Noun
an organic compound that contains a hydroxyl group bonded to a carbon atom which in turn is doubly bonded to another carbon atom
Source: WordNetAn additional two structural isomers are the enol tautomers of the carbonyl isomers, but these are not stable. Source: Internet
The addition of water to alkynes is a related reaction except the initial enol intermediate converts to the ketone or aldehyde. Source: Internet
This creates what is called an enol derivative that will be reduced to a “lactyl moiety” by NADPH in step six. Source: Internet
Usually, the keto form is more stable than the enol. Source: Internet