Photoaddition of aromatic ketones to some arylacetylenes; Formation of α,β‐unsaturated ketones and aldehydes

Abstract
Photoaddition of aromatic ketones to 1‐alkyl‐2‐phenylacetylenes RCCC6H5 (R = CH3, C2H5) generally affords, via an oxete derivative, α,β‐unsaturated ketones Ar2CC(C6H5)COR in good or moderate yield.With monosubstituted arylacetylenes Ar′CCH α,β‐unsaturated aldehydes Ar2CC(Ar′)CHO are formed.In the reactions with 9‐xanthenone partial dehydrocyclization of the adducts occurs.

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