Sodium Hydroxide → 4-Hydroxyphenylsulfonic acid disodium salt

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Reaction Steps

A solution of 4-hydroxybenzenesulfonic acid sodium salt dihydrate (20 g, 86 mmol) in 1N aqueous sodium hydroxide (86 mL, 86 mmol) is stirred and heated at 50–60° C. for 1 hour. The solution is concentrated in vacuo at 50° C. to give a solid. The solid is suspended in anhydrous toluene and concentrated in vacuo. This process is repeated twice. The solid is dried at 50° C. at high vacuum for 18 hours to give 21.34 g of 4-hydroxybenzenesulfonic acid disodium salt.

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