1: KOH / H2O / 3 h / Heating 2: 25 percent / dicyclohexylurea / tetrahydrofuran / 10 h / Heating 3: 30 percent / Zn(Hg); HCl; glacial AcOH / Heating View Scheme

hydrogenchloride; acetic acid; mercury; zinc Clemmensen reduction; Heating;