Pyridine → 2,2-Dimethylpropanoic acid, 4-hydroxy-2,3,6-trimethylphenyl ester

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Reaction Steps

A 500 mL round bottom flask is equipped with a stirring bar and charged with 15.2 g (100 mmol) of trimethylhydroquinone and 23.7 g (3×100 mmol) of pyridine in 100 mL dichloromethane. The solution is stirred at ambient temperature and a solution of 20.8 g (100 mmol) of pivaloyl chloride in 100 mL of dichloromethane is added over 15 minutes. The final solution is stirred at ambient temperature for 48 hours, then washed with 1×100 mL of 3N hydrochloric acid solution, 1×50 mL of 3N hydrochloric acid solution, water, dried (magnesium sulfate) and evaporated leaving 26.6 g (>100%) of a pale yellow solid, mp 88°-112° C. (after drying 24.1 g). Recrystallization from hexane in the presence of charcoal affords the title compound as colorless cubes; mp 119°-121° C.

Provenance & Evidence