Phenylboronic Acid丨CAS 98-80-6

Phenylboronic acid丨CAS 98-80-6 is an aromatic boronic acid and a key building block in organic synthesis. Due to its chemical reactivity and functional group compatibility, it plays a central role in cross-coupling reactions, sensor technologies, biochemistry, and material science. It is a white to off-white crystalline solid, soluble in many organic solvents and water under certain conditions.

1. Organic Synthesis
✔️ Suzuki–Miyaura Cross-Coupling Reaction
● Phenylboronic acid is best known as a reagent in the Suzuki coupling reaction, where it reacts with aryl or vinyl halides in the presence of a palladium catalyst to form biaryl compounds.
● This reaction is widely used to construct C–C bonds in the pharmaceutical, agrochemical, and materials industries.
✔️ Heck and Sonogashira-type Reactions
● Though primarily associated with Suzuki couplings, it can also participate indirectly in multi-step syntheses involving other cross-coupling reactions.

2. Pharmaceutical Chemistry
✔️ Intermediate for Drug Synthesis
● Phenylboronic acid is an important intermediate in the synthesis of several API scaffolds and drug candidates, particularly in anticancer and antiviral research.
● Its ability to create stable biaryl and heteroaryl linkages is essential for developing bioactive molecules.

3. Biochemical and Biomedical Applications
✔️ Sugar Sensing and Glucose Monitoring
● Boronic acids, including phenylboronic acid, form reversible covalent bonds with diols, especially sugars like glucose.
● This makes phenylboronic acid highly useful in glucose sensors, biosensors, and fluorescent probes for diabetes management and bioimaging.
✔️ Cell Surface and Protein Targeting
● Used in designing molecules that bind selectively to glycoproteins and cell surfaces, phenylboronic acid derivatives can aid in targeted drug delivery and bioconjugation.

4. Polymer and Material Science
✔️ Smart Hydrogels
● Phenylboronic acid丨CAS 98-80-6-containing monomers are used to develop stimuli-responsive hydrogels that swell or contract in response to pH or glucose levels.
● These are being researched for use in drug delivery systems, contact lenses, and tissue engineering.
✔️ Functional Materials
● Incorporated into polymers, resins, and supramolecular assemblies to impart selective binding, electronic tuning, or optical properties.

5. Analytical Chemistry
✔️ Affinity Chromatography
● Phenylboronic acid-functionalized resins are used in affinity chromatography to purify glycoproteins, nucleotides, and carbohydrate-rich compounds from biological mixtures.
✔️ Chemical Probes
● Acts as a chemosensor component for detecting anions, diols, or metal ions, especially in aqueous media.

✅ Versatile Reactivity
● The dual nature of boronic acids (nucleophilic boron and electrophilic aromatic ring) provides diverse reactivity for C–C, C–N, and C–O bond formations.
✅ Selective Sugar Binding
● The reversible covalent bonding with cis-diols allows specific and sensitive detection of sugars, making it ideal for biosensing technologies.
✅ Low Toxicity and Good Stability
● Phenylboronic acid is relatively non-toxic and chemically stable under normal laboratory conditions, enabling safe and scalable use.
✅ Water Compatibility
● Unlike many organic reagents, phenylboronic acid shows activity in aqueous conditions, essential for biological and environmental applications.

Conclusion
Phenylboronic acid丨CAS 98-80-6 is a small yet powerful compound with a wide range of applications in organic chemistry, biotechnology, and materials science. Its central role in Suzuki coupling, combined with unique diol-binding capabilities, makes it invaluable in both industrial processes and cutting-edge research. Its multifunctionality ensures it remains a vital reagent in developing future technologies in healthcare, sensing, and smart materials.