A facile, high-yielding, one-step procedure is described for the preparation of a wide range of stable iminium salts by direct combination of an aldehyde or a ketone with a secondary free amine in the presence of an ammonium salt. The broad scope of the method is illustrated by the preparation of iminium ions derived from aldehydes, cyclic/acyclic ketones, and cyclic/acyclic secondary amines.
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