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tautomerism |
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tautomerismExistence of two or more chemical compounds that have the same chemical composition but different structures (isomers) and that convert easily from one to another. A major class of tautomeric reactions involves exchange of a hydrogen atom between two other atoms in the same molecule, in both cases forming a covalent bond. For example, in keto-enol tautomerism, the hydrogen atom bonded to the carbon atom in a carbonyl (keto) group (−CH−C=O; see functional group) moves to the oxygen atom, making it an enol group (−C=C−OH). The keto form predominates in many aldehydes and ketones, the enol form in phenols. Sugars (e.g., glucose) exhibit tautomerism between open (chain) forms and closed (ring) forms. See also isomerism. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Donohue, however, "happily let out that for years organic chemists had been arbitrarily favoring particular tautomeric forms over their alternatives on only the flimsiest of grounds. Several examples of the new Optive products include Benchware(TM), a suite of desktop tools for combinatorial library enumeration, design and analysis; EA-Inventor, a novel program for de novo molecular design; and innovative technology for uniquely and accurately representing the tautomeric and stereochemical structures of chemical compounds as they can exist under various natural conditions. |
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