4-Toluenesulfonyl chloride → 2-(2-(2-Ethoxyethoxy)ethoxy)ethyl 4-methylbenzenesulfonate

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Reaction Steps

In a 3-neck, 2 L rbf, NaOH (135 g, 3.37 mol) was added slowly to water (1 L). After the addition was complete, the solution was cooled to room temperature and DCM (2 L) added, followed by triethylene glycol monoethyl ether (500 g, 2.81 mol). p-Toluenesulfonyl chloride (535 g, 2.81 mol) was added portion-wise over a period of 10 minutes, and the mixture refluxed for 2 hours. After cooling to room temperature, the reaction mixture was poured into water (2 L), mixed well and separated. The organic phase was washed with water (2×2 L), dried over MgSO4, filtered and solvent removed by rotary evaporation. The resulting clear, colourless oil was stirred at room temperature with a 10% aqueous NaOH solution (1 L) to hydrolyze unreacted p-toluenesulfonyl chloride. After 18 hours, the material was poured into water (1 L), extracted with chloroform (500 mL) and separated. The organic portion was washed with water (2 L), 10% HCl (2 L) and water (2 L). The material was dried over anhydrous MgSO4, filtered and solvent removed by rotavap to afford (103) as a clear, colourless oil (595 g, 64%).

Provenance & Evidence