Chlorosulfonic acid → 7-Bromo-dibenzofuran-2-sulfonyl Chloride

Participants

Reaction Conditions

Reaction Steps

Chlorosulfonic acid (3.75 mL, 56 mmoles) was added dropwise to a solution of 3-bromo-dibenzofuran (9.21 g, 37.3 mmoles) in 150 mL of chloroform at room temperature. The reaction was stirred for 5 hours, cooled to 0° C., filtered, and washed the solid with cold dichloromethane. This solid (6.12 g, 18.7 mmoles) was mixed with phosphorous pentachloride (12.9 g, 61.7 mmoles) and the mixture was heated to 110° C. for 4 hours. The mixture was cooled to room temperature and quenched with ice water. Filtered the resulting suspension to give the title compound as a white solid.

Provenance & Evidence