Abstract
Cuprate addition to 2-t-butyl-2,6-dimethyl-1,3-dioxin-4-one ( 3 results in exclusive attack from the top face (side opposite the t-butyl group) of the molecule while photoaddition of 3 with cyclohexene or the ethylene ketal of 2-cyclohexenone gives exclusively adducts formed by reaction on the bottom face of the substrate.
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