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tautomer |
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tautomer (tô`təmər), one of two or more structural isomers isomer (ī`səmər), in chemistry, one of two or more compounds having the same molecular formula but different structures ..... Click the link for more information. that exist in equilibrium and are readily converted from one isomeric form to another. Of the various types of tautomerism that are possible, two are commonly observed. In keto-enol tautomerism a simultaneous shift of electrons and a hydrogen atom occurs; it was first observed by K. Meyer in the ethyl ester of 3-oxobutanoic acid (ethyl acetoacetate), which occurs naturally as a mixture of the two forms. Ring-chain tautomerism, first recognized by Emil Fischer, is exhibited by glucose. It arises as a result of the aldehyde group (-CHO) in a sugar chain molecule reacting with one of the hydroxy groups (-OH) in the same molecule to give it a cyclic (ring-shaped) form. 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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New tools in this application release include a capability for searching chemical structures by a range of parameters, including exact match, isomer, tautomer, parent, R-group and flexmatch. In addition, great scientific progress has been captured in the Chemistry Collection of the new release, including LogD and pKa calculators, tautomer manipulation, and additional reaction enumeration capabilities. With the chemistry data cartridge, MDL is including its unique flexible structure matching which provides highly configurable control over chemical structure searches with flexible switches that include tautomer, stereoisomer, salt forms, fragment counts, and others--all within a single database search. |
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