1: 92 percent / NaOH / ethanol; H2O / 1.25 h / Heating 2: 83 percent / ZnI2 / CHCl3 / 22 h / Heating 3: 1.) SnCl2, HOAc, 2.) conc. HCl / 1.) 10 min, 2a.) RT, 18 h, 2b.) 100 deg C, 2.5 h View Scheme

sodium hydroxide in ethanol; water 1.25 h; Heating;