Phosphite
Hydrogen Phosphite is an ion. Its chemical formula is HPO32-. It contains phosphorus in its +3 oxidation state. Chemical compounds containing the phosphite ion are called phosphites. Phosphites are the salts of phosphorous acid. They are poisonous. They are reducing agents. An example would be sodium phosphite.
Phosphite Media
Tris(2,4-di-tert-butylphenyl)phosphite, a widely used stabilizer in polymers
BiPhePhos is representative diphosphite ligand used in homogeneous catalysis.