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Ring opening of aziridine with dialkyl amine took place readily in the presence of catalytic amounts of tri-n-butylphosphane (10 mol％) in the mixture of CH3CN/H2O (10:1),giving corresponding vicinal diamines in mediate to high yields (58-95％) with good regioselecfivifie,while aromatic secondary amine could not react under the same condifions.Tti-n-butylphosphane exhibited different catalytic selectivity to amines from Lewis acid catalysts.