1.1: sodium nitrite; hydrogenchloride / water / 0.5 h / -10 °C 1.2: 7 h / 4 °C 2.1: sulfuric acid / ethanol / 3 h / 20 °C 3.1: 3 h / 110 °C 4.1: lithium hydroxide hydrate; water / tetrahydrofuran / 18 h / 20 °C View Scheme
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