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Carboxylic acids and anhydrides

5-Hexynoic acid

Also known as hex-5-ynoic acid, 5-Hexyn-1-oic acid, 4-Ethynylbutyric acid

CAS 53293-00-8Formula C6H8O2Molar mass 112.13 g/molEC 610-982-8
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant 14 suppliers listed
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5-Hexynoic acid chemical structure, C6H8O2, CAS 53293-00-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
53293-00-8
Formula
C6H8O2
Molar mass
112.13 g/mol
EC number
610-982-8
HS code
291619
Category
Carboxylic acids and anhydrides

What is 5-Hexynoic acid?

Plain description, key identifiers and synonyms

Hex-5-ynoic acid is a hexynoic acid in which the triple bond is between the carbons at positions 5 and 6. It is a hexynoic acid and a terminal acetylenic compound.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
hex-5-ynoic acid
CAS number
53293-00-8 CAS number cross-checked
EC number
610-982-8
Molecular formula
C6H8O2
MDL number
MFCD00066346
InChIKey
VPFMEXRVUOPYRG-UHFFFAOYSA-N
InChI
InChI=1S/C6H8O2/c1-2-3-4-5-6(7)8/h1H,3-5H2,(H,7,8)
SMILES (canonical and isomeric)
C#CCCCC(=O)O

Synonyms

  • hex-5-ynoic acid
  • 5-Hexyn-1-oic acid
  • 4-Ethynylbutyric acid
  • 5-Hexynoicacid
  • 5-Hexynoic acid, 97%
  • 4-Ethynylbutyric Acid, 5-Hexyn-1-oic Acid,
  • LCWG003
  • 5-Ethyl-N-m
  • 5-Hexynoic acid, 5-Hexyn-1-oic 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
112.13 g/molcalc.
Exact mass
112.0524 Dacalc.
LogP (octanol/water)
0.87calc.
Topological polar surface area
37.3 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
3calc.
Heavy atoms
8calc.
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
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H314Causes severe skin burns and eye damage.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (22)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • 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.
  • 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 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • 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.
  • 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.
  • P363Wash contaminated clothing 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

5-Hexynoic acid suppliers

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

All 14 suppliers
14 of 14 offers

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Where suppliers are based

14 suppliers in 3 countries

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5-Hexynoic 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

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 5-Hexynoic 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 5-Hexynoic acid is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 5-Hexynoic acid, based on the data on this page

What is 5-Hexynoic acid?

Hex-5-ynoic acid is a hexynoic acid in which the triple bond is between the carbons at positions 5 and 6. It is a hexynoic acid and a terminal acetylenic compound.

What is the CAS number of 5-Hexynoic acid?

The CAS registry number of 5-Hexynoic acid is 53293-00-8.

What is the molecular formula and weight of 5-Hexynoic acid?

The molecular formula of 5-Hexynoic acid is C6H8O2 and its molar mass is 112.13 g/mol.

What is 5-Hexynoic acid used for?

Known uses and roles of 5-Hexynoic acid include building blocks in research and laboratory.

Is 5-Hexynoic acid hazardous?

5-Hexynoic acid carries the GHS signal word "Danger". Main hazards: causes severe skin burns and eye damage, 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 5-Hexynoic acid?

5-Hexynoic 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 5-Hexynoic acid?

CompoundList lists 14 suppliers of 5-Hexynoic acid in United States, China and Germany. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of 5-Hexynoic acid?

Suppliers quote 5-Hexynoic 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 5-Hexynoic 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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