2-Diphenylphosphinobenzoic acid is an organophosphorus compound with the formula (C6H5)2PC6H4CO2H.

It is a white solid that dissolves in polar organic solvents.

The ligand is a component of catalysts used for the Shell higher olefin process.

[1] It is prepared by the reaction of sodium diphenylphosphide with the sodium salt of 2-chlorobenzoic acid.

[2]