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Esters and lactones

Ethyl propiolate

Also known as ethyl prop-2-ynoate, Ethyl acetylenecarboxylate, Ethyl propynoate

CAS 623-47-2Formula C5H6O2Molar mass 98.10 g/molEC 210-795-8
GHS signal word: Warning. Pictograms: Flammable, Harmful or irritant 20 suppliers listed
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Ethyl propiolate chemical structure, C5H6O2, CAS 623-47-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
623-47-2
Formula
C5H6O2
Molar mass
98.10 g/mol
Physical form
Liquid
HS code
291619
Category
Esters and lactones
Illustrative photo, assorted laboratory chemical bottles and jars on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Ethyl propiolate?

Plain description, key identifiers and synonyms

Ethyl propiolate is the ethyl ester of prop-2-ynoic acid. It is an ethyl ester, a ynoate ester and a terminal acetylenic compound.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
ethyl prop-2-ynoate
CAS number
623-47-2 CAS number cross-checkedOther or deprecated CAS: 31762-50-2, 823-47-2
EC number
210-795-8
Molecular formula
C5H6O2
UNII
W235G5U52S
MDL number
MFCD00009184
InChIKey
FMVJYQGSRWVMQV-UHFFFAOYSA-N
InChI
InChI=1S/C5H6O2/c1-3-5(6)7-4-2/h1H,4H2,2H3
SMILES (canonical and isomeric)
CCOC(=O)C#C

Synonyms

  • ethyl prop-2-ynoate
  • Ethyl acetylenecarboxylate
  • Ethyl propynoate
  • (Ethoxycarbonyl)acetylene
  • 2-Propynoic acid, ethyl ester
  • Ethyl 2-propynoate
  • Propiolic acid ethyl ester
  • ethyl propargylate
  • Propargylic Acid Ethyl Ester
  • Propiolic acid, ethyl ester
  • Propynoic Acid Ethyl Ester
  • 2-propynoic acid ethyl ester
  • ethyl propioloate
  • ethyl propio late
  • ethyl propio-late
  • ethyl-2-propynate
  • Ethyl propiolate, 99%
  • prop-2-ynoic acid ethyl ester
  • Ethyl acetylenemonocarboxylate

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

Physical form
Liquidexp.

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
98.10 g/molcalc.
Exact mass
98.0368 Dacalc.
LogP (octanol/water)
0.18calc.
Topological polar surface area
26.3 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
1calc.
Heavy atoms
7calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.4calc.
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
Warning
GHS02: Flammable
Flammable
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H226Flammable liquid and vapour.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (25)
  • 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.
  • 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.
  • 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 + 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.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • 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

Ethyl propiolate suppliers

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

All 20 suppliers
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Where suppliers are based

20 suppliers in 8 countries

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Ethyl propiolate 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

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 Ethyl propiolate 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 Ethyl propiolate is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Ethyl propiolate, based on the data on this page

What is Ethyl propiolate?

Ethyl propiolate is the ethyl ester of prop-2-ynoic acid. It is an ethyl ester, a ynoate ester and a terminal acetylenic compound.

What is the CAS number of Ethyl propiolate?

The CAS registry number of Ethyl propiolate is 623-47-2. Other or deprecated CAS numbers: 31762-50-2, 823-47-2.

What is the molecular formula and weight of Ethyl propiolate?

The molecular formula of Ethyl propiolate is C5H6O2 and its molar mass is 98.10 g/mol.

What is Ethyl propiolate used for?

Known uses and roles of Ethyl propiolate include building blocks in research and laboratory.

Is Ethyl propiolate hazardous?

Ethyl propiolate carries the GHS signal word "Warning". Main hazards: flammable liquid and vapour, causes skin irritation, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Ethyl propiolate?

Ethyl propiolate 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 Ethyl propiolate?

CompoundList lists 20 suppliers of Ethyl propiolate in China, United States, Canada, Germany and 4 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Ethyl propiolate in India?

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

What is the price of Ethyl propiolate?

Suppliers quote Ethyl propiolate 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 Ethyl propiolate

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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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