Thermodynamically unstable enols (1) are of interest as primary products of Norrish Type II cleavage of ketones—butyrophenone in this case—in alkaline solution. Since (1) quickly forms the enolate, which is only slowly protonated to the ketone (2), it is possible to measure the pK value directly by flash photolytic “titration” (pK = 10.34 ± 0.05)
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Haspra et al. (1979) studied this question.
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