Preparation method of 4-isopropenylphenol

The invention discloses a preparation method of 4-isopropenylphenol, which comprises the following steps: firstly, carrying out reaction on p-hydroxyacetophenone and 3, 4-dihydropyran to generate 1-(4-tetrahydropyran-2-oxyphenyl) ethanone; the preparation method comprises the following steps: firstly, reacting methyltriphenylphosphonium bromide with potassium tert-butoxide to prepare a phosphorus ylide reagent, and then reacting 1-(4-tetrahydropyran-2-oxyphenyl) ethanone with the phosphorus ylide reagent to generate 2-(4-(1-propylene-2-yl) phenoxyl) tetrahydro-2H-pyran; finally, the 2-(4-(1-propylene-2-yl) phenoxy) tetrahydro-2H-pyran is subjected to deprotection, and the 4-isopropenyl phenol is obtained. According to the preparation method disclosed by the invention, each step of reaction is relatively clean, no obvious side reaction exists, the process pollution is small, each step of reaction condition is mild, the operation is simple and safe, the post-treatment flow is simple, the raw materials are simpl