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Intermolekulare [2+2]‐Photocycloadditionen sind die vielseitigsten und am breitesten anwendbaren Reaktionen der Photochemie. Es gelang nun zum ersten Mal, solche Reaktionen durch Verwendung eines chiralen Triplett‐Sensibilisators mit hoher Enantioselektivität (bis zu 92 % ee) durchzuführen. Die niedrige Katalysatorbeladung (2.5–5 Mol‐%) belegt die hohe Effektivität des Prozesses sowohl bezüglich der...
Thioxanthone 1, which was synthesized in a concise fashion from methyl thiosalicylate, exhibits a significant absorption in the visible light region. It allows for an efficient enantioselective catalysis of intramolecular [2+2] photocycloaddition reactions presumably by triplet energy transfer.
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