Methylphosphonyl difluoride

Methylphosphonyl difluoride
Names
	Preferred IUPAC name Methylphosphonic difluoride
	Other names Methylphosphonyl difluoride; Methylphosphonoyl difluoride, EA-1251
Identifiers
CAS Number	676-99-3 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	4-04-00-03508
ChemSpider	62813;
MeSH	difluoride Methylphosphonic difluoride
PubChem CID	69610;
UNII	Z7V517240K ;
CompTox Dashboard (EPA)	DTXSID5060980 ;
	InChI InChI=1S/CH3F2OP/c1-5(2,3)4/h1H3 Key: PQIOSYKVBBWRRI-UHFFFAOYSA-N;
	SMILES CP(F)(F)=O;
Properties
Chemical formula	CH3POF2
Molar mass	100.00
Appearance	Colorless liquid
Odor	Pungent, acid-like
Density	1.359 g/mL (77°F)
Melting point	−37 °C; −35 °F; 236 K
Boiling point	100 °C; 212 °F; 373 K
Solubility in water	Decomposes
Vapor pressure	36 mmHg (77°F)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Corrosive, toxic
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Methylphosphonyl difluoride (DF), also known as EA-1251 or difluoro, is a chemical weapon precursor. Its chemical formula is CH₃POF₂. It is a Schedule 1 substance under the Chemical Weapons Convention. It is used for production of sarin and soman as a component of binary chemical weapons; an example is the M687 artillery shell, where it is used together with a mixture of isopropyl alcohol and isopropyl amine, producing sarin.

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