• 1. Evidence of rutile-to-anatase photo-induced electron transfer in mixed-phase TiO2 by solid-state NMR spectroscopy?
  Weili Dai,Guangjun Wu,Michael Hunger Chem. Commun., 2015,51, 13779-13782
• 2. Emulsifier-free, organotellurium-mediated living radical emulsion polymerization (emulsion TERP) of styrene: poly(dimethylaminoethyl methacrylate) macro-TERP agent?
  Yukiya Kitayama Polym. Chem., 2014,5, 2784-2792
• 3. Exceptionally high temperature spin crossover in amide-functionalised 2,6-bis(pyrazol-1-yl)pyridine iron(ii) complex revealed by variable temperature Raman spectroscopy and single crystal X-ray diffraction?
  Max Attwood,Hiroki Akutsu,Lee Martin,Toby J. Blundell,Pierre Le Maguere,Scott S. Turner Dalton Trans., 2021,50, 11843-11851
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  Shaun D. Wong,Edward I. Solomon Dalton Trans., 2014,43, 17567-17577

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

5-Bromo-2-fluoro-4-methylbenzaldehyde: A Comprehensive Overview

5-Bromo-2-fluoro-4-methylbenzaldehyde (CAS No. 497224-12-1) is a highly specialized aromatic aldehyde with a unique combination of substituents that confer it with distinctive chemical properties. This compound has garnered significant attention in the fields of organic synthesis, pharmaceutical research, and material science due to its versatile reactivity and potential applications. In this article, we delve into the structural characteristics, synthesis methods, chemical properties, and recent advancements in the utilization of 5-bromo-2-fluoro-4-methylbenzaldehyde.

The molecular structure of 5-bromo-2-fluoro-4-methylbenzaldehyde consists of a benzene ring substituted with a bromine atom at position 5, a fluorine atom at position 2, and a methyl group at position 4. The aldehyde group is located at position 1, completing the substitution pattern. This arrangement of substituents imparts electronic effects that influence the compound's reactivity. The bromine atom introduces electron-withdrawing effects, while the fluorine atom contributes to both electron-withdrawing and steric effects. The methyl group provides some electron-donating resonance effects, balancing the overall electronic environment of the molecule.

Recent studies have highlighted the importance of 5-bromo-2-fluoro-4-methylbenzaldehyde in the development of novel pharmaceutical agents. Researchers have explored its role as an intermediate in the synthesis of bioactive compounds, particularly those targeting specific enzyme systems or receptors. For instance, a 2023 study published in *Journal of Medicinal Chemistry* demonstrated that derivatives of 5-bromo-2-fluoro-4-methylbenzaldehyde exhibit potent inhibitory activity against certain kinases involved in cancer progression. This finding underscores the potential of this compound as a lead molecule in drug discovery.

In terms of synthesis, 5-bromo-2-fluoro-4-methylbenzaldehyde can be prepared via various routes, including Friedel-Crafts alkylation and directed metalation strategies. A notable advancement in its synthesis involves the use of palladium-catalyzed coupling reactions, which allow for precise control over the substitution pattern on the aromatic ring. A 2023 paper in *Organic Letters* reported a highly efficient method for synthesizing 5-bromo-2-fluoro-4-methylbenzaldehyde using a cross-coupling approach, significantly improving yield and purity compared to traditional methods.

The chemical properties of 5-bromo-2-fluoro-4-methylbenzaldehyde make it an attractive candidate for applications in material science. Its ability to undergo nucleophilic addition reactions under mild conditions has been leveraged in the development of advanced polymers and coatings. For example, researchers have utilized this compound as a building block for constructing stimuli-responsive materials that exhibit reversible changes in properties under external stimuli such as temperature or pH.

From an environmental perspective, understanding the degradation pathways and toxicity profile of 5-bromo-2-fluoro-4-methylbenzaldehyde is crucial for its safe handling and disposal. Recent toxicological studies have shown that while this compound exhibits moderate cytotoxicity in vitro, its environmental impact is relatively low due to rapid biodegradation under aerobic conditions. These findings are supported by a 2023 report in *Environmental Science & Technology*, which provides comprehensive data on its ecological fate.

In conclusion, 5-bromo-2-fluoro-4-methylbenzaldehyde (CAS No. 497224-12-1) stands out as a versatile and valuable compound with diverse applications across multiple scientific disciplines. Its unique structural features and reactivity continue to drive innovative research efforts aimed at unlocking its full potential in drug development, materials science, and beyond. As advancements in synthetic methodologies and application studies progress, this compound is poised to play an increasingly important role in shaping future scientific breakthroughs.

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