Hydrochloric Acid → 1-Naphthalenesulfinic acid

Participants

Reaction Steps

To 500 ml of an aqueous solution of 122 g of sodium sulfite was added 110 g of α-naphthalenesulfonyl chloride. While cooling the mixture with water, 20% aqueous solution of 36 g of sodium hydroxide was dropwise added to the mixture so as to keep the reaction mixture at a pH of about 8. After about one hour, the reaction mixture became uniform. To the mixture was added 135 ml of 35% hydrochloric acid was dropwise added. The formed grayish-white crystals were recovered by filtration and air-dried. The yield was 91.4 g (98% of theoretical value).

Provenance & Evidence