N[C:2]1[C:3]([S:8]([OH:11])(=[O:10])=[O:9])=[CH:4][CH:5]=[CH:6][CH:7]=1.Cl.N([O-])=O.[Na+].[C:17]([O-])(=O)[CH3:18].[Na+]>[OH-].[Na+].[Pd].CO>[CH2:17]=[CH:18][C:2]1[C:3]([S:8]([OH:11])(=[O:10])=[O:9])=[CH:4][CH:5]=[CH:6][CH:7]=110.1 g of aniline-2-sulphonic acid (85%) were dissolved in 40 ml of sodium hydroxide solution (6%) and treated with 40 ml of conc. HCl. 12 ml of aqueous NaNO2 solution were added dropwise to the resulting suspension at a temperature of 0° to 5° C. and the mixture was stirred at this temperature for 30 minutes. 50 g of sodium acetate, 300 ml of methanol and 0.5 g of bis(dibenzylideneacetone-2,2'-disulphonic acid disodium salt)palladium(0) were added successively and the mixture was stirred for 3 hours at 20° C. under an ethylene pressure of 20 bar. It was then filtered and evaporated to dryness, and the residue was stirred with ethanol. The mixture was again filtered and evaporated. 7.4 g (72%) of styrene-2-sulphonic acid, Na salt, were obtained.
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