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How do you explain keto-enol tautomerism?

Answer 1

This is a bond-forming reaction that occurs extensively in 1,3-dicarbonyl species.......

#RC(=O)CH_2(O=C)R rightleftharpoonsRC(=O)CH=(COH)R #

The resultant enol gives an (energetically stable) 6-membered ring that is stabilized by hydrogen bonding. This delocalization of electrons allows removal of the proton by a strong base to give the enolate, whose alternative carbanion structure facilitates one of the few #C-C# bond formation reactions.

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Answer 2

Skylar Alexander

Keto-enol tautomerism is a type of structural isomerism where a keto tautomer (containing a carbonyl group) can rapidly convert to an enol tautomer (containing an alcohol group) and vice versa. This equilibrium is driven by the movement of hydrogen atoms and the rearrangement of double bonds within the molecule. The process involves proton transfer and formation of new pi bonds, resulting in different resonance structures. The keto form is typically more stable due to the stronger carbon-oxygen bond, but the enol form can be stabilized by hydrogen bonding or other factors.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.