• 1. Palladium-catalyzed direct desulfitative C2 arylations of 3-halo-N-protected indoles using (hetero)arenesulfonyl chlorides
  Anoir Hfaiedh,Hamed Ben Ammar,Jean-Fran?ois Soulé,Henri Doucet Org. Biomol. Chem. 2016 14 4947
• 2. Desulfitative Pd-catalysed coupling reaction using benzenesulfonyl chlorides and enones as the coupling partners
  Kedong Yuan,Rui Sang,Jean-Fran?ois Soulé,Henri Doucet Catal. Sci. Technol. 2015 5 2904
• 3. An X-ray diffraction determination of the structure of N-ethyl-2,2,4,4,6,6-hexaphenyl-3-azacyclotrisiloxane
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• Solvents and Organic Chemicals Organic Compounds Benzenoids Benzene and substituted derivatives Benzenesulfonyl compounds Benzenesulfonyl halides

3,5-Dichlorobenzenesulfonyl chloride (CAS No. 705-21-5): A Versatile Intermediate in Pharmaceutical and Organic Synthesis

3,5-Dichlorobenzenesulfonyl chloride, a key chemical compound with the molecular formula C₇H₄Cl₂OS, is widely recognized as a critical intermediate in the synthesis of various pharmaceuticals and agrochemicals. Its unique structural features, including the 3,5-dichloro substitution pattern and the sulfonate chloride functionality, make it a valuable reagent in modern chemical synthesis. The CAS No. 705-21-5 identifier ensures precise identification of this compound, which is often utilized in the development of novel therapeutic agents and functional materials.

Recent studies have highlighted the role of 3,5-Dichlorobenzenesulfonyl chloride in the synthesis of bioactive molecules targeting inflammatory and neurodegenerative diseases. A 2023 publication in Journal of Medicinal Chemistry demonstrated its utility as a sulfonating agent in the preparation of selective COX-2 inhibitors, which are critical for managing chronic inflammatory conditions. This application underscores the compound's importance in drug discovery pipelines aimed at improving therapeutic outcomes with reduced side effects.

The structural versatility of 3,5-Dichlorobenzenesulfonyl chloride has also been explored in the context of green chemistry. A 2024 study published in Green Chemistry reported its use in catalytic cross-coupling reactions under mild conditions, reducing the environmental impact of synthetic processes. This aligns with the growing emphasis on sustainable methodologies in pharmaceutical manufacturing, where the CAS No. 705-21-5 compound is increasingly valued for its compatibility with eco-friendly protocols.

Advancements in asymmetric synthesis have further expanded the application scope of 3,5-Dichlorobenzenesulfonyl chloride. Researchers at the University of Tokyo (2024) demonstrated its effectiveness in the enantioselective synthesis of chiral sulfonamide derivatives, which are crucial for the development of antiviral and anticancer drugs. The compound's ability to serve as a chiral auxiliary in these reactions highlights its role in addressing the challenges of stereoselectivity in complex molecule synthesis.

From a mechanistic perspective, the reactivity of 3,5-Dichlorobenzenesulfonyl chloride is primarily attributed to its sulfonate chloride group, which acts as an electrophilic species in nucleophilic substitution reactions. This property enables its use in the synthesis of sulfonamides, a class of compounds with diverse biological activities. Recent computational studies (2023) have modeled the transition states of its reaction pathways, providing insights into optimizing reaction conditions for industrial-scale production.

The compound's applications extend beyond pharmaceuticals into material science. A 2024 paper in Advanced Materials described its use in the fabrication of conductive polymers for organic electronics. The CAS No. 705-21-5 compound's sulfonate group facilitates charge transfer properties, making it suitable for applications in flexible electronics and energy storage devices. This interdisciplinary use exemplifies the compound's adaptability across scientific domains.

Regulatory considerations for the use of 3,5-Dichlorobenzenesulfonyl chloride have also been addressed in recent guidelines. The European Chemicals Agency (ECHA) has updated its classification for this compound, emphasizing the need for proper handling in industrial settings. These guidelines ensure that its applications remain aligned with safety standards while maintaining its utility in research and development.

Emerging trends in drug discovery have further positioned 3,5-Dichlorobenzenesulfonyl chloride as a key player in the development of targeted therapies. A 2024 review in Drug Discovery Today highlighted its role in the synthesis of prodrugs designed for improved bioavailability and reduced toxicity. This application reflects the compound's potential to enhance the efficacy of therapeutic agents through smart chemical design.

Despite its widespread use, challenges remain in optimizing its synthetic utility. Researchers are exploring novel catalytic systems to enhance its reactivity while minimizing byproduct formation. A 2023 study in Catalysis Science & Technology reported the successful use of metal-organic frameworks (MOFs) to improve the efficiency of reactions involving CAS No. 705-21-5, demonstrating the compound's adaptability to advanced catalytic technologies.

As the demand for innovative chemical solutions grows, 3,5-Dichlorobenzenesulfonyl chloride continues to play a pivotal role in both academic research and industrial applications. Its structural versatility, combined with recent advancements in synthetic methodologies, ensures its relevance in the development of next-generation materials and pharmaceuticals. The compound's journey from a traditional reagent to a multifunctional platform illustrates the dynamic nature of chemical innovation in modern science.

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