What is tautomerism?

Some articles on tautomerism:

Valence Tautomerism
... Valence tautomerism is a type of tautomerism in which single and/or double bonds are rapidly formed and ruptured, without migration of atoms or groups ... It is distinct from prototropic tautomerism, and involves processes with rapid reorganisation of bonding electrons ... An example of this type of tautomerism can be found in bullvalene ...
Dimedone - Tautomerism
... Crystalline dimedone contains chains of molecules, in the enol form, linked by hydrogen bonds. ...
Keto-enol Tautomerism
... In organic chemistry, keto-enol tautomerism refers to a chemical equilibrium between a keto form (a ketone or an aldehyde) and an enol (an alcohol) ... of bonding electrons hence, the isomerism qualifies as tautomerism ...
Heinz Falk - Published Works - Scientific Articles
... Wagner, Tautomerism and Stereochemistry of Hypericin Force Field, NMR, and X-ray Crystallographic Investigations ... Falk, Tautomerism and Stereochemistry of Isohypericin, Bromo-hypericines, and Gymnochromes Force Field Investigations ... Falk, Stereochemistry and Tautomerism of Stentorin, Isostentorin, and Fringelit D Force Field Investigations ...
Phenol - Properties - Acidity - Tautomerism
... Phenol exhibits keto-enol tautomerism with its unstable keto tautomer cyclohexadienone, but only a tiny fraction of phenol exists as the keto form ...