Preparation method of 3-methyl-4-isopropyl-phenol

The invention discloses a preparation method of 3-methyl-4-isopropyl-phenol, and belongs to the technical field of organic synthesis. The method includes the steps: (1) performing reaction of m-cresoland alkali under the condition of 5-20 DEG C in water to obtain an intermediate A; (2) performing reaction of the intermediate A and triphosgene in an organic solvent A at the temperature of 20-50 DEG C under alkaline conditions, cooling products after reaction, and separating organic phases to obtain an intermediate B; (3) performing reaction of the intermediate B, a catalyst B and isopropylation reagents in an organic solvent B under the condition of 5-15 DEG C, adding water after reaction, and separating organic phases to obtain an intermediate C; (4) hydrolyzing the intermediate C under the alkaline conditions at the temperature of 50-90 DEG C to obtain products. A synthetic process route is simple, raw materials are easily obtained, reaction time is short, post-treatment is convenient, purity is 97% or more,