Sulfuric Acid → p-Tolylthiourea

Participants

Reaction Conditions

Reaction Steps

10.7 g of 4-toluidine was added dropwise to 27% aqueous sulfuric acid solution which contains 5.4 g of sulfuric acid. After the reaction mixture was heated to 75° C., 8.4 g of ammonium thiocyanate in a solid state was slowly added thereto. Upon complete addition, the reaction mixture was stirred for 20 hours at 80° C. to 90° C. After adding toluene, the whole mixture was refluxed for one hour, cooled to room temperature and then adjusted to pH 7.5 to 8 by slowly adding ammonia water. The resulting white solid was filtered, washed once with each of water and toluene and then dried under reduced pressure to obtain the title compound as a white solid (Yield: 78.5%).

Provenance & Evidence