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DOI: 10.1055/sos-SD-037-00246

Griesbeck, A. G.; Sokolova, T.Science of Synthesis, (200837448.

The [2+2] photocycloaddition of a carbonyl compound to an alkene or alkyne is termed the PaternòBüchi reaction and has been studied in detail and reviewed several times.[‌70‌‌73‌] As evidenced by the diversity of carbonyl compounds and unsaturated substrates suitable for inter- and intramolecular photocycloaddition, this photochemical route is the most productive for oxetane formation.