Solid-state [2+2] photodimerization of eniminium salts: stereoselective syntheses of 1,3-diacetylcyclobutanes

Chem. Commun., 2024, 60,9821-9824 DOI: 10.1039/D4CC03691C, Communication Shinji Yamada, Yuka Honda Eniminium salts arranged in the head-to-tail orientation through cation–π interactions are useful for stereoselective 1,3-diacetylcyclobutane synthesis via solid-state photodimerization.