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Methylphosphonic acid

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Methylphosphonic acid httpsuploadwikimediaorgwikipediacommonsthu

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.

Preparation

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

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

References

Methylphosphonic acid Wikipedia
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