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Dimethylphosphite
Names
	Preferred IUPAC name Dimethyl phosphonate
	Other names Phosphonic acid, dimethyl ester
Identifiers
CAS Number	868-85-9 ;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL65359;
ChemSpider	85582;
ECHA InfoCard	100.011.622
PubChem CID	94853;
UNII	ST4TBO000H ;
CompTox Dashboard (EPA)	DTXSID5020493 ;
	InChI InChI=1S/C2H7O3P/c1-4-6(3)5-2/h3H,1-2H3 Key: DLQDGVZAEYZNTG-UHFFFAOYSA-N;
	SMILES COP(O)OC;
Properties
Chemical formula	C2H7O3P
Molar mass	110.049 g·mol−1
Appearance	colorless liquid
Density	1.20 g/cm3
Boiling point	72–73 °C (162–163 °F; 345–346 K) 25 Torr
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Dimethylphosphite is an organophosphorus compound with the formula (CH₃O)₂P(O)H, known as dimethyl hydrogen phosphite (DMHP). Dimethylphosphite, is a minor tautomer of the phosphorus(V) derivative. It is a reagent for generating other organophosphorus compounds, exploiting the high reactivity of the P-H bond. The molecule is tetrahedral. It is a colorless liquid. The compounds can be prepared by methanolysis of phosphorus trichloride or by heating diethylphosphite in methanol.^[1]

Although studies have not been reported for this compound, the closely related diethylphosphite exists predominantly as the phosphorus(V) tautomer.^[2]