Photocycloaddition of carbonyl compounds to dihydrofurans gives 2,6-dioxabicyclo (3.2.01heptanes with high orientational selectivity ; other examples of the same ring system can be produced by U.V. irradiation of pvinylox y-ketones.
The /%allyloxy-ketones (1) and (6) undergo cyclisation on U.V. irradiation to yield the 2-alkenyl-3-R3 R' hydroxytetrahydrofurans cyclisation of the aldehyde (2), (12) (3), and has (7)-(10) been used ; similar in a
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