Methylphosphonic acid

Methylphosphonic acid

Identifiers
CAS Number	993-13-5
3D model (Jmol)	Interactive image
ChEBI	CHEBI:45129
ChemSpider	13220
ECHA InfoCard	100.012.370
EC Number	213-607-2
KEGG	C20396
MeSH	C032627
PubChem CID	13818
InChI InChI=1S/CH5O3P/c1-5(2,3)4/h1H3,(H2,2,3,4) Key: YACKEPLHDIMKIO-UHFFFAOYSA-N InChI=1/CH5O3P/c1-5(2,3)4/h1H3,(H2,2,3,4) Key: YACKEPLHDIMKIO-UHFFFAOYAB
SMILES CP(=O)(O)O
Properties
Chemical formula	CH5O3P
Molar mass	96.02
Appearance	White Solid
Melting point	105 to 107 °C (221 to 225 °F; 378 to 380 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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.

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

The dialkylphosphonate is then treated with chlorotrimethylsilane:

The siloxyphosphinate is then hydrolyzed: