Definition of tautomer in English:

tautomer

noun ˈtɔːtəməˈtɔdəmər

Chemistry

Each of two or more isomers of a compound which exist together in equilibrium, and are readily interchanged by migration of an atom or group within the molecule.
〔化〕互变（异构）体
Example sentencesExamples
- These structures are called tautomers, which exist in dynamic equilibrium with each other.
- In our previous study on vibrational relaxation in HRP the relaxation time varied in the range of 1-10 ps for different vibrational modes of pyrrole tautomers of the chromophore.
- Most often, the ketone is the much more stable of the two tautomers.
- Because the interconversion of the two tautomers is slower than the actual proton transfer reaction, a conformational change is probably associated with the isomerization.
- Earlier studies also support the fact that phenolic compounds could convert to different tautomers, quinone, ketone and dimers at higher pH in the presence of oxidative species.

Derivatives

tautomeric

adjective tɔːtəˈmɛrɪk

Chemistry

Although the double bond in the 7-membered ring of hypocrellin B constrains it to exist in one conformational and tautomeric form, it appears that in the excited state this is not the case.
Example sentencesExamples
- All these techniques pointed to the fact that the unstable form has the 7,14-diketo tautomeric structure, like the stable form, and not the 1,6-diketo structure.
- Point mutations, for example, can be due to tautomeric shift (a movement of hydrogen atoms that changes the properties of bonding).
- This is corroborated by the fact that the interconversion between A 1 and A 3 is very fast at room temperature, which cannot be explained by a simple tautomeric conversion.
- That is, regardless of the tautomeric form in which the molecule finds itself there is always conserved an aromatic core to which is attached a hydroxyl group peri to a carbonyl group.

tautomerism

noun tɔːˈtɒmərɪz(ə)mtɔˈtɑməˌrɪzəm

Chemistry

The P-diketone structure can undergo keto-enol tautomerism in solutions.
Example sentencesExamples
- The HFQ is unsubstituted at nitrogen in position 1, so that tautomerism can take place.
- As explained earlier, curcumin exists in keto-enol tautomerism; these tautomeric equilibria both in the ground and in the excited states can be influenced by the solvent protons.
- This is tautomerism, where two isomers exist in dynamic equilibrium with each other.
- The same is true of tautomerism in aromatic molecules.

Origin

Early 20th century: blend of tauto- 'same' and isomer.

Definition of tautomer in US English:

tautomer

nounˈtôdəmərˈtɔdəmər

Chemistry

Each of two or more isomers of a compound which exist together in equilibrium, and are readily interchanged by migration of an atom or group within the molecule.
〔化〕互变（异构）体
Example sentencesExamples
- These structures are called tautomers, which exist in dynamic equilibrium with each other.
- In our previous study on vibrational relaxation in HRP the relaxation time varied in the range of 1-10 ps for different vibrational modes of pyrrole tautomers of the chromophore.
- Earlier studies also support the fact that phenolic compounds could convert to different tautomers, quinone, ketone and dimers at higher pH in the presence of oxidative species.
- Because the interconversion of the two tautomers is slower than the actual proton transfer reaction, a conformational change is probably associated with the isomerization.
- Most often, the ketone is the much more stable of the two tautomers.

Origin

Early 20th century: blend of tauto- ‘same’ and isomer.

词汇	tautomer
释义	Definition of tautomer in English: tautomer noun ˈtɔːtəməˈtɔdəmər Chemistry Each of two or more isomers of a compound which exist together in equilibrium, and are readily interchanged by migration of an atom or group within the molecule. 〔化〕互变（异构）体 Example sentencesExamples These structures are called tautomers, which exist in dynamic equilibrium with each other. In our previous study on vibrational relaxation in HRP the relaxation time varied in the range of 1-10 ps for different vibrational modes of pyrrole tautomers of the chromophore. Most often, the ketone is the much more stable of the two tautomers. Because the interconversion of the two tautomers is slower than the actual proton transfer reaction, a conformational change is probably associated with the isomerization. Earlier studies also support the fact that phenolic compounds could convert to different tautomers, quinone, ketone and dimers at higher pH in the presence of oxidative species. Derivatives tautomeric adjective tɔːtəˈmɛrɪk Chemistry Although the double bond in the 7-membered ring of hypocrellin B constrains it to exist in one conformational and tautomeric form, it appears that in the excited state this is not the case. Example sentencesExamples All these techniques pointed to the fact that the unstable form has the 7,14-diketo tautomeric structure, like the stable form, and not the 1,6-diketo structure. Point mutations, for example, can be due to tautomeric shift (a movement of hydrogen atoms that changes the properties of bonding). This is corroborated by the fact that the interconversion between A 1 and A 3 is very fast at room temperature, which cannot be explained by a simple tautomeric conversion. That is, regardless of the tautomeric form in which the molecule finds itself there is always conserved an aromatic core to which is attached a hydroxyl group peri to a carbonyl group. tautomerism noun tɔːˈtɒmərɪz(ə)mtɔˈtɑməˌrɪzəm Chemistry The P-diketone structure can undergo keto-enol tautomerism in solutions. Example sentencesExamples The HFQ is unsubstituted at nitrogen in position 1, so that tautomerism can take place. As explained earlier, curcumin exists in keto-enol tautomerism; these tautomeric equilibria both in the ground and in the excited states can be influenced by the solvent protons. This is tautomerism, where two isomers exist in dynamic equilibrium with each other. The same is true of tautomerism in aromatic molecules. Origin Early 20th century: blend of tauto- 'same' and isomer. Definition of tautomer in US English: tautomer nounˈtôdəmərˈtɔdəmər Chemistry Each of two or more isomers of a compound which exist together in equilibrium, and are readily interchanged by migration of an atom or group within the molecule. 〔化〕互变（异构）体 Example sentencesExamples These structures are called tautomers, which exist in dynamic equilibrium with each other. In our previous study on vibrational relaxation in HRP the relaxation time varied in the range of 1-10 ps for different vibrational modes of pyrrole tautomers of the chromophore. Earlier studies also support the fact that phenolic compounds could convert to different tautomers, quinone, ketone and dimers at higher pH in the presence of oxidative species. Because the interconversion of the two tautomers is slower than the actual proton transfer reaction, a conformational change is probably associated with the isomerization. Most often, the ketone is the much more stable of the two tautomers. Origin Early 20th century: blend of tauto- ‘same’ and isomer.
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