3,3′,3′′-Phosphanetriyltris(benzenesulfonic acid) trisodium salt (abbreviated TPPTS), is an organic compound that is also known as sodium triphenylphosphine trisulfonate.

It is the phosphonium salt that undergoes the sulfonation which explains its meta selectivity: As a Lewis base, tppts is stronger than triphenylphosphine.

TPPTS was first synthesized in 1975 by E.G Kuntz who was an engineer at Rhône-Poulenc with the aim of carrying out a two-phase homogeneous catalysis in which the aqueous phase catalyst could be easily separated from the reaction products and recycled.

Tppts-based rhodium catalysts were introduced in 1984 for a two-phase hydroformylation of propene by the Ruhrchemie / Rhône-Poulenc process.

Traditionally, hydroformylation is catalyzed by rhodium or cobalt complexes in nonaqueous solution[13] The industrial use of Tppts and homogeneous biphasic catalysis were mostly ignored in academic research until E.G. Kuntz published a review of its previous work in 1987.