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Substance Name: Potasan
RN: 299-45-6
UNII: S270N91705

Classification Codes

  • Agricultural Chemical
  • Insecticide
  • Out-Dated Pesticide

Molecular Formula

  • C14-H17-O5-P-S

Molecular Weight

  • 328.3233
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Names and Synonyms

Results Name

  • Potasan

Name of Substance

  • Hymecromone O,O-diethyl phosphorothioate


  • 4-18-00-00343 (Beilstein Handbook Reference)
  • 4-Methyl-7-hydroxycoumarin diethoxythiophosphate
  • 4-Methylumbelliferone-O,O-diethyl thiophosphate
  • 7-Hydroxy-4-methylcoumarin, O,O-diethyl thiophosphoric acid ester
  • 7-Hydroxy-4-methylcoumarin, O-ester with O,O-diethyl phosphorothioate
  • AI3-17296
  • Bayer E-838
  • BRN 0307407
  • Diethoxy thiophosphoric acid ester of 7-hydroxy-4-methyl coumarin
  • Diethyl (4-methylumbelliferyl) thionophosphate
  • Diethyl methylcoumarinyl thiophosphate
  • E 834
  • E 838
  • ENT 17,296
  • Farbenfabriken bayer
  • Hymecromone O,O-diethyl phosphorothioate
  • O,O-Diaethyl-O-(4-methyl-coumarin-7-yl)-monothiophosphat
  • O,O-Diaethyl-O-(4-methyl-coumarin-7-yl)-monothiophosphat [German]
  • O,O-Diethyl O-(2-keto-4-methyl-7-alpha',beta'-benzo-alpha'-pyranyl) thiophosphate
  • O,O-Diethyl O-(4-methyl-7-coumarinyl) phosphorothioate
  • O,O-Diethyl O-(4-methyl-7-coumarinyl) thionophosphate
  • O,O-Diethyl O-(4-methylcoumarinyl-7) thiophosphate
  • O,O-Diethyl O-(4-methylumbelliferone) ester of thiophosphoric acid
  • O,O-Diethyl O-(4-methylumbelliferone) phosphorothioate
  • O,O-Diethyl-O-(4-methyl-7-kumarinyl) ester kyseliny thiofosforescne
  • O,O-Diethyl-O-(4-methyl-7-kumarinyl) ester kyseliny thiofosforescne [Czech]
  • O,O-Diethyl-O-(4-methylcoumarin-7-yl)-monothiofosfaat
  • O,O-Diethyl-O-(4-methylcoumarin-7-yl)-monothiofosfaat [Dutch]
  • O,O-Dietil-O-(4-metilcumarin-7-il)-monotiofosfato
  • O,O-Dietil-O-(4-metilcumarin-7-il)-monotiofosfato [Italian]
  • O,O-Dietyl-O-4-methylkumarinyl(7)tiofosfat
  • O,O-Dietyl-O-4-methylkumarinyl(7)tiofosfat [Czech]
  • Phosphorothioic acid, O,O-diethyl ester, O-ester with 7-hydroxy-4-methylcoumarin
  • Potasan
  • Potasan-G-liquid
  • Thiophosphate de O,O-diethyle et de O-(4-methyl-7-coumarinyle)
  • Thiophosphate de O,O-diethyle et de O-(4-methyl-7-coumarinyle) [French]
  • UNII-S270N91705

Systematic Names

  • Coumarin, 7-hydroxy-4-methyl-, O-ester with O,O-diethyl phosphorothioate
  • Phosphorothioic acid, O,O-diethyl O-(4-methyl-2-oxo-2H-1-benzopyran-7-yl) ester (9CI)

Registry Numbers

CAS Registry Number

  • 299-45-6


  • S270N91705

System Generated Number

  • 0000299456

Structure Descriptors








Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
guinea pig LD50 oral 25mg/kg (25mg/kg)   Journal of Pharmacology and Experimental Therapeutics. Vol. 105, Pg. 156, 1952.
mouse LD50 oral 99mg/kg (99mg/kg)   Journal of Pharmacology and Experimental Therapeutics. Vol. 105, Pg. 156, 1952.
mouse LD50 subcutaneous 25mg/kg (25mg/kg)   Pharmacological Reviews. Vol. 11, Pg. 636, 1959.
rabbit LD50 skin 300mg/kg (300mg/kg)   World Review of Pest Control. Vol. 9, Pg. 119, 1970.
rat LD50 intraperitoneal 15mg/kg (15mg/kg)   AMA Archives of Industrial Hygiene and Occupational Medicine. Vol. 6, Pg. 9, 1952.
rat LD50 oral 14700ug/kg (14.7mg/kg)   "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1169, 1986.
rat LD50 unreported 19mg/kg (19mg/kg)   "Chemistry of Pesticides," Melnikov, N.N., New York, Springer-Verlag New York, Inc., 1971Vol. -, Pg. 340, 1971.

Physical Properties

Physical Property Value Units Temp (deg C) Source
Melting Point 38 deg C   EXP
log P (octanol-water) 3.980 (none)   EST
Water Solubility 3.330 mg/L 25 EST
Vapor Pressure 2.50E-07 mm Hg 25 EST
Henry's Law Constant 1.52E-07 atm-m3/mole 25 EST
Atmospheric OH Rate Constant 1.26E-10 cm3/molecule-sec 25 EST

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