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Comprehensive Overview of 2-Ethynyl-6-fluorobenzaldehyde (CAS No. 137338-08-0): Properties, Applications, and Industry Insights

2-Ethynyl-6-fluorobenzaldehyde (CAS No. 137338-08-0) is a specialized organic compound that has garnered significant attention in pharmaceutical and material science research. This fluorinated benzaldehyde derivative features a unique combination of an ethynyl group and a fluorine substituent, making it a versatile building block for synthesizing complex molecules. Its molecular formula C₉H₅FO and molecular weight of 148.14 g/mol position it as a critical intermediate in modern organic chemistry.

The compound's structural uniqueness lies in its aldehyde functionality at the 1-position, coupled with an ethynyl group at the 2-position and a fluorine atom at the 6-position. This arrangement enables diverse reactivity patterns, particularly in click chemistry reactions and cross-coupling transformations. Researchers frequently utilize 2-Ethynyl-6-fluorobenzaldehyde as a precursor for developing fluorinated heterocycles, which are increasingly important in drug discovery programs targeting improved metabolic stability and membrane permeability.

Recent trends in green chemistry have spurred interest in optimizing synthetic routes for 137338-08-0. Many laboratories now focus on developing catalyst-free methodologies or microwave-assisted syntheses to improve the compound's production efficiency. The fluorination pattern makes this derivative particularly valuable for designing PET radiotracers, with several studies exploring its potential in neuroimaging probes for Alzheimer's disease research.

From a commercial perspective, 2-Ethynyl-6-fluorobenzaldehyde has seen growing demand in the electronic materials sector. Its molecular architecture proves useful in developing organic semiconductors and liquid crystal compounds, where the fluorine atom enhances thermal stability and the ethynyl group facilitates polymerization. Manufacturers often highlight its role in creating high-performance OLED materials, responding to the booming display technology market.

Quality control of CAS 137338-08-0 typically involves rigorous analytical techniques. High-performance liquid chromatography (HPLC) with UV detection remains standard for purity assessment, while nuclear magnetic resonance (NMR) spectroscopy confirms structural integrity. The compound generally appears as a pale yellow to colorless crystalline solid with characteristic aldehyde proton signals around δ 10 ppm in ¹H NMR spectra.

Storage and handling recommendations for 2-Ethynyl-6-fluorobenzaldehyde emphasize protection from moisture and oxidation. Most suppliers recommend storing the material at 2-8°C under inert atmosphere, with typical shelf lives of 24 months when properly sealed. The compound's limited solubility in water but good solubility in common organic solvents like dichloromethane and tetrahydrofuran influences its laboratory applications.

Emerging research explores the compound's potential in bioconjugation chemistry, particularly for creating fluorescent probes and protein labeling reagents. The ethynyl moiety readily participates in copper-catalyzed azide-alkyne cycloaddition (CuAAC), while the fluorine atom provides opportunities for radiofluorination strategies. These applications align with current interests in theranostic agents and targeted drug delivery systems.

Regulatory aspects of 137338-08-0 vary by region, but most jurisdictions classify it as a standard laboratory chemical. Suppliers typically provide detailed safety data sheets (SDS) that outline proper handling procedures. The compound's low ecotoxicity profile makes it preferable to many halogenated alternatives in sustainable chemistry initiatives.

The global market for 2-Ethynyl-6-fluorobenzaldehyde reflects broader trends in fine chemical demand. Pharmaceutical companies account for approximately 65% of consumption, followed by academic research institutions (25%) and material science applications (10%). Pricing remains stable, with most suppliers offering quantities ranging from 100mg to 1kg batches to accommodate diverse research needs.

Future developments surrounding CAS 137338-08-0 will likely focus on expanding its utility in catalyzed asymmetric synthesis and metal-organic frameworks (MOFs). The compound's balanced lipophilicity and electronic properties continue to attract interest for designing enzyme inhibitors and allosteric modulators in medicinal chemistry programs worldwide.

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