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Carboxylic acids and anhydrides

Propiolic acid

Also known as 2-Propynoic acid, Propargylic acid, prop-2-ynoic acid

CAS 471-25-0Formula C3H2O2Molar mass 70.05 g/molEC 207-437-8
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Acute toxicity (severe) 19 suppliers listed
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Propiolic acid chemical structure, C3H2O2, CAS 471-25-0
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Crystals from carbon disulfde
Melting point
18 °C
Boiling point
144 °C
Density
1.1380 g/cm³ at 20 °C
Flash point
58 °C
HS code
291619
Category
Carboxylic acids and anhydrides
Illustrative photo, drums, an IBC tote and sacks in a chemical warehouse in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Propiolic acid?

Plain description, key identifiers and synonyms

Propynoic acid is a terminal acetylenic compound that is a 3-carbon, straight-chain, monounsaturated fatty acid having one acetylenic bond. It has a role as a xenobiotic metabolite. It is an acetylenic fatty acid, a monounsaturated fatty acid, a short-chain fatty acid, a terminal acetylenic compound and an alpha,beta-unsaturated monocarboxylic acid. It is a conjugate acid of a propynoate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
prop-2-ynoic acid
CAS number
471-25-0 CAS number cross-checkedOther or deprecated CAS: 26969-44-8
EC number
207-437-8
Molecular formula
C3H2O2
UNII
P2QW39G9LZ
MDL number
MFCD00004360
InChIKey
UORVCLMRJXCDCP-UHFFFAOYSA-N
InChI
InChI=1S/C3H2O2/c1-2-3(4)5/h1H,(H,4,5)
SMILES (canonical and isomeric)
C#CC(=O)O

Synonyms

  • 2-Propynoic acid
  • Propargylic acid
  • prop-2-ynoic acid
  • Propynoic acid
  • Acetylenecarboxylic acid
  • Carboxyacetylene
  • Carboxy acetylene
  • Propiolic acidd
  • Propinsaeure
  • Propiolsaeure
  • propinic acid
  • HC#CCOOH
  • Acetylenemonocarboxylate
  • propiolate
  • Acetylene carboxylic acid
  • HC.equiv.CCOOH
  • Propiolic acid, 95%
  • HC.$.CCOOH
  • acetylenemonocarboxylic acid
  • 2-Propyne-1-carboxylic acid
  • Propiolic acid, technical, >=95% (T)

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
Crystals from carbon disulfdeexp.
Odour
Odor resembling acetic acidexp.
Melting point
18 °Cexp.
Boiling point
144 °Cexp.
Density
1.1380 g/cm³ at 20 °Cexp.
Flash point
58 °Cexp.
Solubility
Very soluble in water, ether, ethanol, chloroformexp.

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
70.05 g/molcalc.
Exact mass
70.0055 Dacalc.
LogP (octanol/water)
-0.3calc.
Topological polar surface area
37.3 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
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.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)

Hazard statements

  • H226Flammable liquid and vapour.
  • H301Toxic if swallowed.
  • H310Fatal in contact with skin.
  • H314Causes severe skin burns and eye damage.
Precautionary statements (27)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • 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.
  • P280Wear protective gloves, protective clothing, eye protection and face 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.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • 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.
  • 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.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • 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

Propiolic acid suppliers

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

All 19 suppliers
19 of 19 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

19 suppliers in 6 countries

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Propiolic acid 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

Laboratory reagent ... synthesis of transition metal complexes, haloalkyl propiolates, and halopropenoates.

Used in agriculture and in the control of nematodes (non-US).

Roles

  • metabolite
  • xenobiotic metabolite

How it is made

Propiolic acid, acetylenecarboxylic acid, is produced electrochemically from propargyl alcohol ...

Regulatory status

Inventories, regulations and trade controls that list this substance

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 Propiolic acid is traded under.

HS 2916.19Indicative HS code

Unsaturated acyclic monocarboxylic acids, their anhydrides, halides, peroxides…

World exports in 2024
$674M
−9.6% vs 2023, imports $722M
2019 to 2024
Top exporters
  1. China44.5%
  2. Germany15.3%
  3. India * partner reported11.5%
Top importers
  1. United States17.1%
  2. Netherlands7.8%
  3. South Korea7.0%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Propiolic acid, based on the data on this page

What is Propiolic acid?

Propynoic acid is a terminal acetylenic compound that is a 3-carbon, straight-chain, monounsaturated fatty acid having one acetylenic bond. It has a role as a xenobiotic metabolite.

What is the CAS number of Propiolic acid?

The CAS registry number of Propiolic acid is 471-25-0. Other or deprecated CAS numbers: 26969-44-8.

What is the molecular formula and weight of Propiolic acid?

The molecular formula of Propiolic acid is C3H2O2 and its molar mass is 70.05 g/mol.

What is Propiolic acid used for?

Laboratory reagent ... synthesis of transition metal complexes, haloalkyl propiolates, and halopropenoates. Used in agriculture and in the control of nematodes (non-US).

Is Propiolic acid hazardous?

Propiolic acid carries the GHS signal word "Danger". Main hazards: flammable liquid and vapour, toxic if swallowed, fatal in contact with skin. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Propiolic acid?

Propiolic acid is usually classified under HS code 291619 (Unsaturated acyclic monocarboxylic acids, their anhydrides, halides, peroxides…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Propiolic acid?

CompoundList lists 19 suppliers of Propiolic acid in China, United States, Canada, India and 2 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Propiolic acid in India?

1 supplier in India list Propiolic acid on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Propiolic acid?

Suppliers quote Propiolic acid 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 Propiolic acid

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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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