Usually, the keto form is more stable than the enol.

Another way to look at ascorbic acid is to consider it as an enol.

Nonetheless, the enol form is important for some reactions.

The formation of an enol is catalyzed by acid or base.

The enol and keto forms are said to be tautomers of each other.

The second is the reaction of an enol acetate with methyllithium.

When an enol reacts with an electrophile, however, only the initial addition step is the same.

In this example there are two different reactions which afford the enol as a transient intermediate.

It can exist at least in two tautomeric forms, keto and enol.

The less common tautomer is the enol form.

At the time of this correct assignment, it was suggested that the enol form was not dominant.

For example, a typical enol reaction consists of at least these elementary steps:

The enol form is a vinylogous analogue of a carboxylic acid.

Usually the enol is the minority tautomer, but it is more reactive.

In the next step the enol orthoester is hydrolyzed to produce the ketone '.

It is one of the simplest enol ethers.

Two simple enol ethers are methyl vinyl ether and 2,3-dihydrofuran.

His studies strongly suggest that the catalyst generates the enol, and forms an enol-catalyst complex.

Like many other carbonyl compounds, acetaldehyde tautomerizes to give the enol.

This test was not specific to acetylsalicylic acid but would occur in the presence of any phenol or enol.

The enol form is more energetically stable in the solid phase and in solution.

Phenol therefore exists entirely in the enol form.

It has been used for the preparation of α-fluoroketones from silyl enol ethers.

Alternatively, the enol (below right) and ion forms are complementary to guanine.

This is because a carbonyl is in tautomeric resonance with an enol.