Br[CH2:2][CH2:3][C:4]1[C:13]2[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=2)[C:7]([S:14]([OH:17])(=[O:16])=[O:15])=[CH:6][CH:5]=1.[OH-].[Na+:19]>>[CH:3]([C:4]1[C:13]2[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=2)[C:7]([S:14]([O-:17])(=[O:15])=[O:16])=[CH:6][CH:5]=1)=[CH2:2].[Na+:19]Next, 4-(2-bromoethyl)naphthalenesulfonic acid (10 g) was slowly added dropwise to a 1-mol/L aqueous solution of sodium hydroxide (100 mL), and the whole was stirred for 1 hour at room temperature. After that, the resultant was refluxed for 6 hours, and was then subjected to a dehydrobromination reaction, whereby sodium 4-ethenylnaphthalenesulfonate was obtained.
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