Benzoyl chloride → 5-Amidino-2-benzoyloxybenzenesulfonic acid

Participants

Reaction Steps

To 30 ml of dried pyridine, was added 3.0 g of 5-amidino-2-hydroxybenzenesulfonic acid. To the mixture, while being cooled in ice, was slowly added dropwise 2.0 g of benzoyl chloride. After the addition, the mixture was stirred overnight at room temperature. The insolubles deposited from the reaction mixture were separated by filtration, washed with pyridine, then with water, finally with acetone, and suspended in methanol. The insolubles were removed by filtration, and ethyl ether was added to the filtrate to precipitate a colorless solid. The solid was collected by filtration and recrystallized from a methanol-ethyl ether mixture to obtain 5-amidino-2-benzoyloxybenzenesulfonic acid in colorless solid form.

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