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Description
TCI D3726, also known as 4-Fluoro-1,2-phenylenediamine, is a benzene derivative carrying two neighbouring amine groups at positions 1 and 2 together with a single fluorine atom at position 4. In the laboratory it belongs to the highly sought-after class of fluorinated building blocks, because the ortho-diamine pattern is the key to forming many nitrogen heterocyclic rings. Researchers use it to construct benzimidazole, quinoxaline, and benzotriazole frameworks — the cores of a wide range of bioactive molecules and functional materials — in a single, comparatively straightforward condensation step.
The main property that makes this compound a preferred choice is the reactivity of the ortho amine pair, which condenses readily with carboxylic acids, aldehydes, or 1,2-dicarbonyl compounds to close five- or six-membered rings. The single fluorine atom then adds value of its own: fluorine modifies the electron density of the ring, improves metabolic stability in drug candidates, influences lipophilicity, and at the same time provides an extremely sensitive marker for fluorine-19 nuclear magnetic resonance spectroscopy. It should be noted that ortho-phenylenediamines are generally prone to oxidation by air and light, so careful handling preserves the quality of the material.
In Indonesian laboratories, this building block is typically used in synthetic organic chemistry groups at universities and research institutes, as well as in pharmaceutical and materials research units that prepare heterocyclic scaffolds for further study. It suits work where a fluorinated aromatic diamine is needed as a starting point for ring-closure chemistry, and where the fluorine label supports later structural confirmation by spectroscopic analysis.
Laboratory Applications
- Benzimidazole synthesis — the ortho-diamine pair condenses with carboxylic acids or aldehydes in one relatively simple step to close the fused five-membered imidazole ring.
- Quinoxaline preparation — reaction with 1,2-dicarbonyl compounds closes a six-membered ring directly, giving fluorinated quinoxaline cores used in bioactive molecules and functional materials.
- Benzotriazole framework construction — the neighbouring amine groups provide the required nitrogen pattern for building benzotriazole scaffolds that serve as cores in many functional compounds.
- Medicinal chemistry building block work — the single fluorine atom improves metabolic stability in drug candidates and influences lipophilicity, both important when designing screening libraries.
- Fluorine-19 NMR-supported studies — the fluorine substituent acts as an extremely sensitive spectroscopic marker, allowing reaction progress and product structure to be confirmed by fluorine-19 NMR.
Specifications
- Brand: TCI
- CAS number: 367-31-7
- Chemical name: 4-Fluoro-1,2-phenylenediamine
- Category: Chemistry > Building Blocks > Fluorinated Building Blocks
- Pack sizes: available in the standard research-scale catalogue pack sizes offered by TCI for this item; please confirm the pack size required when ordering
- Storage note: ortho-phenylenediamines are generally sensitive to air and light and should be stored protected from both
Handling and Storage
Because ortho-phenylenediamines are generally prone to oxidation by air and light, this material should be kept in its tightly closed original container, protected from light, and stored in a cool, dry, well-ventilated place away from oxidising agents. Amber or opaque containers are suitable for aliquots, and headspace should be minimised; working under an inert atmosphere helps preserve quality once the container has been opened. Handle in a fume hood using gloves, safety glasses, and a laboratory coat, avoiding inhalation of dust and contact with skin and eyes. Weigh out only what is needed, reseal promptly, and follow the manufacturer's safety data sheet along with local institutional waste-disposal procedures.
