alkene photocycloaddition
Photochemical process leading to formation of a cyclobutane upon addition of an electronically excited alkene to another ground-state alkene or of an electronically excited α,β-unsaturated carbonyl compound to a ground-state alkene. The latter is called a de Mayo reaction.
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PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 301 (