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Substance Name: alpha-Endosulfan [ISO]
RN: 959-98-8


  • A polychlorinated compound used for controlling a variety of insects. It is practically water-insoluble, but readily adheres to clay particles and persists in soil and water for several years. Its mode of action involves repetitive nerve-discharges positively correlated to increase in temperature. This compound is extremely toxic to most fish. (From Comp Biochem Physiol (C) 1993 Jul;105(3):347-61) /Endosulfan/

Molecular Formula

  • C9-H6-Cl6-O3-S

Molecular Weight

  • 406.9274

Classification Codes

  • 2007 CERCLA Priority List, Rank: 57
  • 2011 CERCLA Priority List, Rank: 48
  • Reportable Quantity (RQ) = 1 lb
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Names and Synonyms

Name of Substance

  • alpha-Endosulfan [ISO]


  • a-Endosulfan-alpha
  • AI3-29021
  • alpha-Benzoepin
  • alpha-Endosulfan
  • alpha-Thiodan
  • beta-Thionex
  • CCRIS 1460
  • Endosulfan 1
  • Endosulfan A
  • Endosulfan I

Systematic Names

  • 5-Norbornene-2,3-dimethanol, 1,4,5,6,7,7-hexachloro-, cyclic sulfite, endo-
  • 6,9-Methano-2,4,3-benzodioxathiepin, 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-, 3-oxide, (3alpha,5abeta,6alpha,9alpha,9abeta)-
  • 6,9-Methano-2,4,3-benzodioxathiepin, 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-, 3-oxide, alpha-isomer (3alpha,5a beta,6alpha,9alpha,9a beta)-
  • alpha-Endosulfan

Superlist Names

  • 6,9-Methano-2,4,3-benzodioxathiepin, 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-, 3-oxide, (3alpha,5abeta,6alpha,9alpha,9abeta)-
  • alpha-Endosulfan
  • Endosulfan, alpha

Registry Numbers

CAS Registry Number

  • 959-98-8


  • QY5Y9R7G0E

Other Registry Numbers

  • 12640-58-3
  • 19595-59-6
  • 29106-31-8
  • 33213-66-0

System Generated Number

  • 0000959988

Structure Descriptors








Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mammal (species unspecified) LD50 unreported 76mg/kg (76mg/kg)   Defense des Vegetaux. Vol. 44(262), Pg. 37, 1990.
rat LD50 oral 76mg/kg (76mg/kg)   National Technical Information Service. Vol. PB85-143766,

Physical Properties

Physical Property Value Units Temp (deg C) Source
log P (octanol-water) 3.83 (none)   EXP
Water Solubility 0.51 mg/L 20 EXP
Vapor Pressure 3.00E-06 mm Hg 25 EXP
Henry's Law Constant 7.09E-06 atm-m3/mole 25 EXP
Atmospheric OH Rate Constant 8.17E-12 cm3/molecule-sec 25 EST

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