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HS Code |
374870 |
| Chemical Name | 3-Nitrobenzenesulfonyl Chloride |
| Cas Number | 636-73-7 |
| Molecular Formula | C6H4ClNO4S |
| Molecular Weight | 221.62 |
| Appearance | Pale yellow to light brown crystalline solid |
| Melting Point | 90-94°C |
| Boiling Point | Decomposes before boiling |
| Solubility In Water | Reacts with water |
| Density | 1.63 g/cm³ |
| Purity | Typically ≥98% |
| Storage Conditions | Store in cool, dry place, tightly sealed, under inert atmosphere |
| Hazard Statements | Corrosive, causes burns, harmful if inhaled |
As an accredited 3-Nitrobenzenesulfonyl Chloride factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 250g of 3-Nitrobenzenesulfonyl Chloride is packaged in a tightly sealed amber glass bottle, labeled with hazard and handling information. |
| Shipping | 3-Nitrobenzenesulfonyl Chloride is shipped in tightly sealed containers, typically under inert atmosphere to prevent moisture contact. Store and transport in cool, dry, and well-ventilated conditions. Handle as a corrosive and irritant substance, following all applicable regulations for hazardous chemicals. Appropriate hazard labeling and documentation are required during shipping. |
| Storage | 3-Nitrobenzenesulfonyl chloride should be stored in a cool, dry, and well-ventilated area, away from moisture, heat, and sources of ignition. Keep the container tightly closed and protected from direct sunlight. Store separately from bases, acids, alcohols, and oxidizing agents. Use appropriate chemical storage cabinets and ensure proper labeling to prevent accidental mixing with incompatible substances. |
Applications of 3-Nitrobenzenesulfonyl Chloride in Industrial Manufacturing3-Nitrobenzenesulfonyl chloride serves as a critical intermediate and functional reagent in several specialty chemical industries. Our direct supply to manufacturing partners has enabled its precise integration into demanding applications that rely on strict formulation control, regulatory compliance, and detailed process engineering. Below, we outline key downstream application scenarios where our material delivers specific value and performance according to each sector’s production protocols and finished product requirements.
Pharmaceutical contract manufacturers and vertically integrated API producers employ this compound as a sulfonylating agent for introducing protected sulfonamide groups during the synthesis of sulfa drugs and related active pharmaceutical ingredients. The selection of this intermediate facilitates stepwise functional group protection, providing high selectivity in complex multi-stage organic transformations, including molecules possessing electron-rich aromatic systems or reactive amine moieties. Industry compliance standards
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2. Agrochemical Intermediate SynthesisMajor agrochemical producers utilize this material in the synthesis of active herbicidal and fungicidal compounds. Its reliable sulfonylation reactivity enables selective derivatization of precursor molecules, streamlining the production of bioactive sulfonylurea and sulfonamide ingredients in crop protection agents, where precise control over impurity profiles and batch-to-batch consistency is critical for field use registration. Industry compliance standards
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3. Dye and Pigment ManufacturingProducers of specialty azo and anthraquinone dyes employ this chloride as a coupling and modifying agent for the structural functionalization of aromatic amines. The introduction of a nitrobenzenesulfonyl group enhances resistance to light and washing, produces deeper colors, and imparts desirable solubility in textile coloration systems, allowing precise adjustment of reactive or acid dye molecular architectures for demanding industrial printing operations. Industry compliance standards
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4. Synthesis of Protecting Groups for Organic SynthesisMany fine chemical and contract synthesis laboratories rely on this compound to install o-nitrobenzenesulfonyl (Ns) protecting groups on primary and secondary amines. Its selective reactivity and facile deprotection under mild reducing conditions support multistep custom syntheses, improving purity levels and lowering waste byproducts in the construction of complex organics. Industry compliance standards
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5. Photographic Chemical ManufacturingManufacturers of high-end photographic chemicals and imaging materials apply this molecule as a controlled-component in the synthesis of light-sensitive sulfonamide-containing agents. Its introduction stabilizes silver halide emulsions, increases the storage stability of developers, and fine-tunes the dynamic range and granularity required for professional imaging and radiographic films. Industry compliance standards
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6. Specialty Polymer ModificationEngineering polymer producers use this sulfonyl chloride for introducing sulfonamide, nitro, or aryl groups to tailor-make specialty copolymers. Its precise reaction profile allows for tuning polymer solubility, thermal characteristics, and surface functionality, especially for high-performance engineering films and membranes employed in electronics and filtration applications. Industry compliance standards
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As a chemical manufacturer, our benchmarks for every batch of 3-Nitrobenzenesulfonyl Chloride start at the ground level. We have watched the transition of chemical production from simple, small-scale setups to today’s tightly regulated, high-capacity environments. Improving both purity and safety sits at the center of every step here, because chemists downstream rely on our consistency.
We synthesize this product—commonly known in industry shorthand as NBsCl or 3-NBSC—from nitrobenzene sulfonic acid derivatives and controlled chlorination. Years spent perfecting reaction parameters, coupling proper chilling, and selecting optimum solvent systems have allowed us to minimize common byproducts like sulfonic acid residuals and polychlorinated fragments. Our final product is a light yellow crystalline powder which holds its structural integrity during handling and storage, not just at the time of shipping, but months after landing on the benches of pharmaceuticals, dyes, and fine chemical houses.
With feedback from experienced researchers and process chemists, our standard model for 3-Nitrobenzenesulfonyl Chloride consistently features purity up to 99%. The melting point usually falls between 77°C and 81°C, and careful attention to moisture content avoids unpredictable reactivity. Chloride content and sulfonic purity are measured against both internal benchmarks and external analytical requirements—using HPLC, GC, and titration, rather than relying solely on spot-tests. Impurity fingerprints are tracked from raw material intake to final package, allowing us to act quickly if a shift in quality shows up anywhere. This approach isn’t just box-ticking. Subtle contaminants can cause expensive delays for our partners, particularly those building high-value products.
Packaging methods take into account both the reactivity and physical properties of 3-Nitrobenzenesulfonyl Chloride. Moisture-proof liners and nitrogen purges ensure no clumping or hydrolysis during transit. Over time, we found that slightly finer sieving reduces bridging and improves handling, especially in automated dispensing lines. We avoid unnecessary additives, so the purity remains uncompromised as soon as customers break the seals.
We’ve observed a steady rise in demand for sulfonyl chlorides, particularly 3-Nitrobenzenesulfonyl Chloride, thanks to its value in selective acylation, amine protection, and sulfonamide syntheses. Medicinal chemists repeatedly ask for tight batch-to-batch reproducibility because minor differences cascade into costly validation delays. Our product regularly features in the synthesis of advanced pharmaceutical intermediates, where the nitro group’s electron-withdrawing effects and ortho-para directing tendencies drive regioselective reactions.
For dye makers, this compound opens up scaffolds for multiple classes of colorants—azo, anthraquinone, and sulfur dyes—by introducing a robust, reactive sulfonyl group ready for coupling. Our experience supplying both pilot and plant-scale manufacturers tells us that these industries rarely tolerate unreliable supply. Delays mean lost revenue, so we keep buffer stocks and rapid QA processes—lessons learned the hard way in working with partners on strict delivery windows.
In specialty chemistry fields—such as photographic agents or performance polymers—3-Nitrobenzenesulfonyl Chloride enables the introduction of strong electron-withdrawing groups onto aromatic rings. These substitutions underpin niche product lines with global reputations for reliability. Even in application areas where large multinationals dominate, a smooth supply chain for core building blocks isn’t an afterthought. We field regular queries about stability data, residue handling, and batch repeatability, validating our role behind so many downstream successes.
Sticking close to the plant, we’ve seen requests for sulfonyl chlorides span a wide range, from the classical p-toluenesulfonyl chloride (tosyl chloride) to para- and ortho-nitrobenzenesulfonyl analogues. Each variant brings distinct reactivity profiles, safety considerations, and cost implications. Our regular technical discussions with end users reveal the most compelling advantage of the 3-nitro isomer: its nitro group’s balancing act between reactivity and stability in typical synthesis conditions. Para isomers may offer lower steric hindrance, but the 3-nitro variant walks a fine line, providing enhanced reactivity without unpredictable side reactions. Too much reactivity, and handlers face safety concerns or product deterioration; too sluggish, and yields drop. Striking the right balance is more than theoretical: it shapes the cost of synthesis and the scale of industrial projects.
By working directly with process chemists in-house and in customer teams, we see practical differences in purification and downstream transformations. Several customers have shifted from p-toluenesulfonyl to 3-nitrobenzenesulfonyl options to crack difficult purification challenges linked to unwanted byproducts. Their reason—improved selectivity and milder work-up conditions—reflects trends toward greener, less resource-intensive processes.
The market for specialized intermediates has moved far beyond basic quality claims and generic COAs. Years ago, simple proof of melting point or purity was enough. Now, requests for detailed impurity profiles, extended shelf-life studies, and compliance with evolving regulatory checklists dominate our daily work. Our ongoing investments extend into analytical infrastructure, so requests for NMR, LC-MS, and trace residue analyses do not slow anyone down. In projects requiring regulatory filings, we keep audit-friendly records, simplifying the path for our customers to meet the standards imposed by US, EU, and Asian authorities.
We engage with quality oversight bodies and gather direct feedback from key compliance officers entrusted with project-critical information. This practice does more than just tick boxes; it feeds back into process improvements, tighter quality windows, and fewer surprises at the end of a project. Several of our long-term partners have pointed out that our data transparency gave them the edge in submitting new filings, especially where questions about process impurities or stability data arose late in development. Putting the manufacturing story—and supporting evidence—on the table removes obstacles in high-value project launches.
Running a chemical plant centered on specialty sulfonyl chlorides means we manage both acute and chronic hazards. 3-Nitrobenzenesulfonyl Chloride can trigger severe irritation and needs rigorous containment. Over time, the environmental and health risks linked to chlorinated intermediates led us to overhaul ventilation, filtration, and liquid waste systems. Recycling chlorine streams, minimizing run-off, and switching to closed-loop bulk handling helps us meet national and international safety regulations.
Instead of framing sustainability as an afterthought, we embed risk mitigation in every process design step. We have replaced older open-vat chlorination with continuous reactors equipped for real-time monitoring, cutting vent losses by over half across three years of upgrades. This sort of operational change delivers cleaner air inside the plant, but also allows for data-supported reductions in environmental reports. Many clients have noticed fewer batch-to-batch inconsistencies as a result—variability often tied to older, less controlled methods.
We keep safety at the forefront for our team as much as for customers. Detailed safety training, robust SOPs, and personal protective gear guard against both accidental exposure and long-term health risks. Investing in this infrastructure protects experienced staff—and their deep process knowledge—from avoidable turnover due to safety lapses. Our environmental compliance logs, maintained for audit readiness, not only satisfy regulators but also reinforce trust among supply chain partners and end-users alike.
Interactions with experienced users often raise new application needs or wish lists for improved physical properties. One partner required finer particle size for precision dispensing in automated systems; a researcher group asked for detailed impurity mapping ahead of scaling a novel drug intermediate. By collaborating directly, we adapted process controls, monitored additional analytical markers, and achieved a supply format that shortened their development timelines.
We do not keep our improvements under wraps. Any gains in production efficiency, reduction in energy usage, or enhancement in analytical protocols roll out plant-wide. This feedback loop, informed by the chemists who apply our products under real-world constraints, means every new batch is just a little more user-friendly and reliable than the last. Regular site visits from QA staff and technical guides help us translate the experience from one industry—like photographic chemistry—into actionable changes for another, such as advanced drug synthesis. This approach keeps development costs contained while opening new conversations about innovation at scale.
Straight from the production line, 3-Nitrobenzenesulfonyl Chloride stands out as a trusted core building block for industries where precision, purity, and reliability are not optional luxuries. Whether destined for a kilogram-scale pharmaceutical intermediate run or a continual feed into specialty dye synthesis, each batch is underpinned by decades of manufacturing expertise and rigorously vetted analytics. What sets this product apart isn’t one stand-alone feature, but the synergy between high-purity material, repeatable process controls, and open technical dialogue with our partners.
Over the years, we have seen the requirements for consistency and regulatory transparency intensify. We responded by investing not just in bigger reactors but in better ways of measuring, tracking, and documenting every aspect of the product’s journey from raw material to finished package. Working closely with users, tweaking specs, and adapting to evolving expectations, has allowed us to keep pace with new applications and more complex synthetic routes.
As the landscape for chemical manufacturing continues to evolve—shaped by shifting regulations, demands for cleaner production, and pressure for traceability—we commit ourselves to providing a product that outpaces simple compliance. By rooting our practice in careful process management and open technical communication, 3-Nitrobenzenesulfonyl Chloride remains not just another reagent on a shelf, but a workhorse for those pushing boundaries in science and industry.
