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Under acidic conditions, an amine is not a strong nucleophile, since it will be protonated and have no lone pair to go shopping for positive charge.
 
On the other hand, under less acidic conditions (pH 4.7), primary amines can react with carbonyls to form imines: H2N-Z + CHO -> RC=N-Z + H2O, which can then be reduced to the secondary amine.
 
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