1.1: sodium hydride / N,N-dimethyl-formamide; mineral oil / 16 h / 20 °C 1.2: 2 h / 20 °C 2.1: hydrogen; 5 palladium on charcoal / methanol / 16 h / 7500.75 Torr 3.1: sodium nitrite; acetic acid / 0.5 h / 20 °C 4.1: phosphoric acid / methanol; water / 24 h / 20 °C View Scheme