[Na].[S:2]([C:6]1[CH:13]=[CH:12][CH:11]=[CH:10][C:7]=1[CH:8]=[O:9])(O)(=[O:4])=[O:3].S(Cl)([Cl:16])=O>CN(C)C=O.C(OCC)C.O>[CH:8]([C:7]1[CH:10]=[CH:11][CH:12]=[CH:13][C:6]=1[S:2]([Cl:16])(=[O:4])=[O:3])=[O:9]To a solution of 2-sulfobenzaldehyde sodium salt (2.0 g, 9.6 mmol) in 0.8 mL of dry N,N-dimethylformamide was added thionyl chloride (7.0 mL, 96 mmol) under nitrogen at 0° C. After being stirred at 100° C. for 3 min, the reaction mixture was diluted with diethyl ether and water at 0° C., successively. The separated organic layer was washed with water, brine, and dried over MgSO4. After filtration, the filtrate was concentrated in vacuo to obtain crude 2-formylbenzenesulfonyl chloride (0.75 g).
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