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  Yuan-Jun Tong,Lu-Dan Yu,Lu-Lu Wu,Shu-Ping Cao,Ru-Ping Liang,Li Zhang,Xing-Hua Xia,Jian-Ding Qiu Chem. Commun., 2018,54, 7487-7490
• 3. An automated computational approach to kinetic model discrimination and parameter estimation?
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• Solvents and Organic Chemicals Organic Compounds Benzenoids Thiophenols

5-Fluoro-2-methoxybenzene-1-thiol (CAS No. 84884-41-3): A Versatile Building Block in Modern Organic Synthesis

5-Fluoro-2-methoxybenzene-1-thiol (CAS 84884-41-3) is a fluorinated aromatic thiol compound that has garnered significant attention in pharmaceutical, agrochemical, and materials science research. The presence of both fluoro and methoxy substituents on the benzene ring, along with a reactive thiol (-SH) group, makes this molecule a valuable intermediate for constructing complex architectures. Recent studies highlight its role in cross-coupling reactions, ligand design, and bioactive molecule synthesis, aligning with the growing demand for fluorinated compounds in drug discovery.

The compound's unique electronic properties stem from the electron-withdrawing fluorine atom and electron-donating methoxy group, creating a polarized system that facilitates nucleophilic aromatic substitution (SNAr) reactions. Researchers frequently employ 5-fluoro-2-methoxybenzenethiol (alternative naming convention) in palladium-catalyzed couplings, where the thiol group acts as a directing moiety or participates in C-S bond formation. Its applications extend to OLED materials development, where fluorinated thiols contribute to improved electron transport characteristics.

In the context of green chemistry trends, CAS 84884-41-3 has been investigated as a precursor for sustainable catalysis systems. The methoxy-thiol combination enables chelation to transition metals, forming catalysts for asymmetric synthesis – a hot topic in pharmaceutical manufacturing. Analytical techniques like HPLC-MS and 19F NMR are commonly used to characterize this compound, addressing researchers' frequent queries about fluorinated compound analysis methods.

The thermal stability of 5-fluoro-2-methoxybenzene-1-thiol (often searched as "fluoromethoxy benzenethiol stability") makes it suitable for high-temperature reactions, a property leveraged in polymer modification. Material scientists value its ability to introduce surface functionalization through thiol-gold interactions, relevant for nanotechnology applications. Storage typically requires inert atmosphere conditions due to the thiol group's sensitivity to oxidation, a practical consideration often discussed in chemical handling forums.

Recent patent literature reveals innovative uses of 84884-41-3 in proteolysis-targeting chimeras (PROTACs) development, addressing the pharmaceutical industry's focus on targeted protein degradation. The compound's meta-substitution pattern (fluoro at position 5 relative to thiol) creates distinct steric and electronic effects compared to ortho- or para-substituted analogs – a differentiation point frequently explored in structure-activity relationship (SAR) studies.

From a synthetic chemistry perspective, 5-fluoro-2-methoxybenzenethiol serves as a precursor for heterocyclic compounds through cyclocondensation reactions. The fluorine atom's presence enables subsequent radiofluorination for PET imaging agents, connecting to the booming theranostics field. Purity assessment typically focuses on thiol content determination via Ellman's assay or iodometric titration, addressing quality control aspects crucial for commercial suppliers.

Environmental fate studies of fluorinated thiols like CAS 84884-41-3 have gained attention regarding persistent organic pollutants (POPs) research. The compound's biodegradation pathways and ecotoxicity profile represent active investigation areas, particularly concerning fluorine-containing environmental contaminants – a subject with increasing regulatory importance. These aspects make the compound relevant to green chemistry metrics discussions and benign-by-design initiatives.

In material science applications, the thiol-ene click chemistry capability of 5-fluoro-2-methoxybenzene-1-thiol enables efficient polymer functionalization. Researchers frequently search for "fluorinated thiol click chemistry" applications, particularly in self-assembled monolayers (SAMs) for electronic devices. The compound's liquid crystalline behavior when incorporated into mesogenic structures has also been documented, expanding its utility beyond traditional organic synthesis.

The commercial availability of 84884-41-3 from specialty chemical suppliers often includes custom synthesis options, reflecting demand from medicinal chemistry groups. Price considerations typically relate to fluorination method efficiency and protection-deprotection strategies during synthesis – technical points commonly raised in process chemistry optimization discussions. Analytical certificates usually specify GC purity and water content, key parameters for sensitive applications.

Future research directions for 5-fluoro-2-methoxybenzene-1-thiol may explore its coordination chemistry with rare earth metals or applications in battery electrolyte additives, areas gaining traction in energy storage research. The compound's dual functionality positions it well for multicomponent reactions, a strategy increasingly adopted for library synthesis in drug discovery programs. These evolving applications ensure continued relevance of this fluorinated building block in cutting-edge chemical research.

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