3-Chloro-benzo[b]thiophene-2-carboxylic acid
3-Chloro-benzo[b]thiophene-2-carboxylic acid (CAS: 21211-22-3; Formula: C9H5ClO2S; Molar Mass: 212.65 g/mol) is a halogenated heterocyclic organic compound. It serves as a valuable building block in chemical synthesis. This benzothiophene derivative is primarily utilised in research and development settings for the creation of novel molecules and complex organic structures, particularly within the pharmaceutical and material science industries.
![3-Chloro-benzo[b]thiophene-2-carboxylic acid (C9H5ClO2S) — chemical structure, CAS 21211-22-3; Chemistry, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F21211-22-3.png&w=3840&q=75)
Organic Synthesis Intermediate
This compound is frequently employed as an intermediate in the synthesis of more complex organic molecules. Its reactive functional groups allow for diverse chemical transformations.
Research and Development
Utilised in academic and industrial research labs for exploring new chemical pathways and developing novel compounds with potential biological or material properties.
Building Block for Heterocycles
Serves as a key structural component for the construction of various benzothiophene-based heterocycles, important in medicinal chemistry.
| Molecular weight | 212.65 |
|---|---|
| Empirical formula | C9H5ClO2S |
| Assay | 97% |
| Melting point | 268-272 °C(lit.) |

Hazard statements
- H302Harmful if swallowed
- H319Causes serious eye irritation
Precautionary statements
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22 |
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-Chloro-benzo[b]thiophene-2-carboxylic acid used for?
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3-Chloro-benzo[b]thiophene-2-carboxylic acid is primarily used as an intermediate and building block in organic synthesis and research and development for creating novel organic molecules and complex structures.
What are the CAS number and formula for 3-Chloro-benzo[b]thiophene-2-carboxylic acid?
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The CAS number is 21211-22-3 and the empirical formula (Hill notation) is C9H5ClO2S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-Chloro-benzo[b]thiophene-2-carboxylic acid with an assay of 97%. This product is supplied for research and development use and TSS does not represent it as USP, BP, EP, or other pharmacopoeial grades.
How should 3-Chloro-benzo[b]thiophene-2-carboxylic acid be handled?
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This compound is classified with a Warning signal word and carries hazard statements H302 (Harmful if swallowed) and H319 (Causes serious eye irritation). When handling, use a dust mask type N95 (US), wear eyeshields, and gloves. Ensure proper ventilation and follow P305 + P351 + P338 (IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing) procedures.
Is this chemical a controlled substance?
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Based on the provided data, there is no indication that 3-Chloro-benzo[b]thiophene-2-carboxylic acid is a scheduled or controlled substance.
How is 3-Chloro-benzo[b]thiophene-2-carboxylic acid shipped?
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Tech Serve Solutions, as a specialist global supplier and exporter, handles the packing, shipping, and export of chemicals like 3-Chloro-benzo[b]thiophene-2-carboxylic acid according to international regulations.
How can I request a quote or sample?
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To request a quote or a sample of 3-Chloro-benzo[b]thiophene-2-carboxylic acid, please contact our sales department through the website or by phone, providing your specific requirements.
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