Sulfuric Acid → 2-Acetoxy-2,3-dihydro-3,3-dimethylbenzofuran-5-yl methanesulphonate

Participants

Reaction Steps

2-ethoxy-2,3-dihydro-3,3-dimethylbenzofuran-5-yl methanesulphonate (7 parts) was treated with a mixture of acetic anhydride (20 parts) and sulphuric acid (0.6 parts) and left at 50° C. for two hours. The solution was then poured into an excess of ice and sodium bicarbonate. An oil precipitated which solidified and was filtered off and recrystallised from 90, aqueous ethanol to give 2-acetoxy-2,3-dihydro-3,3-dimethylbenzofuran-5-yl methanesulphonate (6.6 parts) melting point 83°-85° C.

Provenance & Evidence