| The HFQ is unsubstituted at nitrogen in position 1, so that tautomerism can take place. |
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| This is tautomerism, where two isomers exist in dynamic equilibrium with each other. |
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| The P-diketone structure can undergo keto-enol tautomerism in solutions. |
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| In addition to keto-enol tautomerism, several other types are well known, including those of aliphatic nitro compounds and those involving ring and chain structures, especially of molecules of sugars. |
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| Among specific topics thus investigated were the rate of hydrogen ion formation through dissociation in water, diffusion-controlled protolytic reactions, and the kinetics of keto-enol tautomerism. |
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| Because of tautomerism, xanthines such as caffeine appear to have phenolic structure, but the preferred chemical structure in xanthines is the ketone. |
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| Tautomerism, the existence of two or more chemical compounds that are capable of facile interconversion, in many cases merely exchanging a hydrogen atom between two other atoms, to either of which it forms a covalent bond. |
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| Tautomerism is chemical isomerism characterized by relatively easy interconversion of isomeric forms in equilibrium. |
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