Sodium Hydroxide → Disodium

Participants

Reaction Steps

Combine p-nitrotoluene-m-sulfonic acid (5 g, 27 mmol) and diethylene glycol (30 mL) and warm to 40°-45° C. Add slowly to this with stirring, a mixture of sodium hypochlorite (5% available chlorine, 50 mL) and a solution of sodium hydroxide (6 g in 8 mL water). After addition, maintain the temperature at 50°-55° C. and stir for 35 minutes. Cool the reaction and filter to yield 4,4'-dinitrostilbene-3,3'-disulfonic acid, disodium salt. Convert this to the diacid by treatment with 1M hydrochloric acid, filter and concentrate under vacuum to yield 4,4'-dinitrostilbene-3,3'-disulfonic acid.

Provenance & Evidence