# Can someone explain how do the mechanism for this reaction? [closed]

Do you protonate the oxygen first?

## closed as off-topic by airhuff, Mithoron, Todd Minehardt, bon, ronFeb 18 '18 at 15:20

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• The dihydrofuran is an enol ether. You should try protonating it as if it were an enolate/enol to make a oxocarbenium ion first. – Zhe Feb 18 '18 at 3:04

In first step the hydrogen attached to $C_2$ as the carbocation on $C_1$ is more stable.