1: 69.7 percent / aluminum chloride / CS2 / 2 h / -15 - -10 °C 2: 56 percent / K2Cr2O7 / acetic acid / 16 h / 100 - 105 °C 3: 86 percent / 24percent NaOH; conc.HCl / H2O; methanol / 1.5 h / Heating 4: 56.9 percent / Raney nickel, 5percent NaOH / ethanol / 1 h / Heating View Scheme

1: 69.7 percent / aluminum chloride / CS2 / 2 h / -15 - -10 °C 2: 56 percent / K2Cr2O7 / acetic acid / 16 h / 100 - 105 °C 3: 86 percent / 24percent NaOH; conc.HCl / H2O; methanol / 1.5 h / Heating 4: 29 percent / Raney nickel, 5percent NaOH / ethanol / 1 h / Heating View Scheme

aluminium trichloride in carbon disulfide 2 h; Ambient temperature;

aluminium trichloride in carbon disulfide 2 h; Ambient temperature;

1: 69.7 percent / aluminum chloride / CS2 / 2 h / -15 - -10 °C 2: 85 percent / 24percent NaOH; conc.HCl / methanol; H2O / 1.5 h / Heating 3: 93 percent / Raney nickel, 5percent NaOH / ethanol; H2O / 4 h / 70 - 80 °C View Scheme