IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry

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Ring-Chain Tautomerism : Tautomeric forms exist in substances possessing functional groups which can interact additively and which are so placed that intramolecular reaction leads to a stable cyclic system. The cyclic form usually predominates (especially if it contains five or six members).

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. The enol and keto forms are said to be tautomers of each other. The interconversion of the two forms involves the movement of a proton and the shifting of bonding electrons; hence, the isomerism qualifies as tautomerism.

For more information refer :

http://www.answers.com/topic/tautomerism

http://en.wikipedia.org/wiki/Tautomer

http://en.wikipedia.org/wiki/Keto-enol_tautomerism

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