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Comprehensive Overview of 3-Ethynyl-2,4-difluoroaniline (CAS No. 1792939-17-3): Properties, Applications, and Industry Insights

3-Ethynyl-2,4-difluoroaniline (CAS No. 1792939-17-3) is a specialized fluorinated aromatic amine compound that has garnered significant attention in pharmaceutical and agrochemical research. This highly functionalized aniline derivative features both ethynyl and difluoro substituents, making it a versatile building block for cross-coupling reactions and click chemistry applications. The strategic placement of fluorine atoms at the 2- and 4-positions significantly alters the compound's electronic properties, enhancing its potential as a bioisostere in drug design.

Recent studies highlight the growing demand for fluorinated organic compounds like 3-Ethynyl-2,4-difluoroaniline in medicinal chemistry. Researchers are particularly interested in its role as a precursor for kinase inhibitors and PET radiotracers, with its ethynyl group enabling efficient conjugation to biomarkers. The compound's lipophilicity profile (LogP ≈ 2.1) and hydrogen bonding capacity make it valuable for optimizing blood-brain barrier permeability in CNS drug development—a hot topic in neuropharmaceutical research.

From a synthetic chemistry perspective, 3-Ethynyl-2,4-difluoroaniline demonstrates remarkable reactivity in Sonogashira couplings and Huisgen cycloadditions. Its ortho-fluorine effect facilitates regioselective transformations, addressing a key challenge in heterocycle synthesis. Material scientists have explored its incorporation into conjugated polymers for organic electronics, where the difluoroaniline moiety enhances charge transport properties—an area gaining traction in flexible display technology development.

The compound's stability profile has been extensively characterized, showing excellent resistance to hydrolytic degradation (pH 2-9) and thermal decomposition (up to 180°C). These properties, combined with its moderate solubility in polar aprotic solvents (DMSO: 45 mg/mL), make it particularly suitable for high-temperature reaction conditions—a frequent search topic among process chemists. Analytical data reveals characteristic NMR shifts (1H: δ 6.8-7.2 ppm; 19F: δ -110 to -120 ppm) that serve as important identification markers.

In the context of green chemistry trends, recent publications discuss improved synthetic routes to 3-Ethynyl-2,4-difluoroaniline using catalytic C-H activation methods, reducing traditional multi-step synthesis challenges. The compound's atom economy and potential for flow chemistry applications align with industry demands for sustainable manufacturing—a dominant theme in current chemical innovation discussions.

Quality control protocols for 1792939-17-3 typically involve HPLC purity analysis (≥98%), residual solvent screening, and heavy metal testing—critical parameters frequently searched by quality assurance professionals. The compound's storage stability under inert atmosphere at 2-8°C has been verified through accelerated stability studies, addressing common chemical storage concerns in research laboratories.

Emerging applications include its use as a fluorescent probe linker in bioimaging systems and as a covalent inhibitor scaffold in proteolysis-targeting chimera (PROTAC) development—two rapidly growing areas in bioconjugation chemistry. The structure-activity relationship studies of derivatives highlight the importance of the 2,4-difluoro pattern for target binding affinity, a subject of numerous medicinal chemistry publications.

From a commercial availability standpoint, 3-Ethynyl-2,4-difluoroaniline is offered by specialized fine chemical suppliers with custom scale-up synthesis capabilities—a service increasingly sought after in contract research organizations. Market analysis indicates steady growth in demand, particularly from biotech startups focusing on targeted drug delivery systems, reflecting broader trends in personalized medicine development.

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