Demeton-''S''-methyl

Demeton-S-methyl^[1]

Names
IUPAC name O,O-Dimethyl S-2-(ethylsulfanyl)ethyl phosphorothioate
Other names 1-(Dimethoxyphosphorylthio)-2-(ethylthio)ethane S-[2-(Ethylthio)ethyl] O,O-dimethyl phosphorothioate, Demeton methyl; O,O-Dimethyl 2-ethylmercaptoethyl thiophosphate; Metasystox; Methyl mercaptophos; Methyl systox
Identifiers
CAS Number	919-86-8 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:38624 Y
ChemSpider	12938 Y
ECHA InfoCard	100.011.866
KEGG	C18655 Y
PubChem CID	13526
InChI InChI=1S/C6H15O3PS2/c1-4-11-5-6-12-10(7,8-2)9-3/h4-6H2,1-3H3 Y Key: WEBQKRLKWNIYKK-UHFFFAOYSA-N Y InChI=1/C6H15O3PS2/c1-4-11-5-6-12-10(7,8-2)9-3/h4-6H2,1-3H3 Key: WEBQKRLKWNIYKK-UHFFFAOYAF
SMILES O=P(OC)(SCCSCC)OC
Properties
Chemical formula	C6H15O3PS2
Molar mass	230.28 g/mol
Appearance	Oily, colorless to pale-yellow liquid[2]
Density	1.2 g/cm3
Boiling point	118 °C (244 °F; 391 K)
Solubility in water	0.33 g/100 ml (20 °C)
Vapor pressure	0.0004 mmHg (20°C)[2]
Hazards
R-phrases (outdated)	R24/25 R51/53
S-phrases (outdated)	(S1/2) S28 S36/37 S45 S61
US health exposure limits (NIOSH):
PEL (Permissible)	N.D.[2]
REL (Recommended)	TWA 0.5 mg/m3 [skin][2]
IDLH (Immediate danger)	N.D.[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Demeton-S-methyl is an organic compound with the molecular formula C₆H₁₅O₃PS₂. It was used as an organothiophosphate acaricide and organothiophosphate insecticide. It is flammable. With prolonged storage, Demeton-S-methyl becomes more toxic due to formation of a sulfonium derivative which has greater affinity to the human form of the acetylcholinesterase enzyme, and this may present a hazard in agricultural use.^[3]

See also

• Demeton

References