[CH3:1][S:2]([CH2:5][C:6](=[CH2:11])[C:7]([O:9]C)=[O:8])(=[O:4])=[O:3].[OH-].[Li+].S([O-])(O)(=O)=O.[K+]>O1CCCC1.O>[CH3:1][S:2]([CH2:5][C:6](=[CH2:11])[C:7]([OH:9])=[O:8])(=[O:4])=[O:3]A solution of methyl 2-(methylsulfonylmethyl)acrylate (970 mg, 5.44 mmol) in 15 mL of tetrahydrofuran was treated with a solution of lithium hydroxide (270 mg, 6.4 mmol) in 7 mL of water. The solution was stirred at room temperature for 5 minutes and then acidified to pH=1 with 1 N aqueous potassium hydrogen sulfate and the solution extracted three times with ethyl acetate. The combined ethyl acetate solution was dried over anhydrous magnesium sulfate, filtered, and concentrated to give 793 mg, 89% of 2-(methylsulfonylmethyl)acrylic acid, mp 147-149° C.; formula:
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