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Carboxylic acids and anhydrides

2-Pentynoic acid

Also known as pent-2-ynoic acid, Pentynoic acid, pent-2-ynoicacid

CAS 5963-77-9Formula C5H6O2Molar mass 98.10 g/molEC 626-205-0
GHS signal word: Warning. Pictograms: Harmful or irritant 2 suppliers listed
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2-Pentynoic acid chemical structure, C5H6O2, CAS 5963-77-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
5963-77-9
Formula
C5H6O2
Molar mass
98.10 g/mol
EC number
626-205-0
HS code
291619
Category
Carboxylic acids and anhydrides

What is 2-Pentynoic acid?

Plain description, key identifiers and synonyms

2-Pentynoic acid is a chemical substance with the molecular formula C5H6O2 and a molar mass of 98.10 g/mol. Its CAS registry number is 5963-77-9. The IUPAC name is pent-2-ynoic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
pent-2-ynoic acid
CAS number
5963-77-9 CAS number cross-checked
EC number
626-205-0
Molecular formula
C5H6O2
MDL number
MFCD00014370
InChIKey
MINRDQDGBLQBGD-UHFFFAOYSA-N
InChI
InChI=1S/C5H6O2/c1-2-3-4-5(6)7/h2H2,1H3,(H,6,7)
SMILES (canonical and isomeric)
CCC#CC(=O)O

Synonyms

  • pent-2-ynoic acid
  • Pentynoic acid
  • pent-2-ynoicacid
  • 2-Pentynoic acid, 97%
  • 2-Pentynoicacid

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
98.10 g/molcalc.
Exact mass
98.0368 Dacalc.
LogP (octanol/water)
0.48calc.
Topological polar surface area
37.3 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
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
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H302Harmful if swallowed.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (19)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • 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).
  • P330Rinse mouth.
  • 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-Pentynoic acid suppliers

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

All 2 suppliers

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

2 suppliers in 2 countries

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2-Pentynoic acid price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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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-Pentynoic 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 2-Pentynoic acid is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 2-Pentynoic acid, based on the data on this page

What is 2-Pentynoic acid?

2-Pentynoic acid is a chemical substance with the molecular formula C5H6O2 and a molar mass of 98.10 g/mol. Its CAS registry number is 5963-77-9. The IUPAC name is pent-2-ynoic acid.

What is the CAS number of 2-Pentynoic acid?

The CAS registry number of 2-Pentynoic acid is 5963-77-9.

What is the molecular formula and weight of 2-Pentynoic acid?

The molecular formula of 2-Pentynoic acid is C5H6O2 and its molar mass is 98.10 g/mol.

What is 2-Pentynoic acid used for?

Known uses and roles of 2-Pentynoic acid include building blocks in research and laboratory.

Is 2-Pentynoic acid hazardous?

2-Pentynoic acid carries the GHS signal word "Warning". Main hazards: harmful if swallowed, 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 2-Pentynoic acid?

2-Pentynoic 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 2-Pentynoic acid?

CompoundList lists 2 suppliers of 2-Pentynoic acid in China and United States. 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-Pentynoic acid?

Suppliers quote 2-Pentynoic 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 2-Pentynoic 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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