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In basic conditions, propanol can undergo self-condensation to form dipropyl ether. The reaction is catalyzed by the presence of a strong base, like sodium hydroxide (NaOH). The mechanism involves the deprotonation of propanol to form a propanoxide anion, which then attacks another propanol molecule. The reaction is reversible, and the equilibrium lies to the left, but the presence of water can shift the equilibrium to the right, favoring ether formation.