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.
Source:
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 301