1: ZnCl2 / heptane / 2 h / Heating 2: 1.) 20percent aq. KOH, sodium hydrosulfite, 2.) conc. H2SO4 / 1.) reflux, 2.5 h, 2.) 80 deg C, 4 h View Scheme

potassium hydroxide; sodium disulfite; sulfuric acid 1.) reflux, 2.5 h, 2.) 80 deg C, 4 h; Yield given. Multistep reaction. Yields of byproduct given;