2-Pentynoic acid
2-Pentynoic acid (CAS 5963-77-9), with the chemical formula CH3CH2CH≡CCO2H and a molecular weight of 98.10 g/mol, is a valuable organic building block. This carboxylic acid features an internal alkyne functionality, making it useful in various chemical synthesis pathways. It is typically supplied at a purity of 97% for research and development purposes.

Organic Synthesis Intermediate
2-Pentynoic acid serves as a versatile intermediate in the synthesis of more complex organic molecules. Its alkyne and carboxylic acid groups allow for diverse chemical transformations.
Research and Development
Utilised in laboratories for exploring new chemical reactions and developing novel compounds. Its specific structure lends itself to studies in medicinal chemistry and materials science.
Building Block for Heterocycles
The alkyne moiety can participate in cyclisation reactions, making it a useful starting material for constructing heterocyclic compounds with potential biological activity.
| Molecular weight | 98.10 |
|---|---|
| Linear formula | CH3CH2CH≡CCO2H |
| Assay | 97% |
| Melting point | 47-53 °C |

Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Flash point | 96 °C / 204.8 °F |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 2-Pentynoic acid primarily used for?
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2-Pentynoic acid is primarily used as an intermediate in organic synthesis and as a building block in research and development for creating novel organic compounds and exploring chemical reactions.
What is the CAS number and chemical formula for 2-Pentynoic acid?
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The CAS number for 2-Pentynoic acid is 5963-77-9, and its chemical formula is CH3CH2CH≡CCO2H.
What grade and purity does Tech Serve Solutions supply for 2-Pentynoic acid?
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Tech Serve Solutions supplies 2-Pentynoic acid with an assay of 97%. TSS does not represent this product as USP, BP, or EP grade.
How should 2-Pentynoic acid be handled safely?
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2-Pentynoic acid is a Warning substance that causes skin irritation, serious eye irritation, and respiratory irritation (H315-H319-H335) and is harmful if swallowed (H302). Handle with appropriate personal protective equipment, including a dust mask type N95 (US), eyeshields, and gloves. Ensure adequate ventilation.
Is 2-Pentynoic acid available for international export?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, including 2-Pentynoic acid.
How can I request a sample or quote for 2-Pentynoic acid?
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To request a sample or quote for 2-Pentynoic acid, please contact our sales team through the website or by phone.
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