Tautomers are organic compounds that are interconvertible by a chemical reaction called tautomerization. This reaction results in the formal migration of a hydrogen atom accompanied by a switch of adjacent conjugated double bonds. In solutions where tautomerization is possible, a chemical equilibrium of the tautomers will be reached. The exact ratio of the tautomers depends on several factors, including temperature, solvent, and pH. The concept of tautomers that are interconvertable by tautomerizations is called tautomerism. Jump to: navigation, search Image File history File links Tautomers. ... An organic compound is any member of a large class of chemical compounds whose molecules contain carbon, with exception of carbides, carbonates, carbon oxides and gases containing carbon. ... Jump to: navigation, search A chemical reaction is a process involving one, two or more substances (called reactants), characterized by a chemical change and yielding one or more product(s) which are different from the reactants. ... Jump to: navigation, search General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... Jump to: navigation, search Properties For alternative meanings see atom (disambiguation). ... In linguistics, grammatical conjugation is the creation of derived forms of a verb from the word root by inflection (regular alteration according to rules of grammar). ... Covalent bonding is a form of chemical bonding characterized by the sharing of one or more pairs of electrons between atoms, in order to produce a mutual attraction, which holds the resultant molecule together. ... Dissolving table salt in water In chemistry, a solution is a homogeneous mixture of one or more substances (the solutes) dissolved in another substance (the solvent). ... Chemical equilibrium is the state in which a chemical reaction proceeds at the same rate as its reverse reaction; the rates of the forward and reverse reactions are equal, and the concentration of the reactants and products stop changing. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... A solvent is a liquid that dissolves a solid, liquid, or gaseous solute, resulting in a solution. ... The title of this article begins with a capital letter, due to technical limitations of the MediaWiki software. ...

Tautomerizations are catalyzed by: In chemistry and biology, catalysis is the acceleration of the reaction rate of a chemical reaction by means of a substance, called a catalyst, that is itself unchanged chemically by the overall reaction. ...

• base (1. deprotonation; 2. formation of a delocalized anion (e.g. an enolate); 3. protonation at a different position of the anion).
• acids (1. protonation; 2. formation of a delocalized cation; 3. deprotonation at a different position adjacent to the cation).

Common tautomeric pairs are: The common (Arrhenius) definition of a base is a chemical compound that either donates hydroxide ions or absorbs hydrogen ions when dissolved in water. ... In chemistry, delocalized electrons are electrons in a molecule that do not belong to a single atom or a covalent bond. ... An anion is an ion with negative charge. ... Enol (or, more officially, but less commonly: alkenol) is an alkene with hydroxyl group on one of the carbon atoms of the double bond. ... Protonation is the addition of a proton (H+) to an atom, molecule, or ion. ... Jump to: navigation, search (often represented by the generic formula AH) is typically a water-soluble, sour-tasting chemical compound. ...

• ketone - enol, e.g. for acetone (see: keto-enol tautomerism).
• amide - imidic acid, e.g. during nitrile hydrolysis reactions.
• lactam - lactim, an amide - imidic acid tautomerism in heterocyclic rings, e.g. in the nucleobases guanine, thymine, and cytosine.
• enamine - imine
• amine - imine and
• enamine - enamine, e.g. during pyridoxalphosphate catalyzed enzymatic reactions.