Direct Observation of Acetophenone Enol Formed by Photohydration of Phenylacetylene

The photohydration of phenylacetylene yields acetophenone enol as a transient primary product which was detected by flash photolysis. The identification of the transient intermediate rests on a quantitative comparison of its decay kinetics with that of authentic acetophenone enol generated by Norrish type-II photoelimination from γ-hydroxybutyrophenone in aqueous HCl and aqueous AcOH buffer solutions.

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