Short-RInChIKey=SA-FUHFF-UHFFFADPSC-AJKDFBCTGM-UHFFFADPSC-NUHFF-NUHFF-NUHFF-ZZZ

In a vial, 4-ethoxybenzaldehyde (200 mg, 1.33 mmol, 1.20 equiv) was dissolved in toluene (5.00 mL) and 2-amino-4-chlorobenzenethiol (177 mg, 1.11 mmol, 1.00 equiv) and p-toluenesulfonic acid monohydrate (21.1 mg, 111 μmol, 0.100 equiv) were added. The reaction was stirred for 18 h at 70 °C. The reaction mixture was poured into a flask and the reaction vessel was flushed with toluene to collect the material that remained in the reaction vessel.