1: 100 percent / methanol / 25 °C 2: 87 percent / DBN / benzene / Heating 3: 65 percent / KOH / methanol; H2O / 20 °C 4: 100 percent / KI, I2, NaHCO3 / H2O / 20 °C 5: 26 percent / DBU / benzene / 60 °C View Scheme

1: 100 percent / methanol / 25 °C 2: 87 percent / DBN / benzene / Heating 3: 65 percent / KOH / methanol; H2O / 20 °C 4: 100 percent / KI, I2, NaHCO3 / H2O / 20 °C 5: 18 percent / n-Bu3SnH / benzene / 55 °C View Scheme

1: 100 percent / methanol / 25 °C 2: 87 percent / DBN / benzene / Heating View Scheme