9-Undecynoic acid
9-Undecynoic acid (CAS: 22202-65-9), with the molecular formula C11H18O2 and a molecular weight of 182.26 g/mol, is a valuable organic building block. It features a terminal alkyne and a carboxylic acid functional group, making it versatile for various synthetic transformations. This compound serves as a key intermediate in organic synthesis, particularly in the development of complex molecules and functional materials.

Organic Synthesis
Serves as a versatile building block for constructing complex organic molecules. Its terminal alkyne and carboxylic acid functionalities allow for diverse coupling and derivatisation reactions.
Material Science
Can be incorporated into polymers or used to functionalise surfaces. The alkyne group is amenable to click chemistry, enabling the creation of novel materials with tailored properties.
Pharmaceutical Intermediates
Acts as a precursor in the synthesis of various pharmaceutical compounds. Its structure can be elaborated to create molecules with potential biological activity.
| Molecular weight | 182.26 |
|---|---|
| Empirical formula | C11H18O2 |
| Assay | 90% |
| Melting point | 56-60 °C |

Hazard statements
- 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 |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 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 9-Undecynoic acid used for?
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9-Undecynoic acid is primarily used as a building block in organic synthesis and in material science applications. It is also utilised as an intermediate in the development of pharmaceutical compounds.
What are the CAS number and molecular formula for 9-Undecynoic acid?
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The CAS number for 9-Undecynoic acid is 22202-65-9, and its molecular formula is C11H18O2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 9-Undecynoic acid with an assay of 90%. We do not represent this product as USP, BP, or EP grade.
What are the safety and handling precautions for 9-Undecynoic acid?
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9-Undecynoic acid is classified as a Warning (GHS07). It causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). Appropriate personal protective equipment, including a dust mask (type N95 US), eyeshields, and gloves, should be used. Ensure adequate ventilation.
Is 9-Undecynoic acid a controlled substance?
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The provided data does not indicate that 9-Undecynoic acid is a controlled substance.
How is 9-Undecynoic acid packed, shipped, and exported?
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As a global supplier, Tech Serve Solutions adheres to all international regulations for the safe packing, shipping, and export of chemical products like 9-Undecynoic acid.
How can I request a sample or a quote for 9-Undecynoic acid?
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To request a sample or a quote for 9-Undecynoic acid, please contact our sales department through the website or by phone.
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