The dioxinone is subjected to UV or visible light irradiation. The light energy promotes a [2+2] photocycloaddition reaction. In this step, the double bond within the dioxinone ring adds to another double bond within the molecule, forming a new cyclic structure. This newly formed ring contains four carbons, giving rise to a tetrahydrofuranone or tetrahydropyranone core.
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Ethyl vinyl ether
Allyl triflate
3
Piperidine, 1-[(5-oxo-1-cyclopenten-1-yl)carbonyl]- (9CI)
Toluene
5,5-dimethyl-3-(2-vinylidenehexylamino)cyclohex-2-enone
3(2H)-Azocinone, hexahydro-1-(phenylmethyl)-
N-benzyl-N-(3-oxocyclohex-1-enyl)pent-4-enamide
3-(4,5-heptadienyl)-4-methyl-2-cyclohexen-1-one
3-iodo-2-methylbenzyl methoxymethyl ether
3-(2-methoxyethoxy)phenol
