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Monomers

Chloroacetaldehyde

Also known as 2-chloroacetaldehyde, Chloroethanal, 2-Chloroethanal

CAS 107-20-0Formula C2H3ClOMolar mass 78.50 g/molEC 203-472-8
GHS signal word: Danger. Pictograms: Corrosive, Acute toxicity (severe), Serious health hazard, Hazardous to the environment 14 suppliers listed
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Chloroacetaldehyde chemical structure, C2H3ClO, CAS 107-20-0
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless liquid [Note: Typically found as a 40% aqueous solution]
Melting point
-16.3 °C
Boiling point
85.5 °C
Density
1.19 g/cm³ at 25 °C
Flash point
87.7 °C
HS code
291300
Category
Monomers
UN number
UN 2232
Illustrative photo, 25 litre white jerry cans of liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Chloroacetaldehyde?

Plain description, key identifiers and synonyms

Chloroacetaldehyde is acetaldehyde substituted at C-2 by chlorine. It is functionally related to an acetaldehyde.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-chloroacetaldehyde
CAS number
107-20-0 CAS number cross-checked
EC number
203-472-8
Molecular formula
C2H3ClO
UNII
CF069F5D9C
MDL number
MFCD00006992
InChIKey
QSKPIOLLBIHNAC-UHFFFAOYSA-N
InChI
InChI=1S/C2H3ClO/c3-1-2-4/h2H,1H2
SMILES (canonical and isomeric)
C(C=O)Cl

Synonyms

  • 2-chloroacetaldehyde
  • Chloroethanal
  • 2-Chloroethanal
  • Monochloroacetaldehyde
  • Acetaldehyde, chloro-
  • Chloroaldehyde
  • 2-Chloro-1-ethanal
  • Chloroacetaldehyde monomer
  • RCRA waste number P023
  • Chloroacetaldehyde (40% aqueous solution)
  • Acetaldehyde, 2-chloro-
  • Chloroacetalaldehyde
  • CH2ClCHO
  • Chloroacetaldehyde (~45% in water)
  • alpha-chloroacetaldehyde
  • RCRA waste no. P023
  • chloracetaldehyde
  • chloroactaldehyde
  • chloroacetoaldehyde
  • chloro acetaldehyde
  • chloro-acetaldehyde
  • ClCH2CHO
  • 2-Chloro-Acetaldehyde
  • Chloroacetaldehyde (~45per cent in water)
  • 4-01-00-03134 (Beilstein Handbook Reference)
Show all 29 synonyms
  • Chloroacetaldehyde (40% aq.)
  • UN 2232
  • Chloro acetaldehyde, 45% in water
  • Chloroacetaldehyde, 45% w/w solution in water

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 liquid [Note: Typically found as a 40% aqueous solution]exp.
Odour
Acrid, penetrating odorexp.
Melting point
-16.3 °Cexp.
Boiling point
85.5 °Cexp.
Density
1.19 g/cm³ at 25 °Cexp.
Flash point
87.7 °Cexp.
Autoignition temperature
88 °Cexp.
Solubility
Miscible in all proportions with waterexp.
Vapour pressure
Vapor pressure, kPa at 20 °C: 13.3exp.

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
78.50 g/molcalc.
Exact mass
77.9872 Dacalc.
LogP (octanol/water)
0.42calc.
Topological polar surface area
17.07 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
1calc.
Heavy atoms
4calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.5calc.
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
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H301Toxic if swallowed.
  • H311Toxic in contact with skin.
  • H314Causes severe skin burns and eye damage.
  • H330Fatal if inhaled.
  • H351Suspected of causing cancer.
  • H400Very toxic to aquatic life.
Precautionary statements (26)
  • P203Obtain, read and follow all safety instructions before use.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • 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.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P352If on skin: Wash with plenty of water.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P318If exposed or concerned, get medical advice.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P363Wash contaminated clothing before reuse.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2232
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

Chloroacetaldehyde suppliers

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

All 14 suppliers
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Where suppliers are based

14 suppliers in 4 countries

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Chloroacetaldehyde 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

In manufacture of 2-aminothiazole, to facilitate bark removal from tree trunks.

Intermediate, fungicide.

Used as a spinning solution of poly B-alanine.

Manufacture of pharmaceuticals, e.g., as starting material to synthesize statine intermediates. The mercapto derivative of chloroacetaldehyde, 2,5-dihydroxy-1,4-dithiane, is an important building block for drugs against AIDS. ... Raw material to make dyestuffs. Dialkylacetal derivatives of chloroacetaldehyde such as chloroacetaldehyde dimethyl acetal are important starting materials for the manufacture of agrochemicals. The acetals are also used to make fragrances.

Industries and functions

How it is made

Simultaneous introduction of vinyl chloride and chlorine into water at ca. 20 °C forms chloroacetaldehyde in a nearly quantitative yield if its concentration in the reaction solution is not allowed to rise above ca. 5 wt %. At a higher concentration, increasing amounts of 1,1,2-trichloroethane are formed. This method yields only a dilute solution of chloroacetaldehyde. Concentrated aqueous solutions of chloroacetaldehyde are obtained in nearly quantitative yields by the reaction of chlorine with vinyl acetate in water at room temperature.

Read more

As an intermediate 1,2-dichloroethyl acetate is formed, which is quantitatively hydrolyzed at elevated temperatures. The resulting solution is purified by distillation.

Monochloroacetaldehyde is also obtained in high yield by pyrolysis of chloroethylene carbonate in the presence of quaternary ammonium salts.

Direct chlorination of dry acetaldehyde or paraldehyde gives only a low yield of monochloroacetaldehyde. Azeotropic dehydration of the hemihydrate with chloroform, toluene, or carbon tetrachloride followed by distillation over anhydrous calcium chloride gives better yields.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 605-025-00-6

Health and food

  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Chloroacetaldehyde, Ref no: 998, Annex ref: II/998

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2913.00Indicative HS code

Halogenated, sulphonated, nitrated or nitrosated derivatives of products of heading 2912

World exports in 2024
$53.8M
−28.4% vs 2023, imports $62M
2019 to 2024
Top exporters
  1. China62.0%
  2. India * partner reported22.7%
  3. Japan6.6%
Top importers
  1. India * partner reported37.9%
  2. Japan9.9%
  3. Germany7.6%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Chloroacetaldehyde?

Chloroacetaldehyde is acetaldehyde substituted at C-2 by chlorine. It is functionally related to an acetaldehyde.

What is the CAS number of Chloroacetaldehyde?

The CAS registry number of Chloroacetaldehyde is 107-20-0.

What is the molecular formula and weight of Chloroacetaldehyde?

The molecular formula of Chloroacetaldehyde is C2H3ClO and its molar mass is 78.50 g/mol.

What is Chloroacetaldehyde used for?

In manufacture of 2-aminothiazole, to facilitate bark removal from tree trunks. Intermediate, fungicide. Used as a spinning solution of poly B-alanine. Manufacture of pharmaceuticals, e.g., as starting material to synthesize statine intermediates.

Is Chloroacetaldehyde hazardous?

Chloroacetaldehyde carries the GHS signal word "Danger". Main hazards: toxic if swallowed, toxic in contact with skin, causes severe skin burns and eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Chloroacetaldehyde?

Chloroacetaldehyde is usually classified under HS code 291300 (Halogenated, sulphonated, nitrated or nitrosated derivatives of products of heading 2912). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Chloroacetaldehyde?

CompoundList lists 14 suppliers of Chloroacetaldehyde in China, United States, India and United Kingdom. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Chloroacetaldehyde in India?

2 suppliers in India list Chloroacetaldehyde on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Chloroacetaldehyde?

Suppliers quote Chloroacetaldehyde 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 Chloroacetaldehyde

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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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