SCHEDULED MAINTENANCE
Photocyclization of β-alkoxy-ketones can give tetrahydrofuranols and cyclobutanols viaδ- or γ-hydrogen abstraction, respectively: the occurrence of δ-hydrogen abstraction via a seven-membered transition state is attributable to the enhanced stability of the resulting α-oxalkyl radical.
P. Yates and J. M. Pal, J. Chem. Soc. D, 1970, 553 DOI: 10.1039/C29700000553
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