1: 5.5 g / 1,5-diazabicyclo<4.3.0>non-5-ene / benzene / 2 h 2: aq. NaOH / methanol / 2 h / Heating View Scheme

1: 58 percent / iron pentacarbonyl, potassium hydroxide / ethanol / 20 h / Heating 2: 5.5 g / 1,5-diazabicyclo<4.3.0>non-5-ene / benzene / 2 h 3: aq. NaOH / methanol / 2 h / Heating View Scheme

sodium hydroxide in methanol 2 h; Heating;