Chemical Identity and Structural Features

4-Amino-3-bromo-5-fluorobenzonitrile (SKU: A731672; molecular formula C₇H₄BrFN₂; MW ≈ 215.02 g/mol) is a para-aminobenzonitrile derivative carrying ortho-bromine and ortho-fluorine substituents relative to the amino group. This arrangement places four distinct functional handles on a single aromatic ring: a nucleophilic primary amine (–NH₂), an electrophilic aryl bromide (C–Br) available for oxidative-addition pathways, an electron-withdrawing aryl fluoride (C–F) susceptible to nucleophilic aromatic substitution (SNAr), and an electron-withdrawing nitrile (–CN) that activates the ring toward nucleophilic attack while also serving as a precursor to amidines, tetrazoles, and carboxylic acids.

The combined electron-withdrawing effect of the –CN and –F groups lowers the electron density of the ring, enhancing SNAr reactivity at the C–F position. Simultaneously, the –NH₂ group can be selectively protected or transformed (e.g., diazotization, acylation, reductive amination) to introduce additional diversity. This rich multi-functionality makes the compound a highly sought-after building block in targeted synthesis campaigns.

Synthetic Applications and Reaction Pathways

The aryl bromide moiety of 4-Amino-3-bromo-5-fluorobenzonitrile is well-suited for palladium-catalyzed cross-coupling reactions, including Suzuki–Miyaura (with aryl- or alkenylboronic acids), Buchwald–Hartwig amination (to introduce N-based fragments), and Sonogashira coupling (to install alkynyl groups). These transformations allow efficient diversification of the core scaffold for structure–activity relationship (SAR) studies in drug discovery programs.

The C–F bond, activated by the flanking electron-withdrawing groups, undergoes SNAr with nitrogen, oxygen, and sulfur nucleophiles under mild-to-moderate conditions, enabling access to diaryl ethers, anilines, and thioethers without requiring transition-metal catalysis. The nitrile group provides a handle for conversion to primary amides (partial hydrolysis), carboxylic acids (full hydrolysis), amidines (reaction with amines under specific conditions), or 5-substituted tetrazoles (cycloaddition with azides), greatly expanding the accessible chemical space from a single starting material.

The free amine can undergo diazotization followed by Sandmeyer-type reactions to replace –NH₂ with –Cl, –Br, –CN, –OH, or –F, or can be directly acylated, sulfonylated, or reductively alkylated to generate secondary and tertiary amine products relevant to pharmaceutical leads.

Handling, Safety, and Storage Guidelines

As with all aromatic amines and halogenated organic compounds, 4-Amino-3-bromo-5-fluorobenzonitrile should be handled with appropriate personal protective equipment (PPE), including nitrile gloves, a laboratory coat, and safety goggles. Operations that may generate dust or aerosols should be conducted in a fume hood to minimize inhalation exposure. Avoid contact with skin and eyes.

The compound should be stored in a tightly sealed container in a cool, dry, and well-ventilated area away from direct light, moisture, and incompatible materials such as strong oxidizers, strong acids, and strong bases. Recommended storage temperature is typically 2–8 °C or room temperature as specified on the product label; consult the Aladdin Scientific product page for the definitive specification. Under appropriate storage conditions, the compound maintains its purity and integrity for the duration of the stated shelf life.

Dispose of waste material in accordance with local, national, and institutional regulations for halogenated organic waste. Consult the Safety Data Sheet (SDS) provided by Aladdin Scientific for complete hazard classifications, first-aid measures, and disposal instructions before use.

Quality Specifications and Purity Considerations

For research applications—particularly in medicinal chemistry and materials science—reagent purity is critical to reproducibility and data integrity. 4-Amino-3-bromo-5-fluorobenzonitrile (A731672) from Aladdin Scientific is supplied with purity specifications verified by standard analytical methods. Researchers should confirm the Certificate of Analysis (CoA) accompanying each lot for the specific purity value, identity confirmation (e.g., NMR, HPLC, or GC data), and appearance.

Common analytical techniques used to verify the identity and purity of this compound include: Proton NMR (to confirm substitution pattern and absence of regioisomeric impurities), HPLC (to quantify purity and detect trace impurities), and Mass Spectrometry (to confirm molecular weight and isotope pattern consistent with the mono-bromo, mono-fluoro substitution). The characteristic bromine isotope pattern (approximately 1:1 ratio of ⁷⁹Br and ⁸¹Br) in the mass spectrum provides unambiguous confirmation of the aryl bromide.

Researchers requiring higher purity grades for demanding applications (e.g., polymerization, biological assays) should contact Aladdin Scientific technical support to inquire about available purity grades and custom specifications.