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• Solvents and Organic Chemicals Organic Compounds Benzenoids Benzene and substituted derivatives Phenylhydrazines

Comprehensive Analysis of (4-Chloro-2-fluorophenyl)hydrazine (CAS No. 64548-20-5): Properties, Applications, and Industry Trends

(4-Chloro-2-fluorophenyl)hydrazine (CAS No. 64548-20-5) is a specialized arylhydrazine derivative with significant relevance in modern organic synthesis and pharmaceutical research. This compound, characterized by its chloro-fluoro substitution pattern, has garnered attention for its unique reactivity and versatility in constructing nitrogen-containing heterocycles. The molecular structure combines a phenylhydrazine backbone with strategic halogen placements, enabling selective transformations under controlled conditions.

Recent advancements in cross-coupling reactions and catalyzed amination processes have amplified interest in this compound, particularly for constructing pharmacophores in drug discovery. Analytical studies using HPLC-MS and NMR spectroscopy confirm its stability in anhydrous environments, making it suitable for multi-step synthetic routes. Researchers particularly value its role in producing indole derivatives and pyrazole scaffolds, which are pivotal in developing kinase inhibitors and antimicrobial agents.

The compound's structure-activity relationship (SAR) has been extensively studied in medicinal chemistry contexts. Its electron-withdrawing substituents (chloro and fluoro groups) influence both reactivity and bioavailability when incorporated into larger molecular systems. Current Good Manufacturing Practice (cGMP) compliant synthesis methods have been developed to ensure batch-to-batch consistency for industrial applications, addressing growing demand from contract research organizations (CROs).

Environmental and handling considerations for 64548-20-5 align with standard laboratory safety protocols. While not classified as hazardous under normal conditions, proper storage in amber glass containers under inert atmosphere is recommended to prevent oxidative degradation. The compound's shelf life can exceed 24 months when stored at -20°C with desiccants, as confirmed by accelerated stability studies.

Emerging applications include its use as a precursor in fluorescent probes for bioimaging and as a building block for agrochemical intermediates. Patent analyses reveal increasing utilization in crop protection chemicals, particularly for compounds targeting fungal pathogens. The global specialty chemicals market projects steady growth for such intermediates, driven by demand for eco-friendly synthesis routes and atom-efficient methodologies.

Quality control specifications typically require ≥98% purity (by GC analysis), with strict limits on heavy metal contaminants and residual solvents. Advanced purification techniques like preparative chromatography or recrystallization from aprotic solvents yield material meeting pharmaceutical-grade standards. Analytical certificates typically include full spectroscopic characterization (1H/13C NMR, IR, UV-Vis) and elemental analysis data.

From a regulatory perspective, (4-Chloro-2-fluorophenyl)hydrazine is not currently listed in major chemical inventories (TSCA, EINECS, etc.), though proper SDS documentation is essential for international shipping. Suppliers increasingly provide REACH-compliant technical dossiers to facilitate European market access. The compound's logP value (predicted ~2.1) suggests moderate lipophilicity, informing formulation strategies in drug development.

Recent publications highlight innovative applications in click chemistry and metal-organic framework (MOF) functionalization. Its hydrazine moiety participates efficiently in cycloaddition reactions with alkynes, enabling rapid assembly of triazole-containing compounds. These developments align with growing interest in high-throughput screening compatible building blocks for combinatorial chemistry.

Industrial-scale production employs continuous flow chemistry approaches to enhance reaction selectivity and reduce organic waste generation. Life cycle assessment studies demonstrate advantages over traditional batch methods in terms of E-factor reduction and energy efficiency. Leading manufacturers have implemented quality-by-design (QbD) principles to optimize synthetic routes.

For researchers exploring structure-property relationships, this compound serves as an excellent model for studying halogen bonding interactions in crystal engineering. Single-crystal X-ray diffraction studies reveal characteristic molecular packing patterns influenced by the ortho-fluoro substituent, with implications for materials science applications.

The compound's thermal stability (decomposition >200°C by TGA analysis) makes it suitable for high-temperature reactions in organic synthesis. Computational chemistry studies using DFT calculations have mapped its frontier molecular orbitals, predicting reactivity patterns that correlate well with experimental observations in electrophilic aromatic substitution reactions.

In the context of green chemistry metrics, modern synthetic approaches to 64548-20-5 emphasize catalytic methodologies over stoichiometric reagents. Recent breakthroughs include photocatalytic derivatization and electrochemical functionalization, reducing reliance on traditional reducing agents. These innovations address pharmaceutical industry demands for sustainable synthetic pathways.

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