Phosphonites are ligands.
Although they are derivivatives of phosphonous acid (RP(OH)2), they are not prepared from such precursors. Phosphonites are prepared by dichlorophenylphosphine with methanol and base gives dimethyl phenylphosphonite:
- Cl2PPh + 2 CH3OH → (CH3O)2PPh + 2 HCl
Oxidation of phosphonites gives phosphonates:
- 2 P(OR)2R + O2 → 2 OP(OR)2R
- D. E. C. Corbridge "Phosphorus: An Outline of its Chemistry, Biochemistry, and Technology" 5th Edition Elsevier: Amsterdam 1995. ISBN 0-444-89307-5.
- IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "phosphonous acids".
- T. V. (Babu) Rajanbabu “Phosphinite and Phosphonite Ligands” in Phosphorus(III) Ligands in Homogeneous Catalysis: Design and Synthesis Paul C. J. Kamer and Piet W. N. M. van Leeuwen, Eds., John Wiley & Sons 2012. doi:10.1002/9781118299715.ch5