Potassium Hydroxide → 1,1-Dimethylethyl 4-ethenylphenyl carbonate

Participants

Reaction Conditions

Reaction Steps

A solution comprising 2.4 g of potassium hydroxide, 201 g 4-acetoxystyrene and 500 g of methanol was heated at reflux for 2.2 hours. The reaction was cooled to 12° C. and 64 g potassium hydroxide pellets were added over a period of 10 minutes. After warming to 25° C., 314 g di-tertiary-butyl-dicarbonate was introduced over a period of one hour. After an additional 2.3 hours of reaction time, the reaction slurry was washed with water and extracted with ethyl acetate. The ethyl acetate was stripped from the extraction mixture using a rotary evaporator, and the residual oil was charged with 0.26 g phenothiazine inhibitor. Distillation at 0.1 mm Hg yielded 227.2 g (85% yield) 4-tertiary-butoxycarbonyloxystyrene (IV).

Provenance & Evidence