4-Isoxazoleboronic acid pinacol ester
4-Isoxazoleboronic acid pinacol ester (CAS: 928664-98-6), with the molecular formula C9H14BNO3 and a molecular weight of 195.02 g/mol, is a versatile organoboron compound. It belongs to the class of boronate esters and is primarily utilised as a building block in organic synthesis. Its structure makes it valuable for introducing the isoxazole moiety into complex molecules, facilitating research and development in medicinal chemistry and materials science.

Organic Synthesis Reagent
This compound serves as a key intermediate in Suzuki-Miyaura cross-coupling reactions. It enables the formation of new carbon-carbon bonds, crucial for constructing complex organic molecules.
Medicinal Chemistry Research
The isoxazole ring is a common scaffold in pharmaceuticals. This boronate ester facilitates the synthesis of novel drug candidates and the exploration of structure-activity relationships.
Materials Science
It can be employed in the synthesis of functional materials, such as organic semiconductors or polymers, where the isoxazole unit imparts specific electronic or optical properties.
| Molecular weight | 195.02 |
|---|---|
| Empirical formula | C9H14BNO3 |
| Assay | 95% |
| Storage temperature | 2-8°C |
| Melting point | 110-115 °C |

Hazard statements
- H302Harmful if swallowed
- H312Harmful in contact with skin
- H332Harmful if inhaled
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
| Water hazard class (WGK, DE) | 3 |
|---|---|
| Hazard codes (EU) | Xn |
| Risk statements (R) | 20/21/22 |
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 4-Isoxazoleboronic acid pinacol ester used for?
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4-Isoxazoleboronic acid pinacol ester is primarily used as a reagent in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions, for the construction of complex organic molecules relevant to medicinal chemistry and materials science.
What is the CAS number and molecular formula for 4-Isoxazoleboronic acid pinacol ester?
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The CAS number is 928664-98-6, and the molecular formula is C9H14BNO3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Isoxazoleboronic acid pinacol ester with an assay of 95%. This product is intended for research and technical use and is not supplied as USP, BP, EP, or any other pharmacopoeia grade.
What are the safety precautions for handling 4-Isoxazoleboronic acid pinacol ester?
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4-Isoxazoleboronic acid pinacol ester is classified as a GHS07 hazard and carries a Warning signal word. It is harmful if swallowed (H302), harmful in contact with skin (H312), and harmful if inhaled (H332). Appropriate personal protective equipment, such as gloves and respiratory protection (P280), should be used.
How is 4-Isoxazoleboronic acid pinacol ester stored and shipped?
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This product requires storage at 2-8°C. Tech Serve Solutions is a global supplier and exporter experienced in shipping chemicals worldwide.
How can I request a quote or sample for 4-Isoxazoleboronic acid pinacol ester?
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To request a quote or sample, please contact the Tech Serve Solutions sales team via the website or by phone.
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