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Description
TCI D4062 4,5-Dibromo-1,2-phenylenediamine is a non-heterocyclic building block that carries two neighbouring amino groups on a benzene ring together with two bromine atoms at the 4- and 5-positions. This combination of functional groups makes it one of the most productive starting materials in heterocyclic synthesis. In the laboratory, the compound is routinely used to construct five- and six-membered nitrogen-containing rings through condensation reactions, while at the same time leaving the two bromine atoms in place as connection points that can be exploited in later synthetic steps.
The property that makes this material so highly valued is its dual reactivity pattern. The pair of ortho amino groups reacts with carboxylic acids, aldehydes, or 1,2-dicarbonyl compounds to form benzimidazoles and quinoxalines, while reaction with sulfur or selenium sources gives the electron-accepting units that are so important in organic electronics. On the other hand, the two bromine atoms that remain intact after condensation serve as direct handles for cross-coupling reactions such as Suzuki, Stille, and Sonogashira. A single starting material can therefore carry a researcher from a simple ring all the way to a complex conjugated molecule.
In Indonesian laboratories, this building block is typically found in university and institutional research groups working on organic synthesis, materials chemistry, and medicinal chemistry. It is used at the bench scale for exploratory route development, for preparing heterocyclic intermediates that are later elaborated by coupling chemistry, and in postgraduate research projects. Because it supports several distinct reaction families from one bottle, it is a practical choice for groups that need synthetic flexibility from a limited inventory of reagents.
Laboratory Applications
- Benzimidazole synthesis — the ortho-diamine pair condenses cleanly with carboxylic acids or aldehydes to build the benzimidazole core while both bromine substituents remain available for later functionalisation.
- Quinoxaline preparation — reaction with 1,2-dicarbonyl compounds delivers dibrominated quinoxalines in a single condensation step, giving direct access to six-membered nitrogen heterocycles for further elaboration.
- Electron-accepting unit construction — treatment with sulfur or selenium sources converts the diamine into acceptor units of the type widely used in organic electronics research and conjugated materials development.
- Suzuki and Stille cross-coupling substrates — the two intact bromine atoms act as reliable handles for palladium-catalysed carbon–carbon bond formation, extending simple rings into larger conjugated frameworks.
- Sonogashira coupling and conjugated molecule assembly — the dibromo pattern allows alkynyl groups to be installed at defined positions, supporting the stepwise construction of extended π-conjugated target molecules.
Specifications
- Brand: TCI (Tokyo Chemical Industry)
- CAS number: 49764-63-8
- Chemical name: 4,5-Dibromo-1,2-phenylenediamine
- Category: Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
- Pack sizes: supplied in standard TCI research-scale catalogue pack sizes; please confirm the available packaging when ordering.
- Storage note: store in a tightly closed container in a cool, dark, well-ventilated place, in accordance with the manufacturer's product documentation.
Handling and Storage
Keep the container tightly closed and store it in a cool, dark, well-ventilated area away from heat, direct sunlight, and incompatible materials. Aromatic diamines are generally sensitive to air and light, so the original manufacturer packaging, or an equivalent tightly sealed amber glass container, is the most suitable storage option. Handle the material inside a fume hood using gloves, safety glasses, and a laboratory coat, and avoid the generation and inhalation of dust during weighing and transfer. Use clean, dry spatulas to prevent contamination of the bulk material, reseal the container immediately after use, and always consult the manufacturer's Safety Data Sheet before handling or disposal.
