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Description
5-Fluoro-2-methylbenzonitrile is an aromatic nitrile carrying a fluorine atom and a methyl group on the benzene ring. In laboratory practice, the cyano group acts as a masked functional group that can be converted into a range of other functionalities: hydrolysis delivers a carboxylic acid or an amide, reduction gives a primary benzylic amine, and cycloaddition with an azide produces a tetrazole ring. Because a single starting material can branch into many derivatives, this compound is frequently chosen as a strategic node when chemists design several analogues at once from one common precursor.
The key characteristics behind its selection are the high stability of the nitrile group combined with an already well-ordered substitution pattern. The cyano group is strongly electron-withdrawing, so the ring becomes less reactive toward electrophiles yet more receptive to nucleophilic aromatic substitution at the appropriate position. The fluorine atom reinforces that effect while also serving as an analytical marker in fluorine NMR, and the methyl group in the ortho position provides a site for benzylic functionalisation. The nitrile likewise tolerates many reaction conditions, so it can be left intact through several synthetic stages and unmasked only when needed.
In Indonesian laboratories, this building block is typically handled in university research groups, pharmaceutical and agrochemical development units, and contract synthesis facilities working on fluorinated target molecules. It is generally used at the milligram-to-gram scale during route scouting and analogue preparation, where one precursor is divided across several parallel experiments. Its role is usually that of an intermediate held in the chemical store for multi-step work rather than a routine consumable.
Laboratory Applications
Multi-step organic synthesis — the nitrile survives many reaction conditions unchanged, allowing chemists to carry the ring through several stages and unmask the functional group only at the final step.
Carboxylic acid and amide preparation — hydrolysis of the cyano group provides direct access to the corresponding acid or amide without requiring a separately purchased and stored starting material.
Primary benzylic amine synthesis — reduction of the nitrile yields a benzylic amine bearing a fluorinated aromatic ring, a fragment commonly required in medicinal chemistry scaffolds.
Tetrazole ring construction — cycloaddition of the cyano group with an azide builds a tetrazole, a widely used carboxylic acid bioisostere in pharmaceutical research programmes.
Nucleophilic aromatic substitution studies — the electron-withdrawing cyano group and the fluorine substituent together activate the ring toward nucleophilic attack at defined positions, supporting controlled analogue preparation.
Specifications
Brand: TCI
Catalogue code: F0747
CAS number: 77532-79-7
Category: Chemistry > Building Blocks > Fluorinated Building Blocks
Pack sizes: research-scale packs as listed by the manufacturer; please confirm the available size when ordering
Storage: keep in a tightly closed container in a cool, dry place away from light
Handling and Storage
Store the material in its original tightly closed container in a cool, dry, well-ventilated chemical store, protected from direct light and kept away from strong oxidising agents, strong acids, and strong bases. Amber glass or the supplier's original packaging is suitable, and the container should be reclosed promptly after each use to limit moisture uptake. Handle the compound in a working fume hood while wearing safety glasses, a laboratory coat, and chemically resistant gloves. Weigh and transfer only the quantity required, avoid the formation of dust or aerosols, and consult the manufacturer's safety data sheet before first use. Collect residues and contaminated consumables as halogenated organic chemical waste in accordance with institutional disposal procedures.
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