5-(2-Thienyl)pyrazole
5-(2-Thienyl)pyrazole (CAS: 219863-71-5), with the molecular formula C7H6N2S and a molecular weight of 150.20 g/mol, is a heterocyclic organic compound. It serves as a valuable building block in chemical synthesis, particularly within the realm of heterocyclic chemistry. This compound features a pyrazole ring substituted with a thienyl group, making it a useful intermediate for developing more complex molecular structures in research and development.
- IUPAC
- 5-(2-Thienyl)-1H-pyrazole

Organic Synthesis Intermediate
5-(2-Thienyl)pyrazole is employed as a key intermediate in the synthesis of novel organic molecules. Its structure allows for various derivatizations, facilitating the creation of complex heterocyclic systems.
Research and Development
This compound finds application in academic and industrial research laboratories for exploring new chemical entities. It is particularly useful in medicinal chemistry and materials science exploration.
Heterocyclic Chemistry
As a substituted pyrazole and a thiophene derivative, it is a useful scaffold for chemists working on developing new heterocyclic compounds with specific electronic or biological properties.
| Molecular weight | 150.20 |
|---|---|
| Empirical formula | C7H6N2S |
| Melting point | 97-102 °C |

Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Water hazard class (WGK, DE) | 3 |
|---|---|
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-36/37/38 |
| 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 5-(2-Thienyl)pyrazole used for?
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5-(2-Thienyl)pyrazole is primarily used as a building block and intermediate in organic synthesis and chemical research, particularly within heterocyclic chemistry.
What are the CAS number and molecular formula for 5-(2-Thienyl)pyrazole?
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The CAS number is 219863-71-5, and the molecular formula is C7H6N2S.
What grade and purity does Tech Serve Solutions supply for 5-(2-Thienyl)pyrazole?
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Tech Serve Solutions supplies 5-(2-Thienyl)pyrazole typically as a research or technical grade material. Specific purity assays are available on the Certificate of Analysis. We do not represent this product as USP, BP, or EP grade.
How should 5-(2-Thienyl)pyrazole be handled safely?
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5-(2-Thienyl)pyrazole is classified with GHS07 symbol and a Warning signal word. It is harmful if swallowed (H302), causes skin irritation (H315), causes serious eye irritation (H319), and may cause respiratory irritation (H335). Handle with appropriate personal protective equipment in a well-ventilated area, avoiding dust formation and contact with skin, eyes, and clothing. Refer to the Safety Data Sheet for comprehensive safety information.
Is 5-(2-Thienyl)pyrazole available for export?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 5-(2-Thienyl)pyrazole. Please contact us to discuss your international requirements.
How can I request a sample or quote for 5-(2-Thienyl)pyrazole?
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To request a sample or a quote for 5-(2-Thienyl)pyrazole, please use the 'Request Sample' or 'Request Quote' button on our product page, or contact our sales team directly with your inquiry.
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