4,5-Difluoro-2-ethoxyphenylboronic acid
4,5-Difluoro-2-ethoxyphenylboronic acid (CAS: 870778-87-3) is a fluorinated aryl boronic acid derivative with a molecular weight of 201.96 g/mol. This compound serves as a valuable building block in organic synthesis, particularly in cross-coupling reactions. Its unique difluoro-ethoxy substitution pattern makes it a useful intermediate for the development of novel compounds in pharmaceutical and materials science research, offering specific electronic and steric properties.
- Synonyms
- 4,5-Difluoro-2-ethoxyphenylboronic acid

Organic Synthesis Intermediate
Utilised as a key building block in Suzuki-Miyaura cross-coupling reactions for the synthesis of complex organic molecules. Its fluorinated structure can impart desirable properties to target compounds.
Pharmaceutical Research
Employed in the discovery and development of new active pharmaceutical ingredients (APIs). The difluoroethoxyphenyl motif can be incorporated into potential drug candidates to modulate their biological activity.
Materials Science
Investigated for its potential use in the development of advanced materials. Aryl boronic acids are often precursors to organic electronic materials and polymers with tailored properties.
| Molecular weight | 201.96 |
|---|---|
| Empirical formula | C8H9BF2O3 |
| Melting point | 136-140 °C |

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 4,5-Difluoro-2-ethoxyphenylboronic acid used for?
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4,5-Difluoro-2-ethoxyphenylboronic acid (CAS: 870778-87-3) is primarily used as an intermediate in organic synthesis, particularly for cross-coupling reactions in pharmaceutical research and materials science.
What are the CAS number and formula for 4,5-Difluoro-2-ethoxyphenylboronic acid?
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The CAS number is 870778-87-3 and the molecular formula is C8H9BF2O3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4,5-Difluoro-2-ethoxyphenylboronic acid typically as a research-grade chemical. The specific assay is available on the product's Certificate of Analysis. TSS does not represent this product as USP, BP, or EP grade.
How should 4,5-Difluoro-2-ethoxyphenylboronic acid be handled?
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Handle with care. This compound is classified as a Warning (GHS07) and may cause skin irritation (H315), eye irritation (H319), and respiratory irritation (H335). Use appropriate personal protective equipment including eyeshields, gloves, and a dust mask (N95 recommended).
Is 4,5-Difluoro-2-ethoxyphenylboronic acid a controlled substance?
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Based on the provided data, there is no indication that 4,5-Difluoro-2-ethoxyphenylboronic acid is a controlled substance.
How is 4,5-Difluoro-2-ethoxyphenylboronic acid packed and shipped?
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Tech Serve Solutions exports this chemical globally. Packaging is designed to maintain product integrity during transit, adhering to international shipping regulations for chemicals.
How can I request a sample or a quote for 4,5-Difluoro-2-ethoxyphenylboronic acid?
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Please contact our sales team directly through our website or by phone to request a sample or obtain a quotation for 4,5-Difluoro-2-ethoxyphenylboronic acid.
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