1: 92 percent / conc. H2SO4 / ethanol; H2O / 0.33 h / Heating 2: 90 percent / 500 °C / 10 Torr 3: 71 percent / NEt3 / 3-benzyl-5-(2-hydroxyethyl)-4-methyl-1,3-thiazolium chloride / 15 h / 65 °C View Scheme

1: 92 percent / conc. H2SO4 / ethanol; H2O / 0.33 h / Heating 2: 90 percent / 500 °C / 10 Torr 3: 76 percent / NEt3 / 3-benzyl-5-(2-hydroxyethyl)-4-methyl-1,3-thiazolium chloride / 15 h / 65 °C View Scheme

1: 92 percent / conc. H2SO4 / ethanol; H2O / 0.33 h / Heating 2: 90 percent / 500 °C / 10 Torr View Scheme