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Insecticides and acaricides

Chlormephos

Also known as Chlormefos, Chlormethylfos, Dotan

CAS 24934-91-6Formula C5H12ClO2PS2Molar mass 234.71 g/molEC 246-538-1
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Hazardous to the environment
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Chlormephos chemical structure, C5H12ClO2PS2, CAS 24934-91-6
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless liquid
Boiling point
81 to 85
Density
Relative density (water = 1): 1.26
Flash point
>100
Solubility
60 mg/l water at 20 °C
HS code
293090
Category
Insecticides and acaricides
UN number
UN 3018
Illustrative photo, an amber glass solvent bottle with clear liquid on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Chlormephos?

Plain description, key identifiers and synonyms

Chlormephos is an organochlorine insecticide, an organothiophosphate insecticide and an organic thiophosphate. It has a role as an agrochemical and an EC 3.1.1.7 (acetylcholinesterase) inhibitor.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
chloromethylsulfanyl-diethoxy-sulfanylidene-λ5-phosphane
CAS number
24934-91-6 CAS number cross-checked
EC number
246-538-1
Molecular formula
C5H12ClO2PS2
UNII
1N10F47JUS
MDL number
MFCD00055471
InChIKey
QGTYWWGEWOBMAK-UHFFFAOYSA-N
InChI
InChI=1S/C5H12ClO2PS2/c1-3-7-9(10,8-4-2)11-5-6/h3-5H2,1-2H3
SMILES (canonical and isomeric)
CCOP(=S)(OCC)SCCl

Synonyms

  • Chlormefos
  • Chlormethylfos
  • Dotan
  • S-Chloromethyl O,O-diethyl phosphorodithioate
  • Phosphorodithioic acid, S-(chloromethyl) O,O-diethyl ester
  • MC 2188
  • S-(chloromethyl) O,O-diethyl phosphorodithioate
  • S-(Chloromethyl) O,O-diethylphosphorodithioate
  • S-(Chloromethy) O,O-diethyl phosphorodithioate
  • S-Chloromethyl-O,O-diethylphosphorothiolothionate
  • S-(Chloromethyl) o,o-diethyl dithiophosphate
  • 4-01-00-03088 (Beilstein Handbook Reference)
  • O,O-Diethyl S-(Chloromethyl)dithiophosphate
  • S-Chloromethyl O,O-diethyl phosphorothiolothionate
  • S-(Chloromethyl) O,O-Diethyl phosphorothiolothionate
  • Methanethiol, chloro-, S-ester with O,O-diethyl phosphorodithioate
  • Clormethylphos
  • Chlormephos-ethyl
  • SChloromethyl O,Odiethyl phosphorodithioate
  • S(Chloromethyl) O,Odiethylphosphorodithioate
  • S(Chloromethy) O,Odiethyl phosphorodithioate
  • SChloromethylO,Odiethylphosphorothiolothionate
  • O,O-Diethyl S-(chloromethyl) dithiophosphate
  • Phosphorodithioic acid, S(chloromethyl) O,Odiethyl ester
  • Phosphorodithioic acid, S-(chloromethyl) O,O-dimethyl ester
Show all 31 synonyms
  • chloromethylsulfanyl-diethoxy-sulfanylidene-lambda5-phosphane
  • C5H12ClO2PS2
  • Chlormephos 1000 microg/mL in Acetonitrile
  • Chlormefos, PESTANAL(R), analytical standard
  • S-(Chloromethyl) O,O-diethyl dithiophosphate #
  • chloromethylsulfanyl-diethoxy-thioxo-lambda5-phosphane

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Colorless liquidexp.
Boiling point
81 to 85exp.
Density
Relative density (water = 1): 1.26exp.
Flash point
>100exp.
Solubility
60 mg/l water at 20 °Cexp.
Vapour pressure
7.6 Pa at 30 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
234.71 g/molcalc.
Exact mass
233.9705 Dacalc.
LogP (octanol/water)
3.21calc.
Topological polar surface area
18.46 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
6calc.
Heavy atoms
11calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H300Fatal if swallowed.
  • H310Fatal in contact with skin.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (14)
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3018
Transport hazard class
6.1
Packing group
I

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Chlormephos suppliers

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Chlormephos price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Non-systemic insecticide with contact and some stomach action.

Soil insecticide.

Roles

  • agrochemical
  • enzyme inhibitor

How it is made

Produced by reaction of an alkali salt of diethyl dithiophosphoric acid and bromochlormethane.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 015-114-00-6

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Chlormephos is traded under.

HS 2930.90Indicative HS code

Organo-sulphur compounds, other

World exports in 2024
$5.83B
+0.1% vs 2023, imports $5.93B
2019 to 2024
Top exporters
  1. China40.7%
  2. United States10.9%
  3. Japan9.3%
Top importers
  1. United States13.3%
  2. Brazil12.6%
  3. China6.6%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Chlormephos is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Chlormephos, based on the data on this page

What is Chlormephos?

Chlormephos is an organochlorine insecticide, an organothiophosphate insecticide and an organic thiophosphate. It has a role as an agrochemical and an EC 3.1.1.7 (acetylcholinesterase) inhibitor.

What is the CAS number of Chlormephos?

The CAS registry number of Chlormephos is 24934-91-6.

What is the molecular formula and weight of Chlormephos?

The molecular formula of Chlormephos is C5H12ClO2PS2 and its molar mass is 234.71 g/mol.

What is Chlormephos used for?

Non-systemic insecticide with contact and some stomach action. Soil insecticide.

Is Chlormephos hazardous?

Chlormephos carries the GHS signal word "Danger". Main hazards: fatal if swallowed, fatal in contact with skin, very toxic to aquatic life. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Chlormephos?

Chlormephos is usually classified under HS code 293090 (Organo-sulphur compounds, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Chlormephos?

Post a free request on CompoundList and suppliers of Chlormephos will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Chlormephos?

Suppliers quote Chlormephos on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Chlormephos

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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