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Working in organic chemistry over the years, one comes to appreciate molecules that serve as both reliable building blocks and sources of new potential. Among these, 4'-Bromo-3'-Methylacetanilide draws attention for its ability to bridge multiple useful chemical features in a single structure. By combining a bromo group at the para position and a methyl substituent ortho to the acetanilide core, this compound holds advantages not offered by simpler or less densely substituted analogs. Chemists lean on it for its ready reactivity, its pattern of substitution, and the way these properties shape outcomes across a crowd of research and production scenarios.
Choosing 4'-Bromo-3'-Methylacetanilide means using a molecule with a specific identity: C9H10BrNO. At the molecular level, every atom counts. The para bromo substituent brings a strong electron-withdrawing effect, reshaping the compound’s interaction with reagents and catalysts. Coupled with a meta methyl group, the molecule picks up a subtle shift in steric bulk that steers reaction selectivity, often yielding products hard to access from simpler acetanilide cousins. It arrives as a crystalline solid, typically white to pale off-white, with a melting point that offers quick verification of purity in the lab. Its standard molecular weight sits at 228.09 g/mol.
For those involved in analytical work, 4'-Bromo-3'-Methylacetanilide’s structure can be confirmed by common methods: proton and carbon NMR spectra produce easily assigned peaks due to the substitution pattern, while infrared spectroscopy reveals amide carbonyl stretches and typical aromatic absorptions. High-performance liquid chromatography (HPLC) separates it cleanly, supporting purity assessments in demanding settings.
Every synthetic chemist remembers the search for better intermediates—structures that open new transformations without unnecessary bottlenecks. 4'-Bromo-3'-Methylacetanilide serves that role in both discovery and process settings. In cross-coupling chemistry, few functional groups beat the reactivity of a para-brominated aromatic system. Suzuki and Buchwald-Hartwig coupling protocols use this motif as a springboard for attaching complex aryl or amine fragments. The methyl group, meanwhile, tweaks electron density and guides selectivity, offering chemists ways to control regioisomer formation in further modifications.
Beyond its synthetic versatility, this compound supports medicinal chemistry campaigns as a starting point or intermediate for designing new analgesic, antipyretic, or anti-inflammatory agents. Researchers have found that modifications at the aromatic ring, especially involving halogens and alkyl groups, play a role in tuning both biological activity and pharmacokinetic profile. While no single building block guarantees a blockbuster drug, the structure of 4'-Bromo-3'-Methylacetanilide answers the recurring need for modular diversification during early-stage lead optimization.
Working with this molecule over the years, one learns to appreciate how small changes in aromatic substitution echo through downstream processes. The bromo group not only activates the ring for cross-couplings, but also provides a handle for further halogen exchange chemistry. Many colleagues have built libraries of substituted anilides simply by using this substrate and exploring different reactions—nitrations, alkylations, or cyclizations—available due to its dual substituent pattern.
Chemical catalogs are filled with hundreds of acetanilide derivatives, so it’s fair to ask how this compound really stands apart. Classic acetanilide, lacking halogen or alkyl groups, offers little in the way of strategic reactivity—its plain structure limits the transformations available. Switch to para-bromoacetanilide and you’ve added activation for couplings, but miss out on the selectivity adjustments possible with a second group. Compare also with ortho-methylacetanilide; here, the steric hindrance influences site-selectivity but does not offer a ready site for cross-coupling. 4'-Bromo-3'-Methylacetanilide provides the benefits of both: bromo for modern cross-couplings and methyl for tuning activity or selectivity.
In day-to-day research, the methyl group at the 3' position blocks certain reactive sites, helping guide reactive intermediates toward desired products, especially in multi-step syntheses. This becomes crucial when building structurally complicated targets where controlling each transformation matters. Some colleagues recall failed attempts using simpler anilides, finally achieving target molecules on switching to this dual-substituted version. Small changes like this often spell the difference between a stalled project and a productive campaign.
Other brominated or methylated anilides can sometimes serve similar roles but do not offer the same balance of reactivity and selectivity. For instance, meta-bromo analogs lack the cross-coupling efficiency of the para isomer, and products with larger alkyl groups see more steric hindrance and purification headaches. 4'-Bromo-3'-Methylacetanilide avoids these drawbacks, featuring a sweet spot for scale-up or discovery settings.
Every product can only be as useful as the safety and practicality allow. Over years of handling aromatic amides, I’ve learned that proper storage and routine caution pay off. 4'-Bromo-3'-Methylacetanilide handles well when kept dry and in well-sealed containers. Its solid nature protects it from accidental spills, and its relatively low volatility means fewer concerns with inhalation compared to vaporizable reagents. Like with all acetanilide derivatives, gloves and standard lab attire keep exposure low, and any weighing or transfer benefits from a clean, dry spatula.
Colleagues have raised questions about the stability of bromoaromatics over time. In my experience, this compound maintains its integrity well if protected from light and excess heat. Desiccators or dry cabinets offer extra reassurance, and regular checks using melting point or TLC can flag any unexplained decomposition. Disposal of unused material follows standard organic waste protocols; it’s always worth consulting up-to-date guidelines for halogenated organics.
Beyond academic exploration, 4'-Bromo-3'-Methylacetanilide has a growing role in more applied sectors. Pharmaceutical developers value its ease of transformation when rapidly generating analogs—especially in structure-activity relationship studies. The molecule’s ready reactivity enables short, high-yield synthetic sequences, cutting down on both time and reagent costs. For contract research organizations (CROs), reliability in takedown and scalability is equally prized.
In agrochemical research, aromatic amides resemble core fragments in herbicides and fungicides. The unique substitution pattern of 4'-Bromo-3'-Methylacetanilide helps mimic or modify biologically active frameworks observed in nature. Research teams exploring new application fields—from dyes to advanced materials—find value in having a substrate that supports broad derivatization while keeping purification and characterization straightforward.
In one project, we aimed to extend an established drug scaffold by adding substituents via palladium-catalyzed couplings. Other brominated acetanilides suffered from selectivity or side reactions, but the methyl group here limited unwanted pathways, yielding cleaner products. Lessons like these highlight the non-obvious value locked in a carefully chosen intermediate.
The chemical structure of a molecule like 4'-Bromo-3'-Methylacetanilide sets the stage for how researchers approach challenges. Each atom and substituent nudges reactions down particular paths, influencing how easily new molecules can be made. Over long days at the bench, frustration often comes from trying to force a transformation on a stubborn substrate. Experience teaches that using the right intermediate eases headaches—saving time and improving reproducibility.
Chemists never forget failed reactions with simple acetanilides, only to watch everything click into place after switching to a better-suited analog. The lessons stick: small choices at the outset ripple through even the most complicated syntheses. Having an intermediate like this, which combines manageable handling with the flexibility of useful functional groups, makes it easier to focus labor and resources where they count.
Process chemists often see promising research undermined by poor scalability or unpredictable impurity profiles. By selecting 4'-Bromo-3'-Methylacetanilide early in route design, teams avoid common stumbling blocks caused by overly reactive or too inert intermediates. Its physical stability means fewer surprises on storage and transport, while the dual substitution pattern offers predictable outcomes in cross-couplings.
During pilot production, reliable crystallization and straightforward isolation stand out as practical benefits. Many intermediates clog filters, oil out instead of crystallizing, or demand elaborate purification. Using this compound, batches typically handle without complex steps, producing pure material suitable for further modifications. In industries where time truly is money, these features matter.
Environmental and regulatory considerations continue to evolve. As restrictions on hazardous reagents tighten, brominated aromatics sometimes draw attention. Experience shows that compared to lighter halogens or heavy metals, properly managed brominated substrates avoid many compliance headaches. The molecule’s solid, non-volatile nature supports easier containment, and conscientious companies can manage halogenated waste streams safely.
Working with this compound, several practices amplify its strengths. Starting with fresh, high-purity batches lowers the risk of stubborn side reactions and purification headaches down the road. For coupling chemistry, careful choice of catalysts and bases lets both the bromo and methyl substituents do their jobs—steering reactivity and selectivity in the desired direction. Recrystallization from ethanol or ethyl acetate delivers analytical-grade material.
For those in medicinal chemistry, parallel synthesis on the acetanilide core becomes straightforward. Using 4'-Bromo-3'-Methylacetanilide as a launching pad, researchers benefit from predictable transformations—halogen exchange, organometallic additions, nucleophilic aromatic substitutions, or reduction to corresponding anilines. Careful monitoring of each step pays dividends in better yields and traceable impurity profiles, both of which smooth the path toward scale-up.
Cross-functional teams also gain by pooling synthetic, analytical, and safety insights at route planning meetings. In settings where mistakes can set a project back weeks, relying on a robust, well-understood intermediate like this helps keep things on track.
Peer-reviewed chemistry literature confirms the value of this kind of aromatic amide as a substrate for cross-coupling and as a point of entry to more complex structures. Academic and industrial teams continue to publish examples where para-bromo and meta-methyl substitution patterns improve selectivity or boost pharmacological performance. Its role in diversifying drug candidates and streamlining discovery has been noted in journals specializing in synthetic methodology, medicinal chemistry, and process development.
Research case studies document higher yields and more manageable reaction profiles in key coupling steps, compared against analogs lacking methyl groups. Toxicological assessments show that, as with most aromatic amides, exposures can be managed safely with conventional lab protocol. No widespread reports of chronic hazards have emerged, and the bromo group's presence does not raise red flags when contained and disposed responsibly.
Manufacturers routinely adopt this intermediate for both its synthetic appeal and practical ease. In forums covering process optimization, chemists cite lower troubleshooting time and improved reproducibility over unmodified acetanilides. My own group has seen projects move from milligram to kilogram scale without major reinvention of safety or purification workflows.
The chemical industry shifts constantly to balance new promise and responsible use. As sustainability targets rise, intermediates that enable cleaner, more efficient syntheses become even more valuable. 4'-Bromo-3'-Methylacetanilide lines up with this shift for several reasons: fewer steps mean less waste, robust isolation keeps loss at bay, and cross-coupling using modern palladium catalysis often reduces reliance on harsher reagents.
Where possible, process improvements can center on greener solvents, reduced catalyst loading, or telescoped steps that build on the compound’s inherent stability. Some labs now recycle byproducts or minimize excess reagents—easier to do with an intermediate whose clean reactivity and manageable properties stay consistent even as batch sizes grow.
Standardization of safety and waste handling routines supports regulatory compliance. With the shift toward greener chemistry, teams who know their intermediates—and who see value in robust, versatile products—stand ready to adapt ahead of regulatory or market surprises.
Years spent at the bench and in process scale-up teach that success often depends on the small, strategic choices made early in a project. 4'-Bromo-3'-Methylacetanilide offers more than the sum of its structure: as a trusted intermediate, it blends synthetic reach, ease of handling, and practical safety into one product. Its unique substitution pattern puts more tools in the chemist’s hands—helping projects move thoroughly through development, discovery, and ultimately, application. From my own work and the experience of colleagues across pharmaceutical, academic, and chemical sectors, this compound has earned its spot as more than just another acetanilide derivative.
Every project brings new challenges, but with reliable building blocks, teams work smarter, faster, and with confidence. As the research landscape continues to change, a well-chosen intermediate like this offers both continuity and new potential. Drawing from both practical results and hard-won experience, the value of 4'-Bromo-3'-Methylacetanilide stands clear—across scales, across goals, and across the continuing evolution of chemical science.
