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Substance Name: Demeton-O [BSI:ISO]
RN: 298-03-3

Classification Codes

  • Agricultural Chemical
  • Insecticide
  • Mutation Data

Molecular Formula

  • C8-H19-O3-P-S2

Molecular Weight

  • 258.3411
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Names and Synonyms

Name of Substance

  • Demeton-O [BSI:ISO]


  • 4-01-00-02446 (Beilstein Handbook Reference)
  • BRN 1709115
  • Demeton-O
  • Demetonthione
  • Di-septon
  • Diaethylthiophosphorsaeureester des aethylthioglykol
  • Diaethylthiophosphorsaeureester des aethylthioglykol [German]
  • Diethyl 2-(ethylthio)ethyl phosphorothionate
  • EINECS 206-053-8
  • Ethanol, 2-(ethylthio)-, O-ester with O,O-diethyl phosphorothioate
  • NSC 8928
  • O,O-Diethyl O-(2-(ethylthio)ethyl) phosphorothionate
  • O,O-Diethyl O-2-(ethylthio)ethyl phosphorothioate
  • Thiolmecaptophos
  • UNII-8H0T22KH9W

Systematic Names

  • Demeton-O
  • Phosphorothioic acid, O,O-diethyl ester O-(2-(ethylthio)ethyl) ester
  • Phosphorothioic acid, O,O-diethyl O-(2-(ethylthio)ethyl) ester

Registry Numbers

CAS Registry Number

  • 298-03-3


  • 8H0T22KH9W

System Generated Number

  • 0000298033

Structure Descriptors








Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
hamster LD50 intraperitoneal 10mg/kg (10mg/kg)   Archives of Toxicology. Vol. 58, Pg. 152, 1986.
mouse LD50 subcutaneous 15mg/kg (15mg/kg)   Naunyn-Schmiedeberg's Archiv fuer Experimentelle Pathologie und Pharmakologie. Vol. 217, Pg. 144, 1953.
mouse LDLo oral 12mg/kg (12mg/kg)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 2(5), Pg. 7, 1958.
rabbit LDLo skin 100mg/kg (100mg/kg)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 2(5), Pg. 7, 1958.
rat LD50 oral 7500ug/kg (7.5mg/kg)   Guide to the Chemicals Used in Crop Protection. Vol. 6, Pg. 161, 1973.

Physical Properties

Physical Property Value Units Temp (deg C) Source
log P (octanol-water) 3.210 (none)   EST
Water Solubility 60 mg/L   EXP
Atmospheric OH Rate Constant 1.33E-10 cm3/molecule-sec 25 EST

Physical property data is provided to ChemIDplus by SRC, Inc.