Interestingly, the product actually isolate from alkyne hydration is not the vinylic alcohol, or enol (ene + ol), but is instead a ketone. Although the enol is an intermediate in the reaction, it immediately rearranges to a ketone by a process called keto-enal tautomerism. The individual keto and enol forms are said to be tautomers, a word used to describe constitutional isomers that interconvert rapidly. with few exception, the keto-enol tautomeric equilibrium lies on the side of the krtone; enols are almost never isolated. We'll look more closely at this equilibrium