p-Toluenesulfonic acid → 2,3,4,5-Tetramethylfuran

Participants

Reaction Steps

A solution of 3,4-dimethylhexane-2,5-dione (3.00 g, 21.1 mmol) and p-toluenesulfonic acid (401 mg, 2.11 mmol) in benzene (30 mL) was heated to reflux in a Dean-Stark trap overnight. The reaction mixture was distilled at atmospheric pressure to remove the excess benzene. The remaining mixture was transferred to a smaller flask and distilled at atmospheric pressure. The fraction that came over between 80-100° C. was collected to give 509 mg (19%) of compound 219A as a light yellow oil.

Provenance & Evidence