| Keto and enol isomers exist in equilibrium in which both tautomers are present but, in simple cases, the keto form is much more stable than the enol form. |
| These structures are called tautomers, which exist in dynamic equilibrium with each other. |
| The nucleosides are better models for the bases in DNA and RNA because the sugar moiety eliminates tautomers that cannot occur in the polymers. |
| He also investigated keto and enol tautomers and morphine alkaloids. |
| 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. |
