反应详情

A colorless, homogeneous solution of 2,5-dimethylbenzoic acid (6.3264 g, 42.1 mmol) and 4 N HCl/1,4-dioxane (11.58 mL, 46.3 mmol) was refluxed under nitrogen. After 2.5 hr, the reaction was cooled to room temperature and concentrated in vacuo. The residue was dissolved in EtOAc (100 mL) and washed with water (40 mL), 1N aq. NaOH (40 mL), water (40 mL) and brine (40 mL), successively. The organic solution was dried over MgSO4 and concentrated in vacuo to give the desired product (5.934 g, 34.7 mmol, 82% yield) as a colorless oil.

1. concentrationconcentrated in vacuo
2. dissolutionThe residue was dissolved in EtOAc (100 mL)
3. washwashed with water (40 mL), 1N aq. NaOH (40 mL), water (40 mL) and brine (40 mL)
4. dry with materialThe organic solution was dried over MgSO4
5. concentrationconcentrated in vacuo