5-Chlorothiophene-2-carboxylic acid
5-Chlorothiophene-2-carboxylic acid (CAS: 24065-33-6; Formula: C5H3ClO2S; Molar Mass: 162.59 g/mol) is a halogenated heterocyclic compound. This thiophene derivative serves as a versatile building block in organic synthesis. Its structure allows for various chemical modifications, making it valuable in the development of novel compounds, particularly within the pharmaceutical and agrochemical sectors. Available at 97% purity, it is suitable for research and development applications.

Organic Synthesis Intermediate
Utilised as a key intermediate in the synthesis of more complex organic molecules. Its carboxylic acid and chlorine functional groups offer reactive sites for diverse chemical transformations.
Pharmaceutical Research
A valuable building block for the development of active pharmaceutical ingredients (APIs). Its heterocyclic nature is common in many drug scaffolds.
Agrochemical Development
Employed in the research and synthesis of novel agrochemicals. The thiophene core and halogen substituent can impart specific biological activities.
Material Science
Potentially used in the synthesis of functional materials where halogenated thiophene units are incorporated to modify electronic or physical properties.
| Molecular weight | 162.59 |
|---|---|
| Empirical formula | C5H3ClO2S |
| Assay | 97% |
| Melting point | 154-158 °C(lit.) |

Hazard statements
- H317May cause an allergic skin reaction
- H319Causes serious eye irritation
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Faceshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36-43 |
| 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 5-Chlorothiophene-2-carboxylic acid used for?
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5-Chlorothiophene-2-carboxylic acid is primarily used as a building block in organic synthesis, particularly in the development of pharmaceuticals and agrochemicals.
What are the CAS number and formula for 5-Chlorothiophene-2-carboxylic acid?
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The CAS number is 24065-33-6 and the empirical formula is C5H3ClO2S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 5-Chlorothiophene-2-carboxylic acid with an assay of 97%. We do not represent this product as USP, BP, or EP grade; it is suitable for research and technical applications.
How should 5-Chlorothiophene-2-carboxylic acid be handled safely?
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Handle with appropriate personal protective equipment, including a dust mask (N95 or equivalent), eyeshields, faceshields, and gloves. Avoid contact with skin and eyes, and avoid breathing dust. Ensure good ventilation. Refer to the Safety Data Sheet for comprehensive handling information.
Can Tech Serve Solutions export 5-Chlorothiophene-2-carboxylic acid?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 5-Chlorothiophene-2-carboxylic acid.
How can I request a sample or quote for 5-Chlorothiophene-2-carboxylic acid?
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To request a sample or quote, please contact our sales team through the website or by phone, providing the product name and CAS number (24065-33-6).
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