5-Methylisoxazole-3-carboxaldehyde
5-Methylisoxazole-3-carboxaldehyde (CAS 62254-74-4) is a heterocyclic aldehyde with the molecular formula C5H5NO2 and a molecular weight of 111.10 g/mol. It serves as a valuable building block in organic synthesis, particularly for the preparation of more complex molecules. Its isoxazole core and reactive aldehyde functionality make it a versatile intermediate in the development of pharmaceuticals and fine chemicals. This compound is typically supplied at a 95% assay.

Pharmaceutical Intermediate
Used in the synthesis of active pharmaceutical ingredients (APIs) and drug candidates. The isoxazole ring system is a common motif in many biologically active compounds.
Organic Building Block
Serves as a versatile reagent in multi-step organic syntheses. Its aldehyde group can undergo various reactions, including nucleophilic additions and oxidations/reductions.
Agrochemical Research
Potential applications in the development of novel pesticides and herbicides due to its heterocyclic structure.
Materials Science
Can be incorporated into functional materials or polymers where the isoxazole moiety imparts specific properties.
| Molecular weight | 111.10 |
|---|---|
| Empirical formula | C5H5NO2 |
| Assay | 95% |
| Melting point | 30-34 °C(lit.) |


Hazard statements
- H228Flammable solid
- H302Harmful if swallowed
Precautionary statements
- P210Keep away from heat, sparks and open flames. No smoking
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Flash point | 56 °C / 132.8 °F |
| Transport (UN / ADR) | UN 1325 4.1 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | F,Xn |
| Risk statements (R) | 11-22 |
| Safety statements (S) | 16 |
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-Methylisoxazole-3-carboxaldehyde used for?
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5-Methylisoxazole-3-carboxaldehyde is primarily used as a building block in organic synthesis, particularly for pharmaceutical intermediates and the development of novel chemical entities. It is also of interest in agrochemical research and materials science.
What are the CAS number and molecular formula?
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The CAS number is 62254-74-4 and the molecular formula is C5H5NO2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 5-Methylisoxazole-3-carboxaldehyde with a minimum assay of 95%. This is a technical/research grade material, and TSS does not represent it as USP, BP, or EP grade.
What are the main hazards associated with this chemical?
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This compound is flammable (H228) and harmful if swallowed (H302). It requires careful handling to avoid fire and ingestion. Recommended personal protective equipment includes a dust mask (type N95), eyeshields, and gloves.
How is 5-Methylisoxazole-3-carboxaldehyde packed and shipped?
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As a flammable solid, it is shipped under UN 1325, Class 4.1, Packing Group III. Tech Serve Solutions ensures compliance with all regulations for safe packing and export.
How can I request a sample or quote?
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To request a sample or a quotation for 5-Methylisoxazole-3-carboxaldehyde, please contact our sales team through the website or by phone.
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