TRISPHAT
Tributylammonium TRISPHAT is an organic salt with the formula. The anion features phosphorus bonded to three tetrachlorocatecholate ligands. This anion can be resolved into the enantiomers, which are optically stable.
The TRISPHAT anion has been used as a chiral shift reagent for cations. It improves the resolution of 1H NMR spectra by forming diastereomeric ion pairs.Preparation
The anion is prepared by treatment of phosphorus pentachloride with tetrachlorocatechol followed by a tertiary amine gives the anion:
H + Bu3N Bu3NH+ −
Using a chiral amine, the anion can be readily resolved.
