Chlorosulfonic acid → Bicyclo[4.2.0]octa-1,3,5-triene-3-sulfonyl chloride, 8-oxo-

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Reaction Steps

Benzocyclobutenone (2.36 g, 0.02mol) was added slowly to a strongly stirred chlorosulfuric acid (3 mL) in chloroform (10 mL) solution. After the addition was done, the reaction mixture was stirred for 5 hours. Then the chloroform was evaporated, and the residue was precipitated in water yielding fine pink crystals. m.p. 80° C.; IR (KBr, cm−1): 1762; UV (λmax, methanol) 272 nm.

Provenance & Evidence