1: 98 percent / NaN3 / acetonitrile / 4 h / Ambient temperature 2: NaBH4 / acetonitrile / 0.08 h / -20 °C 3: toluene / 0.5 h / Heating 4: toluene / 0.5 h / Heating 5: 70 percent / concd. HCl / methanol / 6 h / Heating View Scheme

1: 98 percent / NaN3 / acetonitrile / 4 h / Ambient temperature 2: toluene / 1.5 h / Heating 3: KOH / toluene; H2O / 0.25 h / 0 °C 4: 1 N HCl / H2O 5: 90 percent / 1 N NaOH / methanol / 1.5 h / Ambient temperature View Scheme