Methanesulfonyl chloride → Methyl 2-(4-chlorophenyl)acrylate

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Methyl 2-(4-chlorophenyl)-3-hydroxypropanoate (39.4 g, 184 mmol) was dissolved in DCM (500 mL) and treated with TEA (64.0 mL, 459 mmol). The solution was cooled to 0° C. The solution was then slowly treated with MsCl (15.6 mL, 202 mmol) and allowed to stir for 30 minutes. The solution was partitioned with 1N HCl solution, and the aqueous layer was extracted once into DCM. The combined organic layers were washed once more with 1N HCl solution, separated, washed with diluted NaHCO3 solution, and separated. The organic layer was dried over MgSO4, filtered, and concentrated in vacuo to afford an oil which was loaded onto a large fritted filter with a plug of silica gel and eluted with 9:1 hexane:ethyl acetate to give methyl 2-(4-chlorophenyl)acrylate as an oil (30.8 g, 85%).

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