Acetic Anhydride → 3,5-Dimethyl-4-acetoxybenzoic acid

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Reaction Steps

The compound 3,5-dimethyl-4-hydroxybenzoic acid (5.04 g, 30.33 mmol) was mixed with pyridine (20 mL). Acetic anhydride (3.72 g, 36.4 mmol) was added and the mixture was stirred at room temperature for 4 h. The solvent was evaporated in vacuo to obtain 4-acetoxy-3,5-dimethyl-benzoic acid in quantitative yield (6.33 g). The compound 4-acetoxy-3,5-dimethyl-benzoic acid (0.36 g, 1.73 mmol)) was dissolved in dichloromethane (5 mL) and oxalyl chloride (0.3 mL, 3.46 mmol) was added dropwise, followed by 1 drop of DMF. The reaction mixture was stirred at room temperature under nitrogen for 2 h. The solvent was evaporated in vacuo to obtain acetic acid 4-chlorocarbonyl-2,6-dimethyl-phenyl ester in quantitative yield (0.392 g).

Provenance & Evidence