Sodium Hydroxide → Sodium 2-(2-Propoxyethoxy)-5-nitrobenzenesulfonate

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A mixture of 26.0 g of sodium 2-chloro-5-nitrobenzenesulfonate and 5.0 g of sodium silicate (Na2O.nSiO2 ; n=about 3) was suspended in 120 ml of 2-propoxyethanol and while stirring the suspension, a solution prepared by dissolving 5.0 g of sodium hydroxide in 5 ml of water was dropwise added thereto at 65° C. over a period of 10 minutes. After the dropwise addition was completed, the resulting mixture was stirred at 65° C. for 3 hours and insoluble products were then removed by suction filtration. On allowing the filtrate to stand, solids precipitated. The solids were removed by filtration and the filtrate was condensed and dried. The addition of 100 ml of ethanol to the residue resulted in the formation of crystals. The crystals were collected by filtration, washed with isopropyl alcohol and dried at 50° C. Yield: 14.1 g.

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