1: 58.6 percent / conc. H2SO4, NaOH, potassium iodide, potassium iodate / ethanol; H2O / 1 h, reflux; overnight at room temp. 2: 25.5 percent / conc. sulfuric acid / 72 h / Ambient temperature View Scheme

sulfuric acid 72 h; Ambient temperature;

KIO3; potassium hydroxide; sulfuric acid; potassium iodide 1.) water, room temperature, 1 h, 2.) EtOH, 60 deg C, 1 h, then room temperature, 12 h, and reflux, 1h; Yield given. Multistep reaction;