Photochemical syntheses of 2,6-dioxabicyclo[3.2.0]heptanes
Abstract
Photocycloaddition of carbonyl compounds to dihydrofurans gives 2,6-dioxabicyclo[3.2.0]heptanes with high orientational selectivity; other examples of the same ring system can be produced by u.v. irradiation of β-vinyloxy-ketones.