tautomer

The tautomer on the left, featuring a 4-hydroxy group the C4 carbon, is dominant.

Similar in nature to 2-hydroxypyridine, 2-mercaptopyridine converts to the thione tautomer.

Through movement of this hydrogen and electrons, the second tautomer form, 2-hydroxypyridine is formed.

The imide tautomer is dominant, at least in the solid state.

The position of the nitrogen with the hydrogen on it determines how the tautomer is named.

It is the much less stable tautomer of ethenone.

It has a tautomer known as 6-hydroxypurine.

The less common tautomer is the enol form.

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

Attack by water and proton loss converts 5 to 7, which is a tautomer of the final amide.

This occurs because the keto form is, in general, more stable than its enol tautomer.

This should act to decrease the N-1-H tautomer preference.

In this tautomer, the proton resides on the ring nitrogen, not the structure shown above.

The more stable tautomer is the amine oxide form.

The triol tautomer, which may have aromatic character, predominates in solution.

It is the tautomer of an amide.

The main active metabolite is 4-hydroxycyclophosphamide, which exists in equilibrium with its tautomer, aldophosphamide.

The more abundant tautomer trimerizes to give cyanuric acid.

This species exists in equilibrium with a minor tautomer P(OH).

Decreasing substitution at the anionic carbon favors the ketimine tautomer.

It is a tautomer of ethynol.

This ketone will prefer to exist in its enol tautomer in solution.

In solution, the 2H-isoindole tautomer is the predominant form and therefore the compound resembles a pyrrole more than a simple imine.

Its tautomer acetylenediol is unstable.