TCI D2709 3,5-Diamino-2,4,6-trimethylbenzenesulfonic Acid is an aromatic compound that carries two amino groups, three methyl groups, and one sulfonic acid group on a single benzene ring. This combination of functional groups makes it a valuable non-heterocyclic building block, particularly as a diamine monomer that already carries a sulfonate group from the outset. In the laboratory, a material of this kind is used to construct polymers or target molecules that need hydrophilic character and proton-conducting capability without having to pass through an additional sulfonation step, a stage that is often difficult to control.
The characteristics that lead researchers to select this compound begin with its two amino groups, which are reactive toward acyl groups, anhydrides, and carboxylic acid derivatives, making the material well suited to the formation of amide and imide bonds. The sulfonic acid group imparts strongly acidic behaviour and high polarity, which in turn influences solubility in aqueous media as well as in polar solvents. The three methyl groups positioned between the functional groups provide steric hindrance that regulates the arrangement of polymer chains, so the chains do not pack too tightly and the processing properties of the material improve.
This neatly ordered substitution pattern is rarely encountered on comparable monomers, which is why the compound occupies a specific place in laboratory work rather than serving as a general-purpose reagent. In Indonesian laboratories, it is typically ordered by university and institutional research groups working on polymer synthesis and functional materials, where a pre-sulfonated diamine shortens the synthetic route. It is handled as a research-scale building block, weighed out in small quantities for stepwise synthesis and characterisation work.
Related TCI products
- TCI A2552 6973-09-7 5-Amino-2-methylbenzenesulfonamide
- TCI A0896 6627-59-4 Sodium 2-Amino-4-chloro-5-methylbenzenesulfonate
- TCI T1485 4124-41-8 p-Toluenesulfonic Anhydride
- TCI B3408 98-11-3 Benzenesulfonic Acid Anhydrous
- TCI B1931 512-35-6 Benzenesulfonic Anhydride
- TCI B0030 26158-00-9 Benzenesulfonic Acid Monohydrate
- Sulfonated polyamide synthesis: the two amino groups react readily with acid chlorides and anhydrides, so the sulfonate is built into the backbone directly during polycondensation.
- Sulfonated polyimide preparation: as a diamine monomer it forms imide linkages with dianhydrides while the sulfonic acid group contributes the ionic functionality needed in the finished chain.
- Proton-conducting membrane research: the built-in sulfonic acid group provides proton transport capability without a separate post-sulfonation treatment that is often hard to control.
- Hydrophilic functional material development: the high polarity of the sulfonic acid group improves interaction with aqueous media and polar solvents in the resulting polymer or target molecule.
- Controlled chain-packing studies: the three methyl groups create steric hindrance that loosens chain arrangement, allowing researchers to study and improve material processing behaviour.
| Brand | TCI |
|---|---|
| CAS number | 32432-55-6 |
| Molecular formula | — |
| Purity | — |
| Category | Chemistry > Building Blocks > Non-Heterocyclic Building Blocks |
| Pack sizes | available in research-scale catalogue pack sizes; please confirm the currently listed options when ordering |
| Physical form | — |
| Storage | keep in the tightly closed original container, protected from moisture |
- Chemical name: 3,5-Diamino-2,4,6-trimethylbenzenesulfonic Acid
- Catalogue code: D2709
Store the material in its original tightly closed container in a cool, dry, well-ventilated area, away from moisture and from incompatible materials such as strong bases and strong oxidising agents. The sulfonic acid group makes the compound hygroscopic in character and strongly acidic, so containers should be resealed promptly after each use and stored on a chemically resistant surface or in a dedicated acid cabinet. Handle in a fume hood using safety glasses, gloves, and a laboratory coat, and avoid generating dust when weighing out portions. Because the amino groups are reactive, transfer with clean dry spatulas and glassware, and consult the supplier safety data sheet before first use.
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