The carbonyl form is sometimes more stable than the enol form in solution. For linear carbonyls the predominate form is the carbonyl . If we form an aromatic ring the predominate form is the enol  多重下拉选择题

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Tautomerization from a keto to an enol form proceeds through two proton transfer steps facilitated by the solvent. Which statement(s) below explain why the carbonyl oxygen is not protonated by the same proton lost by the α-carbon. (i.e. why is a single-step, intramolecular proton transfer disfavored).

Which of the following is the most stable enol tautomer of 1,3-cyclohexanedione?

We can convert between enols and carbonyls in at any pH .

The process of conversion between a carbonyl and an enol is called _____________________.

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