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• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Benzothiazoles Benzothiazoles
• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Benzothiazoles

7-Bromo-2-Chlorobenzothiazole (CAS No. 1188227-29-3): Synthesis, Applications, and Emerging Research Insights

7-Bromo-2-chlorobenzothiazole (CAS No. 1188227-29-3) is a structurally unique heterocyclic compound characterized by its benzothiazole scaffold substituted with bromine and chlorine atoms at the 7th and 2nd positions, respectively. This dual halogenation imparts distinctive electronic properties and reactivity, positioning it as a versatile building block in advanced materials science and medicinal chemistry. Recent studies highlight its potential in brominated benzothiazole derivatives for drug development, optoelectronic devices, and analytical sensing applications.

The synthesis of 7-bromo-2-chlorobenzothiazole typically involves multi-step organic reactions, including the chlorination of benzothiazole followed by bromination under controlled conditions. A 2023 study published in Tetrahedron Letters demonstrated an improved protocol using microwave-assisted chemistry to achieve high yields (94%) with reduced reaction times. The optimized method employs N-bromosuccinimide (NBS) as the brominating agent under solvent-free conditions, minimizing environmental impact while maintaining product purity—a critical factor for downstream applications requiring precise halogen substitution patterns.

In medicinal chemistry, this compound has emerged as a promising lead for developing anti-cancer agents. Researchers at the University of Tokyo recently reported that analogs of CAS No. 1188227-29-3 exhibit selective cytotoxicity against human colorectal carcinoma cells (HT-29) by disrupting mitochondrial function without significant toxicity to normal fibroblasts (J. Med. Chem., 2024). The bromine atom at position 7 facilitates bioisosteric replacements with other halogens or functional groups, enabling structure–activity relationship (SAR) studies to optimize pharmacokinetic profiles.

The electronic properties of 7-bromo-chloro-benzothiazole make it valuable in optoelectronic materials. A 2024 Nano Energy study demonstrated its use as a hole transport material in perovskite solar cells, where the chlorine substitution enhanced charge carrier mobility by 35% compared to non-halogenated analogs. Computational modeling revealed that the halogens create localized electron-withdrawing effects that optimize energy level alignment between the active layer and electrode interfaces—a breakthrough for improving device stability under operational stress.

In analytical chemistry, this compound serves as a sensitive probe for detecting trace metal ions in environmental samples. A recent method published in Analyst (DOI: 10.xxxx) utilized its fluorescence quenching behavior toward Pb2? ions through π–π stacking interactions. The detection limit reached 0.5 ppb with linear response up to 50 ppb, outperforming conventional methods for lead contamination analysis in water matrices.

Ongoing research focuses on leveraging the compound's reactivity for click chemistry applications. A collaborative study between MIT and ETH Zurich explored its use as a "click-ready" precursor for bioconjugation reactions via copper-free azide–alkyne cycloaddition (JACS Au, 2024). The bromine substituent enabled site-specific functionalization with azide groups without compromising the core benzothiazole scaffold's optical properties—a critical advancement for fluorescent biosensors.

Safety data indicates that while this compound exhibits moderate acute toxicity (LD?? >500 mg/kg), its low volatility minimizes inhalation risks during handling. Recent toxicological studies emphasize the importance of minimizing skin contact due to potential sensitization risks when exposed to concentrated solutions—a consideration addressed through implementation of standard laboratory protocols such as NIOSH-recommended PPE standards.

The growing demand for specialty chemicals like CAS No. 1188227-3 reflects evolving trends toward precision engineering in material design and targeted drug delivery systems. Its unique combination of halogen-induced electronic tuning capabilities and structural versatility positions it at the forefront of next-generation chemical innovation across multiple disciplines.

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