Methylphosphonic acid

Methylphosphonic acid is an organophosphorus compound with the chemical formula. CH3P(O)(OH)2. The phosphorus center is tetrahedral and is bonded to a methyl group, two OH groups and an oxygen. Methylphosphonic acid is a white, non-volatile solid that is poorly soluble in organic solvent but soluble in water and common alcohols.[2]

Methylphosphonic acid
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.012.370
EC Number
  • 213-607-2
KEGG
MeSH C032627
UNII
Properties
CH5O3P
Molar mass 96.02
Appearance White Solid
Melting point 105 to 107 °C (221 to 225 °F; 378 to 380 K)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Preparation

Methylphosphonic acid can be prepared via the Michaelis-Arbuzov reaction from triethylphosphite:[3]

CH3Cl + P(OC2H5)3 → CH3PO(OC2H5)2 + C2H5Cl

The dialkylphosphonate is then treated with chlorotrimethylsilane:

CH3PO(OC2H5)2 + 2 Me3SiCl → CH3PO(OSiMe3)2 + 2 C2H5Cl

The siloxyphosphinate is then hydrolyzed:

CH3PO(OSiMe3)2 + 2H2O → CH3PO(OH)2 + 2 HOSiMe3
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References

  1. "Methylphosphonic Acid". Sigma-Aldrich. Retrieved 12 December 2013.
  2. "methylphosphonic acid - Compound Summary". NCBI. Retrieved 12 December 2013.
  3. Katritzky, Pilarski, Alan, Boguslaw. "A One-Pot Procedure For the Preparation of Phosphonic Acids From Alkyl Halides" (PDF). Archived from the original (PDF) on 23 September 2015. Retrieved 12 December 2013.
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