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Aromatic building blocks

2,4-Dichlorocinnamic acid, (E)-

Also known as trans-2,4-Dichlorocinnamic acid, (E)-3-(2,4-dichlorophenyl)acrylic acid, 2-Propenoic acid, 3-(2,4-dichlorophenyl)-, (2E)-

CAS 20595-45-3Formula C9H6Cl2O2Molar mass 217.05 g/molEC 214-860-1
GHS signal word: Warning. Pictograms: Harmful or irritant 2 suppliers listed
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2,4-Dichlorocinnamic acid, (E)- chemical structure, C9H6Cl2O2, CAS 20595-45-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
20595-45-3
Formula
C9H6Cl2O2
Molar mass
217.05 g/mol
EC number
214-860-1
HS code
291639
Category
Aromatic building blocks

What is 2,4-Dichlorocinnamic acid, (E)-?

Plain description, key identifiers and synonyms

2,4-Dichlorocinnamic acid, (E)- is a chemical substance with the molecular formula C9H6Cl2O2 and a molar mass of 217.05 g/mol. Its CAS registry number is 20595-45-3. The IUPAC name is (E)-3-(2,4-dichlorophenyl)prop-2-enoic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(E)-3-(2,4-dichlorophenyl)prop-2-enoic acid
CAS number
20595-45-3Other or deprecated CAS: 1201-99-6
EC numbers
214-860-1, 639-402-1
Molecular formula
C9H6Cl2O2
UNII
C09KK5D2T2
MDL number
MFCD00004373
InChIKey
MEBWABJHRAYGFW-DUXPYHPUSA-N
InChI
InChI=1S/C9H6Cl2O2/c10-7-3-1-6(8(11)5-7)2-4-9(12)13/h1-5H,(H,12,13)/b4-2+
Canonical SMILES
O=C(O)C=Cc1ccc(Cl)cc1Cl
Isomeric SMILES
C1=CC(=C(C=C1Cl)Cl)/C=C/C(=O)O

Synonyms

  • trans-2,4-Dichlorocinnamic acid
  • (E)-3-(2,4-dichlorophenyl)acrylic acid
  • 2-Propenoic acid, 3-(2,4-dichlorophenyl)-, (2E)-
  • 2,4-Dichlorocinnamic acid, trans-
  • Cinnamic acid, 2,4-dichloro-, (E)-
  • (E)-3-(2,4-Dichlorophenyl)-2-propenoic acid
  • trans-3-(2,4-Dichlorophenyl)-2-propenoic acid
  • (2E)-3-(2,4-Dichlorophenyl)-2-propenoic acid
  • 3-(2,4-Dichlorophenyl)-2-propenoic acid, (E)-
  • 2-Propenoic acid, 3-(2,4-dichlorophenyl)-, (E)-
  • (2E)-3-(2,4-Dichlorophenyl)acrylic acid
  • 3-(2,4-dichlorophenyl)acrylic acid
  • (2E)-3-(2,4-dichlorophenyl)prop-2-enoic acid
  • (E)-3-(2,4-dichlorophenyl)prop-2-enoic acid
  • (e)-2,4-dichlorocinnamic acid
  • 2,4-Dichlorocinnamicacid
  • 24-Dichlorocinnamic acid
  • (~{e})-3-(2,4-Dichlorophenyl)prop-2-Enoic Acid
  • cinnam
  • 2,4-dichloro-trans-cinnamic acid
  • Cinnamic acid,4-dichloro-, (E)-
  • trans-2,4-Dichlorocinnamic acid, 98%
  • 2-Propenoic acid,4-dichlorophenyl)-, (E)-
  • (E)-3-(2,4-Dichloro-phenyl)-acrylic acid

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
217.05 g/molcalc.
Exact mass
215.9745 Dacalc.
LogP (octanol/water)
3.09calc.
Topological polar surface area
37.3 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
2calc.
Heavy atoms
13calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
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, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • 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

2,4-Dichlorocinnamic acid, (E)- suppliers

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All 2 suppliers

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Where suppliers are based

2 suppliers in 1 country

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2,4-Dichlorocinnamic acid, (E)- price

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Uses and applications

What the substance is used for, by industry and function

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code 2,4-Dichlorocinnamic acid, (E)- is traded under.

HS 2916.39Indicative HS code

Aromatic monocarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and…

World exports in 2024
$706M
−6.8% vs 2023, imports $714M
2019 to 2024
Top exporters
  1. China49.0%
  2. India * partner reported16.2%
  3. Germany13.2%
Top importers
  1. India * partner reported14.5%
  2. United States12.2%
  3. Germany8.6%

* Partner reported figures, a lower bound.

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

The HS code shown for 2,4-Dichlorocinnamic acid, (E)- is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 2,4-Dichlorocinnamic acid, (E)-, based on the data on this page

What is 2,4-Dichlorocinnamic acid, (E)-?

2,4-Dichlorocinnamic acid, (E)- is a chemical substance with the molecular formula C9H6Cl2O2 and a molar mass of 217.05 g/mol. Its CAS registry number is 20595-45-3. The IUPAC name is (E)-3-(2,4-dichlorophenyl)prop-2-enoic acid.

What is the CAS number of 2,4-Dichlorocinnamic acid, (E)-?

The CAS registry number of 2,4-Dichlorocinnamic acid, (E)- is 20595-45-3. Other or deprecated CAS numbers: 1201-99-6.

What is the molecular formula and weight of 2,4-Dichlorocinnamic acid, (E)-?

The molecular formula of 2,4-Dichlorocinnamic acid, (E)- is C9H6Cl2O2 and its molar mass is 217.05 g/mol.

What is 2,4-Dichlorocinnamic acid, (E)- used for?

Known uses and roles of 2,4-Dichlorocinnamic acid, (E)- include building blocks in research and laboratory and screening compounds in research and laboratory.

Is 2,4-Dichlorocinnamic acid, (E)- hazardous?

2,4-Dichlorocinnamic acid, (E)- carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 2,4-Dichlorocinnamic acid, (E)-?

2,4-Dichlorocinnamic acid, (E)- is usually classified under HS code 291639 (Aromatic monocarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 2,4-Dichlorocinnamic acid, (E)-?

CompoundList lists 2 suppliers of 2,4-Dichlorocinnamic acid, (E)- in China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of 2,4-Dichlorocinnamic acid, (E)-?

Suppliers quote 2,4-Dichlorocinnamic acid, (E)- 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 2,4-Dichlorocinnamic acid, (E)-

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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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