Photochemical cycloadditions of 1,3-dioxoles to anisole

Abstract
Anisole yields both ortho- and meta-cycloadducts upon irradiation in the presence of 1,3-dioxole and 2,2-dimethyl-1,3-dioxole. The mode and the regio- and stereo-selectivities of these cycloadditions are rationalized on the basis of the exciplex–zwitterion mechanism.

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