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Rodenticides, nematicides and other pesticides

(±)-Coumachlor

Also known as Coumachlor, Tomorin, Ratilan

CAS 81-82-3Formula C19H15ClO4Molar mass 342.78 g/molEC 201-378-1
GHS signal word: Warning. Pictograms: Serious health hazard 2 suppliers listed
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(±)-Coumachlor chemical structure, C19H15ClO4, CAS 81-82-3
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless, crystalline solid
Melting point
169 to 171
Solubility
In water, 5 mg/l @ 20 °C.
HS code
293220
Category
Rodenticides, nematicides and other pesticides
Illustrative photo, colourless crystals in small glass vials on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is (±)-Coumachlor?

Plain description, key identifiers and synonyms

Coumachlor is a hydroxycoumarin.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3-[1-(4-chlorophenyl)-3-oxobutyl]-4-hydroxychromen-2-one
CAS number
81-82-3 CAS number cross-checked
EC number
201-378-1
Molecular formula
C19H15ClO4
UNII
UCD8XZW42P
MDL number
MFCD00012094
InChIKey
DEKWZWCFHUABHE-UHFFFAOYSA-N
InChI
InChI=1S/C19H15ClO4/c1-11(21)10-15(12-6-8-13(20)9-7-12)17-18(22)14-4-2-3-5-16(14)24-19(17)23/h2-9,15,22H,10H2,1H3
SMILES (canonical and isomeric)
CC(=O)CC(C1=CC=C(C=C1)Cl)C2=C(C3=CC=CC=C3OC2=O)O

Synonyms

  • Coumachlor
  • Tomorin
  • Ratilan
  • Cumachlor
  • Coumachlore
  • Cumachloor
  • Kumachlor
  • Experimental rodenticide 332
  • Geigy rodenticide exp. 332
  • 3-(1-Acetyl-2-(p-chlorophenyl)ethyl)-4-hydroxycoumarin
  • 3-(alpha-Acetonyl-4-chlorobenzyl)-4-hydroxycoumarin
  • 3-(alpha-Acetonyl-p-chlorobenzyl)-4-hydroxycoumarin
  • 3-(1-(4-Chlorophenyl)-3-oxobutyl)-4-hydroxy-2H-1-benzopyran-2-one
  • 3-(1-(4-Chlorophenyl)-3-oxobutyl)-4-hydroxycoumarin
  • 4-Hydroxy-3-(1-(4-chlorophenyl)-3-oxobutyl)-2H-1-benzopyran-2-one
  • 2H-1-Benzopyran-2-one, 3-[1-(4-chlorophenyl)-3-oxobutyl]-4-hydroxy-
  • 3-(alpha-p-Chlorophenyl-beta-acetylethyl)-4-hydroxycoumarin
  • 3-[1-(4-Chlorophenyl)-3-oxobutyl]-4-hydroxy-2H-1-benzopyran-2-one
  • 2H-1-Benzopyran-2-one, 3-(1-(4-chlorophenyl)-3-oxobutyl)-4-hydroxy-
  • 5-18-04-00163 (Beilstein Handbook Reference)
  • 3-((alpha-Acetonyl)-4-chlorbenzyl)-4-hydroxycumarin
  • Coumarin, 3-(alpha-acetonyl-p-chlorobenzyl)-4-hydroxy-
  • (+-)-Coumachlor
  • (+/-)-Coumachlor
  • 3-(1-(4-Chlorophenyl)-3-oxobutyl)-4-hydroxy-2H-chromen-2-one
Show all 32 synonyms
  • 3-[1-(4-chlorophenyl)-3-oxobutyl]-4-hydroxychromen-2-one
  • p-Chlorowarfarin
  • 3-(1-(4-Chloorfenyl)-3-oxo-butyl)-4-hydroxy-cumarine
  • 3-(1-(4-Chlor-phenyl)-3-oxo-butyl)-4-hydroxy-cumarin
  • 3-(1-(4-Cloro-fenil)-3-oxo-butil)-4-idrossicumarina
  • 3-(1-(4-Chlorophenyl)-3-oxo-butyl)-4-hydroxy-coumarine
  • dl-3-(alpha-Acetonyl-4-chlorobenzyl)-4-hydroxycoumarin

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, crystalline solidexp.
Melting point
169 to 171exp.
Solubility
In water, 5 mg/l @ 20 °C.exp.

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
342.78 g/molcalc.
Exact mass
342.0659 Dacalc.
LogP (octanol/water)
4.26calc.
Topological polar surface area
67.51 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
4calc.
Heavy atoms
24calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.16calc.
Formal charge
0calc.
Stereocentres
1calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=c1oc2ccccc2cc1Cc1ccccc1

O=c1oc2ccccc2cc1Cc1ccccc1

3 rings, 18 atoms, the 3-Benzyl-2H-1-benzopyran-2-one ring system.

221 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H373May cause damage to organs through prolonged or repeated exposure.
  • H412Harmful to aquatic life with long lasting effects.
Precautionary statements (4)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P273Avoid release to the environment.
  • P319Get medical help if you feel unwell.
  • P501Dispose of contents and container in accordance with local regulations.

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

(±)-Coumachlor suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 2 suppliers

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Where suppliers are based

2 suppliers in 2 countries

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(±)-Coumachlor price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Rodenticide.

Pharmacological actions

  • Anticoagulants
  • Rodenticides

How it is made

Preparation: F. Litvan, W. Stoll, US 2648682 (1953 to J. R. Geigy).

Coumachlor is made by the condensation of 3-carbethoxy-4-hydroxycoumarin and p-chlorobenzalacetone.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 607-057-00-6

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code (±)-Coumachlor is traded under.

HS 2932.20Indicative HS code

Lactones

World exports in 2024
$1.97B
−4.7% vs 2023, imports $2.07B
2019 to 2024
Top exporters
  1. China56.3%
  2. India * partner reported7.4%
  3. Germany7.3%
Top importers
  1. United States14.2%
  2. India * partner reported13.5%
  3. Brazil8.5%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about (±)-Coumachlor, based on the data on this page

What is (±)-Coumachlor?

Coumachlor is a hydroxycoumarin.

What is the CAS number of (±)-Coumachlor?

The CAS registry number of (±)-Coumachlor is 81-82-3.

What is the molecular formula and weight of (±)-Coumachlor?

The molecular formula of (±)-Coumachlor is C19H15ClO4 and its molar mass is 342.78 g/mol.

What is (±)-Coumachlor used for?

Rodenticide.

Is (±)-Coumachlor hazardous?

(±)-Coumachlor carries the GHS signal word "Warning". Main hazards: may cause damage to organs through prolonged or repeated exposure, harmful to aquatic life with long lasting effects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of (±)-Coumachlor?

(±)-Coumachlor is usually classified under HS code 293220 (Lactones). This is indicative, confirm it with your customs broker before shipping.

Where can I buy (±)-Coumachlor?

CompoundList lists 2 suppliers of (±)-Coumachlor in China and Germany. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of (±)-Coumachlor?

Suppliers quote (±)-Coumachlor 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 (±)-Coumachlor

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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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