P-Toluic Acid → 2-(4-Methylphenyl)-1,3-benzothiazole

Participants

Reaction Conditions

Reaction Steps

125 g (1 mol) of o-aminothiophenol, 136 g (1 mol) of p-toluic acid and 600 g of polyphosphoric acid were admixed and stirred into nitrogen gas at 170°-200° C. for 4 hours. After the reaction mixture was cooled to 100° C., it was poured in 5 l of water. The mixture was adjusted to pH 5 with NaOH and the resulting crystals were filtered off, whereupon 220 g of 4-(benzothiazol-2-yl) toluene was obtained as crude crystals. Recrystallization from n-hexane gave 172 g of pure product as colorless prisms melting at 84°-85° C.

Provenance & Evidence