Photocatalytic ring opening of α-epoxyketones by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) in acetone resulted in the diastereoselective formation of 1,3-dioxolanes through C α -O bond cleavage. The facility of the ring opening is influenced by the nature and the location of the additional substituent on the α-epoxyketones.
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