O,O-Dimethyl S-2-(ethylsulfanyl)ethyl phosphorothioate
S-[2-(Ethylthio)ethyl] O,O-dimethyl phosphorothioate, Demeton methyl; O,O-Dimethyl 2-ethylmercaptoethyl thiophosphate; Metasystox; Methyl mercaptophos; Methyl systox
3D model (JSmol)
|Molar mass||230.28 g/mol|
|Appearance||Oily, colorless to pale-yellow liquid|
|Boiling point||118 °C (244 °F; 391 K)|
|0.33 g/100 ml (20 °C)|
|Vapor pressure||0.0004 mmHg (20°C)|
|R-phrases (outdated)||R24/25 R51/53|
|S-phrases (outdated)||(S1/2) S28 S36/37 S45 S61|
|US health exposure limits (NIOSH):|
|TWA 0.5 mg/m3 [skin]|
IDLH (Immediate danger)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
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 at INCHEM
- "NIOSH Pocket Guide to Chemical Hazards #0410". National Institute for Occupational Safety and Health (NIOSH).
- Black RM, Harrison JM. The chemistry of organophosphorus chemical warfare agents. Chapter 10 of The chemistry of organophosphorus compounds. Volume 4, Ter- and quinque-valent phosphorus acids and their derivatives. (1996) ISBN 0-471-95706-2
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