1.1: p-toluenesulfonic acid monohydrate / benzene / |Reflux 2.1: 9-bora-bicyclo[3.3.1]nonane / tetrahydrofuran / 20 °C 2.2: |Reflux 3.1: hydrogenchloride / tetrahydrofuran; water / 20 °C 4.1: hydrogen; palladium 10 on activated carbon / ethanol / 3 h / 20 °C 5.1: Fremy’s salt / chloroform; aq. phosphate buffer / 20 °C / pH 6 View Scheme