponding distilbenes is described. This method allows to circumvent scale limitations often associated with such reactions due to the high dilutions required. Additionally, reaction times can be significantly reduced by utilizing flow conditions. The syntheses of both, a known bromo-substituted helicene and a novel alkynyl-substituted helicene are compared for both, batch and flow.



Publication History

Received: 30 October 2025

Accepted after revision: 12 December 2025

Accepted Manuscript online:
15 December 2025

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