Hydrochloric Acid → 1-Naphthalenesulfinic acid

Participants

Reaction Steps

110 g of 1-naphthalenesulfonyl chloride was added to 500 ml of an aqueous solution of 122 g of sodium sulfite. A 20% aqueous solution of 36 g of sodium hydroxide was added dropwise to the reaction mixture while being cooled with water to 30° C. until the pH value reached around 8. The reaction mixture became homogenous in about 1 hour. 135 ml of 35% hydrochloric acid was then added dropwise to the reaction mixture. The resulting grayish white crystal was then filtered off, and air dried. The yield was 91.4 g (98% of theoretical value).

Provenance & Evidence