Ionic Liquids: Synthesis and Characterisation of Triphenylphosphonium Tosylates

Abstract

Ionic liquids are currently attracting considerable interest from chemists, partly due to their potential as “green” alternatives to volatile molecular organic solvents. Phosphonium ionic liquids have received much less attention than ammonium salts in the past, but the situation is changing. The salts are applied in the liquid state but in this work, salts with higher melting points than is generally the case are investigated. They are solid at room temperature, thus enabling facile separation of liquid reaction products. Nine triphenylphosphonium tosylates have been prepared and characterised; their crystal structures have been determined and their melting points have been scrutinized, showing some sensitivity to the duration of drying. The structural information is expected to be invaluable in the understanding of the properties of the molten state.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

Ionic Liquid as Surfactant Agent of Hydrotalcite: Influence on the Final Properties of Polycaprolactone Matrix

“…While attention has been devoted to ILs based on quaternary nitrogen, studies related to ILs based on quaternary phosphorous cations are still few. It has been demonstrated that some phosphonium based ILs have better properties than nitrogen-based ILs, [ 29 , 30 ]. In fact, research on nanocomposites containing clay minerals modified with phosphonium based ILs has recently increased [ 31 , 32 , 33 ].…”

(4-Carboxybenzyl)triphenylphosphonium hexafluoridophosphate tetrahydrofuran monosolvate

“…For structures of similar triphenylphosphonium compounds, see: Bonnet & Kariuki (2006) and Ibrahim et al (2011). For uses of triphenylphosphonium compounds in synthesis, see: Liang (2015).…”

Dehydration of Benzyl Alcohols in Phosphonium Ionic Liquids: Synthesis of Ethers and Alkenes

“…Phosphonium ionic liquids have been studied to a lesser extent although they possess some advantages over imidazolium ionic liquids. Phosphonium ionic liquids can be prepared without halide contamination, which is an important factor for the halogen‐sensitive reagents 6,7. Furthermore, phosphonium ionic liquids are more thermally stable than imidazolium and quaternary ammonium salts 8,9.…”