Cyclopentanone enol content

Most of these methods are unable to distinguish between enol and another fast-reacting species and, as stressed by Dubois and Barbier, results are highly dependent on the purity of the carbonyl compound. Another procedure which apparently does not suffer the same drawback was more recently suggested by Bell and Smith and was applied to cyclopentanone and cyclohexanone (Bell and Smith, 1966) and to acetophenone (Novak and Loudon, 1977) ketone solutions were pretreated with bromine and the enol content was measured by potentiometry after allowing the enol to form. This method was also used for determining the acidity constants of ends. 

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