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The Lys-promoted reaction of aldehydes in water or under solvent-free conditions has furnished the corresponding condensation products in good yields. The reaction takes place in the emulsion media, which assemble both lipophilic aldehydes and hydrophilic Lys in the same specific micelles, resulting in the promotion of smooth reaction, in spite of an aqueous system.This process is environmentally benign and applicable to various aldehydes, especially to long-chain aldehydes. Therefore, the procedure would provide a practical synthetic method for the self-condensation of aldehydes.

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