Demeton-S-methyl

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.

Demeton-S-methyl
Names
Preferred IUPAC name
S-[2-(Ethylsulfanyl)ethyl] O,O-dimethyl 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
3D model (JSmol)
1707311
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.011.866
EC Number
  • 213-052-6
KEGG
RTECS number
  • TG1750000
UNII
UN number 3018
  • 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
  • O=P(OC)(SCCSCC)OC
Properties
C6H15O3PS2
Molar mass 230.28 g/mol
Appearance Oily, colorless to pale-yellow liquid
Density 1.2 g/cm3
Boiling point 118 °C (244 °F; 391 K)
0.33 g/100 ml (20 °C (68 °F; 293 K))
Vapor pressure 0.0004 mmHg (20 °C (68 °F; 293 K))
Hazards
GHS labelling:
Danger
H301, H311, H411
P264, P270, P273, P280, P301+P310, P302+P352, P312, P321, P322, P330, P361, P363, P391, P405, P501
NIOSH (US health exposure limits):
PEL (Permissible)
 N.D.
REL (Recommended)
 TWA 0.5 mg/m3 [skin]
IDLH (Immediate danger)
 N.D.
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references
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