Other Phosphonium Salts
Other Phosphonium Salts
Phosphonium salts refers to a quaternary organic derivative of phosphorus such as tetramethylphosphonium iodide, [P(CH3)4]+I-. Phosphonium salts are used as ionic liquids with higher thermal stability, for example, trialkyl(2,3-dihydroxypropyl)phosphonium salts (Bellina, F.; Chiappe, C.; Lessi, M. Synthesis and properties of trialkyl(2,3-dihydroxypropyl)phosphonium salts, a new class of hydrophilic and hydrophobic glyceryl-functionalized ILs. Green Chem. 2012, 14, 148-155). Phosphonium salts are known for their use as reagents and catalysts in organic synthesis. Phosphonium salts are used as a precursor for the Wittig reagent, more specifically alkyltriphenylphosphonium salts are used in the preparation of Wittig reagents which are useful in pharmaceuticals, agrochemicals, functional chemicals, and their intermediates. Phosphonium salts are also useful as a precursor for various organometallic compounds. Stable phosphonium salts are precursors for phosphine ligands and are transformed to phosphines in situ when required. The phosphonium phenylthioacetates are known as efficient co-initiators for the photo-induced free-radical polymerization of vinyl polymers.
