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Membrane-based TBADT recovery as a strategy to increase the sustainability of continuous-flow photocatalytic HAT transformations

Author

Listed:
  • Zhenghui Wen

    (University of Amsterdam)

  • Diego Pintossi

    (University of Amsterdam)

  • Manuel Nuño

    (Fornham St Genevieve, Bury St Edmunds)

  • Timothy Noël

    (University of Amsterdam)

Abstract

Photocatalytic hydrogen atom transfer (HAT) processes have been the object of numerous studies showcasing the potential of the homogeneous photocatalyst tetrabutylammonium decatungstate (TBADT) for the functionalization of C(sp3)–H bonds. However, to translate these studies into large-scale industrial processes, careful considerations of catalyst loading, cost, and removal are required. This work presents organic solvent nanofiltration (OSN) as an answer to reduce TBADT consumption, increase its turnover number and lower its concentration in the product solution, thus enabling large-scale photocatalytic HAT-based transformations. The operating parameters for a suitable membrane for TBADT recovery in acetonitrile were optimized. Continuous photocatalytic C(sp3)-H alkylation and amination reactions were carried out with in-line TBADT recovery via two OSN steps. Promisingly, the observed product yields for the reactions with in-line catalyst recycling are comparable to those of reactions performed with pristine TBADT, therefore highlighting that not only catalyst recovery (>99%, TON > 8400) is a possibility, but also that it does not happen at the expense of reaction performance.

Suggested Citation

  • Zhenghui Wen & Diego Pintossi & Manuel Nuño & Timothy Noël, 2022. "Membrane-based TBADT recovery as a strategy to increase the sustainability of continuous-flow photocatalytic HAT transformations," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33821-9
    DOI: 10.1038/s41467-022-33821-9
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    References listed on IDEAS

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    1. Ian B. Perry & Thomas F. Brewer & Patrick J. Sarver & Danielle M. Schultz & Daniel A. DiRocco & David W. C. MacMillan, 2018. "Direct arylation of strong aliphatic C–H bonds," Nature, Nature, vol. 560(7716), pages 70-75, August.
    2. John J. Murphy & David Bastida & Suva Paria & Maurizio Fagnoni & Paolo Melchiorre, 2016. "Asymmetric catalytic formation of quaternary carbons by iminium ion trapping of radicals," Nature, Nature, vol. 532(7598), pages 218-222, April.
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    Cited by:

    1. Hao Yang & Jinhui Xu & Hui Cao & Jie Wu & Dan Zhao, 2023. "Recovery of homogeneous photocatalysts by covalent organic framework membranes," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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