4-Pentynoic acid
4-Pentynoic acid (CAS 6089-09-4), with the linear formula CH≡CCH₂CH₂COOH and a molecular weight of 98.10 g/mol, is an unsaturated carboxylic acid. This compound functions as a versatile building block in organic synthesis. Its applications span the creation of complex molecules, contributing to advancements in chemical research and the development of novel compounds.
- IUPAC
- Propargylacetic acid
- Synonyms
- Propargylacetic acid

Organic Synthesis
4-Pentynoic acid serves as a crucial intermediate in multi-step organic synthesis pathways. Its terminal alkyne and carboxylic acid functionalities allow for diverse chemical transformations.
Material Science
The molecule's structure, featuring both an alkyne and a carboxylic acid group, makes it suitable for incorporation into polymers or functional materials. It can be used in click chemistry reactions or for surface modification.
Pharmaceutical Research
As a building block, 4-Pentynoic acid can be utilised in the synthesis of potential drug candidates or their precursors. Its unique structure offers opportunities for creating novel molecular scaffolds.
| Molecular weight | 98.10 |
|---|---|
| Linear formula | CH≡CCH2CH2COOH |
| Assay | ≥97% (GC) |
| Grade | purum |
| Boiling point | 110 °C/30 mmHg(lit.) |
| Storage temperature | 2-8°C |
| Melting point | 54-57 °C(lit.)54-57 °C |

Hazard statements
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 3261 8 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | C |
| Risk statements (R) | 34 |
| Safety statements (S) | 26-36/37/39-45 |
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 4-Pentynoic acid used for?
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4-Pentynoic acid is primarily used as a building block in organic synthesis and in chemical research for creating complex molecules, including potential pharmaceutical intermediates and materials.
What is the CAS number and formula for 4-Pentynoic acid?
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The CAS number for 4-Pentynoic acid is 6089-09-4, and its linear formula is CH≡CCH₂CH₂COOH.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Pentynoic acid with a purity of ≥97% (GC), designated as 'purum' grade. We do not represent this product as USP, BP, or EP grade.
How should 4-Pentynoic acid be handled safely?
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4-Pentynoic acid is classified as Dangerous (GHS05, Danger) and causes severe skin burns and eye damage (H314). Appropriate personal protective equipment, including eyeshields, face shields, chemical-resistant gloves, and respiratory protection (type N100 or P3), must be worn. Handle in a well-ventilated area. Store at 2-8°C.
How is 4-Pentynoic acid packed and shipped?
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4-Pentynoic acid is shipped as a hazardous material, UN 3261, Class 8, Packing Group II. TSS ensures compliance with all export and shipping regulations for dangerous goods.
How can I request a quote or sample for 4-Pentynoic acid?
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To request a quote or sample of 4-Pentynoic acid, please use the contact form on our website or contact our sales team directly. Please reference the product name and CAS number.
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