Ethyl 2-chloropropionate → Ethyl 2-(methylsulfonyl)propanoate

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Sodium methyl sulfinate (103 g, 937 mmol) was combined with the ethyl 2-chloropropionate (109 g, 892 mmol) in ethanol (350 mL) in a 500 mL one neck round bottom flask. The reaction was heated to 77° C. for 20 h, and then allowed to cool to room temperature. Solids were removed by filtration through celite, and the filter pad was washed with ethanol. The combined filtrates were concentrated under reduced pressure. The crude product was suspended in diethyl ether (250 mL), and solids were removed by filtration. The filtrate was concentrated under reduced pressure to afford the title compound as a pale yellow oil (51 g, 73%). 1H NMR (400 MHz, CHLOROFORM-d) δ1.32 (t, J=7.05 Hz, 3H) 1.67 (d, J=7.47 Hz, 3H) 3.05 (s, 3H) 3.83-3.92 (m, 1H) 4.18-4.37 (m, 2H).

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