3-Thiopheneacetic acid
3-Thiopheneacetic acid (CAS: 6964-21-2, Formula: C6H6O2S) is a valuable heterocyclic building block with a molecular weight of 142.18 g/mol. Characterised by its thiophene ring and acetic acid moiety, it serves as a key intermediate in organic synthesis. Its utility spans various chemical research and development sectors, particularly in the construction of more complex molecules.
- IUPAC
- 3-Thienylacetic acid

Organic Synthesis Intermediate
Utilised as a building block in the synthesis of diverse organic compounds. Its reactive functional groups allow for a range of chemical transformations, making it useful for creating novel molecular structures in research and development.
Pharmaceutical Research
Serves as a precursor or intermediate in the development of potential pharmaceutical agents. The thiophene scaffold is present in many biologically active molecules, and this acid can be incorporated into drug discovery programmes.
Materials Science
May be employed in the synthesis of specialised polymers or functional materials. Thiophene derivatives are known for their electronic properties, suggesting potential applications in this field.
| Molecular weight | 142.18 |
|---|---|
| Empirical formula | C6H6O2S |
| Assay | 98% |
| Melting point | 73-76 °C(lit.) |

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 |
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 3-Thiopheneacetic acid used for?
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3-Thiopheneacetic acid is primarily used as a building block and intermediate in organic synthesis, particularly in pharmaceutical research and potentially in materials science due to its heterocyclic structure.
What are the CAS number and formula for 3-Thiopheneacetic acid?
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The CAS number for 3-Thiopheneacetic acid is 6964-21-2, and its molecular formula is C6H6O2S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-Thiopheneacetic acid with a minimum assay of 98%. We do not represent this product as meeting any pharmacopoeia standards (USP, EP, BP) unless explicitly stated in the product documentation.
How should 3-Thiopheneacetic acid be handled safely?
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3-Thiopheneacetic acid is classified as a Warning substance (GHS07) and can cause skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Appropriate personal protective equipment, including eyeshields, gloves, and a dust mask (type N95 or equivalent), should be used. Handle in a well-ventilated area or fume hood.
Is 3-Thiopheneacetic acid a controlled substance?
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Based on the provided data, there is no indication that 3-Thiopheneacetic acid is a controlled substance.
How is 3-Thiopheneacetic acid packed, shipped, and exported?
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Tech Serve Solutions expertly packs, ships, and exports fine chemicals globally, adhering to all relevant regulations for safe and secure transport.
How can I request a quote or sample for 3-Thiopheneacetic acid?
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To request a quote or a sample of 3-Thiopheneacetic acid, please contact our sales team through the website or via email, providing your specific requirements.
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