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Abstract
In the singlet state phosphenium cations feature both a vacant orbital and a lone pair at the phosphorus center (1). The anticipated amphoterism property of these species can be used for the synthesis of unusual heterocyclic derivatives. Our interest (2) in this type of chemistry bring us to report the reactions of stable phosphenium ions with unsaturated organic reactives i.e imines, a diimines, amidines and isocyanides.