Sulfuric Acid → 4-Cyanobenzoic acid

Participants

Reaction Conditions

Reaction Steps

A mixture containing p-cyanobenzylamine (13.2 g), dioxane (70 g), sodium carbonate (5.3 g), water (50 g), and ferric nitrate (0.1 g) was stirred, and a 14 wt. % aqueous solution (200 g) of sodium hypochlorite was added dropwise thereto over three hours while inside temperature of a reactor was maintained at 50° C. or lower. The reaction mixture was further stirred for two hours. Subsequently, water (100 g) and urea (4 g) were added to the mixture, and the resultant mixture was further stirred for 20 minutes. The pH of the mixture was adjusted to four through addition of 98 wt. % sulfuric acid. Precipitated crystals were collected through filtration, washed with water, and dried, to thereby obtain 11.9 g of p-cyanobenzoic acid (yield 90%, based on p-cyanobenzylamine). The p-cyanobenzoic acid obtained had a purity of 96%.

Provenance & Evidence