Chlorosulfonic acid → 3,4-Dihydroxy-9,10-dioxo-9,10-dihydroanthracene-2-sulfonyl chloride

Participants

Reaction Conditions

Reaction Steps

3,4-dihydroxy-9,10-dioxo-2-anthracenesulfonic acid sodium salt (1.4 g, 3.9 mmoles) was combined with 30 mL of chlorosulfonic acid and heated to 90° C. for 5 hours, after which the solution was cooled to 0° C. and poured into 100 g of ice. After the ice melted the solution was extracted with CH2Cl2 (3×100 mL), methylene chloride extracts were combined, dried with Na2SO4 and evaporated to produce 0.87 g of solid (Yield 66%).

Provenance & Evidence