Aerobic oxidation of amines to imines catalyzed by a ruthenium complex under solvent-free conditions

• [Et3NH]2[Ru(dipic)Cl3] showed high efficiency in aerobic oxidation of amines to imines.
• The imines can be obtained in high yield under air and solvent-free conditions.
• This protocol is an atom-economical green process and tolerates various substrates.
• [Et3NH]2[Ru(dipic)Cl3] is readily available.

A ruthenium complex [Et3NH]2[Ru(dipic)Cl3] showed high efficiency in the homo-coupling of primary amines and cross-coupling of benzylamine with anilines and aliphatic amines to the corresponding imines under air and solvent-free conditions. This protocol is an atom-economical green process and tolerates various substrates bearing both electron-donating and electron-withdrawing substituents.

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