Photochemical process leading to the formation of cyclobutanols from excited carbonyl compounds by intramolecular γ-hydrogen abstraction (Norrish Type II photoreaction) and subsequent 1,4-diradical combination.
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Source:
PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 375 (https://doi.org/10.1351/pac200779030293)