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Phosphonite

Organic compounds with the formula P(OR)2R

General ester of phosphonous acid

Note

Not to be confused with phosphinite (formula P(OR)R2).

In organic chemistry, phosphonites are organophosphorus compounds with the formula P(OR)2R. They are found in some pesticides and are used as ligands.

Preparation

Although they are derivatives of phosphonous acid (RP(OH)2), they are not prepared from such precursors. Phosphonites are prepared by alcoholysis of organophosphinous chlorides. For example, treatment of dichlorophenylphosphine with methanol and base gives dimethyl phenylphosphonite: :Cl2PPh + 2 CH3OH → (CH3O)2PPh + 2 HCl

Reactions

Oxidation of phosphonites gives phosphonates: :2 P(OR)2R + O2 → 2 OP(OR)2R

Phosphonites can function as ligands in homogeneous catalysis.

References

D. E. C. Corbridge "Phosphorus: An Outline of its Chemistry, Biochemistry, and Technology" 5th Edition Elsevier: Amsterdam 1995. {{ISBN. 0-444-89307-5.
"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

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functional-groups phosphonites

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