An improved method for the synthesis of cyclic low oxidation state P cations is presented. The only byproducts of the reaction of phosphorus triiodide with chelating phosphines are readily removed, resulting in an easily accessible P-I reagent with an anion that can be readily replaced through salt metathesis chemistry. These P-I salts are surprisingly stable, even in O-2 and moisture, and the origin of this unusual stability is elucidated using density functional theory calculations.
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