5-Phenylisoxazole-4-carboxylic acid
5-Phenylisoxazole-4-carboxylic acid (CAS: 76344-95-1), with the molecular formula C10H7NO3 and a molecular weight of 189.17 g/mol, is a heterocyclic organic compound. It functions as a key building block in chemical synthesis. Its utility lies in its heterocyclic structure, making it valuable for constructing more complex molecules, particularly within pharmaceutical research and development and materials science.

Pharmaceutical Intermediate
Utilised as a precursor in the synthesis of active pharmaceutical ingredients (APIs) and drug candidates, leveraging its isoxazole core for targeted molecular design.
Organic Synthesis Building Block
Serves as a versatile intermediate for creating novel organic compounds, heterocycles, and complex molecular architectures.
Research and Development
Employed in academic and industrial laboratories for exploring new chemical reactions and developing innovative materials and therapeutic agents.
| Molecular weight | 189.17 |
|---|---|
| Empirical formula | C10H7NO3 |
| Assay | 97% |
| Melting point | 151-155 °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) | 26-36 |
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-Phenylisoxazole-4-carboxylic acid used for?
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5-Phenylisoxazole-4-carboxylic acid is primarily used as a building block in organic synthesis and as an intermediate in the development of pharmaceuticals and novel materials.
What is the CAS number and formula for 5-Phenylisoxazole-4-carboxylic acid?
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The CAS number is 76344-95-1 and the molecular formula is C10H7NO3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 5-Phenylisoxazole-4-carboxylic acid with a minimum assay of 97%. We do not represent this product as USP, BP, or EP grade.
What are the safety and handling requirements for this chemical?
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This compound is a Warning substance (GHS07) and is classified with hazards H315 (causes skin irritation), H319 (causes serious eye irritation), and H335 (may cause respiratory irritation). Appropriate personal protective equipment includes a dust mask type N95 (US), eyeshields, and gloves. Ensure adequate ventilation.
How is 5-Phenylisoxazole-4-carboxylic acid packed and shipped?
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5-Phenylisoxazole-4-carboxylic acid is carefully packed to ensure stability during transit and is available for export globally by Tech Serve Solutions.
How can I request a quote or sample?
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To request a quote or a sample of 5-Phenylisoxazole-4-carboxylic acid, please use the contact form on our website or contact our sales team directly.
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