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Description
TCI D3788 2,3-Diaminotoluene, listed under CAS number 2687-25-4, is an aromatic diamine that carries two adjacent amino groups on a toluene ring. The compound is classified as a non-heterocyclic building block and serves as a classic starting material for the construction of nitrogen-containing heterocycles. The ortho relationship between its two amino groups is the defining feature: the neighbouring amine pair can condense with aldehydes, carboxylic acids, or 1,2-dicarbonyl compounds to close a new ring, which is why this material is frequently the entry point for benzimidazole and quinoxaline synthesis in research laboratories.
The properties that make this compound a preferred choice are the high reactivity of its aromatic amine groups combined with the ortho-diamine geometry that is ideally suited to cyclisation. The methyl group on the ring exerts a weakly electron-donating influence and gives rise to unsymmetrically substituted products, so researchers can prepare analogues with a more varied substitution pattern. It should be noted that aromatic diamines are prone to oxidation by air and light, and their colour may darken over time; this characteristic is precisely what determines how the material must be stored. That same reactivity also makes the compound useful in wider synthetic work.
In Indonesian laboratories, this building block is typically used in university and institutional research groups working on heterocyclic synthesis, medicinal chemistry scaffolds, and materials-oriented organic chemistry. It is normally handled in small-scale synthetic work where a defined ortho-diamine precursor is needed for ring-closure reactions, and it is kept alongside other reactive amine intermediates in a controlled chemical store so that its sensitivity to air and light can be managed as part of routine laboratory practice.
Laboratory Applications
Benzimidazole synthesis: the adjacent amino pair condenses directly with aldehydes or carboxylic acids to close the imidazole ring on the aromatic core.
Quinoxaline synthesis: reaction with 1,2-dicarbonyl compounds allows the ortho-diamine to form the fused six-membered nitrogen ring in a single condensation step.
Nitrogen heterocycle building block work: the compound acts as a classic non-heterocyclic precursor from which a range of nitrogenous ring systems can be assembled.
Preparation of unsymmetrical analogues: the ring methyl group produces asymmetrically substituted products, letting researchers access more diverse substitution patterns from one precursor.
General aromatic amine chemistry: the high reactivity of the two aromatic amine groups makes the material useful in broader synthetic transformations involving amine functionality.
Specifications
Brand: TCI
CAS number: 2687-25-4
Chemical name: 2,3-Diaminotoluene (product code D3788)
Category: Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
Pack sizes: please refer to the available packaging options listed for this catalogue item
Storage note: store protected from air and light, as aromatic diamines may darken over time
Handling and Storage
Because aromatic diamines are readily oxidised by air and light, this material should be kept in a tightly closed original container, protected from light, and stored in a cool, well-ventilated chemical store away from oxidising agents. Amber or otherwise light-shielded containers are appropriate, and headspace exposure should be minimised by closing the container promptly after each use. Any darkening of colour on storage reflects this oxidation sensitivity. Handle the compound in a fume hood using gloves, safety glasses, and a laboratory coat, avoid inhalation of dust and skin contact, and follow the manufacturer's safety data sheet together with local institutional waste-disposal procedures.
