SCHEDULED MAINTENANCE
Atropisomeric 3,4-dihydro-2-pyridones undergo stereospecific [2+2]-photocycloaddition in solution with high stereoselectivity (ee > 98% and de > 96%) in the product. The chiral transfer during phototransformation was rationalized based on the stability/reactivity of the biradical.
![Graphical abstract: Light-induced stereospecific intramolecular [2+2]-cycloaddition of atropisomeric 3,4-dihydro-2-pyridones](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C2CC37123E&imageInfo.ImageIdentifier.Year=2013)
E. Kumarasamy and J. Sivaguru, Chem. Commun., 2013, 49, 4346 DOI: 10.1039/C2CC37123E
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