We report a continuous flow approach generating bicyclic cyclobutanes from unactivated alkenes in a metal-free manner that is inspired by the Kochi–Salomon reaction. A filtered Hg-lamp in combination with a simple flow set-up and acetone as UV light-absorbing co-solvent are crucial for this method thus showcasing attractive features for further exploitations.
![Graphical abstract: Metal-free [2+2]-photocycloaddition of unactivated alkenes enabled by continuous flow processing](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=D4CC06000H&imageInfo.ImageIdentifier.Year=2025)
D. O’Hanlon, S. Davin, B. Glennon and M. Baumann, Chem. Commun., 2025, 61, 1403 DOI: 10.1039/D4CC06000H
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