5-Bromoacenaphthenequinone: Properties, Uses & FAQs

5-Bromoacenaphthenequinone is a brominated polycyclic aromatic 1,2-diketone derived from acenaphthylene, widely used as a reactive intermediate in organic synthesis and materials science research.

Chemical Name

5-Bromoacenaphthenequinone

Core Scaffold

Acenaphthylene-based fused bicyclic 1,2-diketone

Functional Groups

1,2-diketone (alpha-diketone) and aryl bromide

Primary Application

Intermediate in synthesis of heterocyclic compounds, ligands and dyes

Aladdin SKU

B770053

Reactivity Features

Electrophilic diketone amenable to condensation, cycloaddition and metal-coordination reactions

What Is 5-Bromoacenaphthenequinone?

5-Bromoacenaphthenequinone is a halogenated derivative of acenaphthenequinone, a polycyclic aromatic 1,2-diketone. Its structure consists of a naphthalene ring system fused with a five-membered ring bearing two adjacent carbonyl groups (C=O) at the 1- and 2-positions, with a bromine substituent at the 5-position of the aromatic framework.

The coplanar, rigid architecture of the acenaphthylene scaffold combined with the electron-withdrawing 1,2-diketone unit and the halogen substituent makes this compound a versatile building block in synthetic chemistry. The bromine atom enables further functionalization via cross-coupling reactions (e.g., Suzuki, Sonogashira), while the 1,2-diketone moiety participates readily in condensation reactions with 1,2-diamines to form phenanthrolineimidazole-type ligands and related heterocycles.

Key Chemical Properties and Handling

Appearance: 5-Bromoacenaphthenequinone is typically obtained as a yellow to orange crystalline solid, consistent with the strong visible-light absorption characteristic of conjugated alpha-diketones.

Solubility: The compound is generally soluble in common organic solvents such as dichloromethane, chloroform, dimethylformamide (DMF) and dimethyl sulfoxide (DMSO), and has limited solubility in water due to its hydrophobic polycyclic aromatic character.

Stability: Store in a cool, dry place away from strong light, moisture and incompatible oxidising or reducing agents. As with other alpha-diketones and aryl bromides, standard laboratory precautions apply: use appropriate personal protective equipment (PPE) including gloves, safety glasses and a lab coat. Consult the Safety Data Sheet (SDS) before use.

Reactivity: The 1,2-diketone is electrophilic and reacts with nucleophiles including amines and hydrazines. The aryl bromide is susceptible to palladium-catalysed cross-coupling. Avoid prolonged exposure to strong bases or reducing agents.

Applications in Research and Synthesis

5-Bromoacenaphthenequinone serves multiple roles across different research disciplines:

• Heterocyclic synthesis: Condensation with ortho-phenylenediamine or related 1,2-diamines yields imidazophenanthroline-type and quinoxaline-type fused heterocycles that are useful as fluorescent probes, pharmaceutical scaffolds and coordination ligands.
• Coordination chemistry: The 1,2-diketone unit forms stable chelate complexes with transition metals (e.g., Ru, Ir, Cu, Zn), making the compound a precursor to luminescent metal complexes for photocatalysis and bio-imaging applications.
• Cross-coupling chemistry: The 5-bromo substituent acts as a handle for Pd-catalysed Suzuki–Miyaura, Sonogashira and Buchwald–Hartwig reactions to introduce aryl, alkynyl or amino groups, enabling access to extended pi-conjugated systems for organic electronics and dye applications.
• Materials science: Extended conjugated derivatives of acenaphthenequinone are of interest as n-type organic semiconductors and components of donor–acceptor architectures in organic photovoltaics.

Ordering and Product Information

5-Bromoacenaphthenequinone is available from Aladdin Scientific under SKU B770053. When placing an order, please note the following:

• Purity and grade: Please refer to the current Certificate of Analysis (CoA) available on the product page for the specific lot purity, melting point and spectroscopic data. Contact our technical support team if you require a custom purity grade or larger quantities.
• Packaging: Standard pack sizes are listed on the product detail page. Custom quantities may be available upon request.
• Shipping: The compound is shipped as a solid at ambient temperature under standard chemical shipping conditions. Ensure your institution's receiving procedures comply with applicable chemical import regulations.
• Documentation: SDS, CoA and structural confirmation data (e.g., NMR, HPLC) are available for download from the product page or upon request from our customer service team.

Frequently asked questions

What is 5-Bromoacenaphthenequinone used for in organic synthesis?

5-Bromoacenaphthenequinone is primarily used as a bifunctional building block. Its 1,2-diketone reacts with 1,2-diamines to form fused heterocyclic scaffolds such as quinoxalines and imidazophenanthrolines, while the 5-bromo substituent allows Pd-catalysed cross-coupling (Suzuki, Sonogashira) to install additional functional groups. This dual reactivity makes it valuable for constructing extended pi-systems for coordination chemistry, photocatalysis and organic materials applications.

What solvents are suitable for dissolving 5-Bromoacenaphthenequinone?

5-Bromoacenaphthenequinone is generally soluble in polar aprotic organic solvents such as DMF, DMSO and chlorinated solvents like dichloromethane and chloroform. It has limited solubility in water and in non-polar solvents like hexane. For reactions requiring aqueous conditions, a co-solvent system is recommended.

How should 5-Bromoacenaphthenequinone be stored to maintain stability?

The compound should be stored in a tightly sealed container in a cool, dry location away from direct light and moisture. Standard storage at room temperature or under refrigeration (2–8 °C) in an inert atmosphere (e.g., under argon or nitrogen) is advisable for long-term preservation. Always consult the SDS for detailed storage and disposal instructions.

Is 5-Bromoacenaphthenequinone the same compound as the McLean catalogue entry B932013?

The source material references McLean (麦克林) catalogue number B932013 alongside this compound. However, Aladdin Scientific lists 5-Bromoacenaphthenequinone under SKU B770053. If you are uncertain whether two catalogue entries from different suppliers refer to identical material and purity grades, please request the respective Certificates of Analysis and compare CAS numbers, purity and spectroscopic data, or contact our customer service team for clarification.

Can 5-Bromoacenaphthenequinone be used to synthesise metal coordination complexes?

Yes. The 1,2-diketone moiety of 5-Bromoacenaphthenequinone can coordinate to transition metals and also serve as a precursor for polydentate ligands when condensed with diamines. Resultant ligands have been explored in complexes with metals such as ruthenium, iridium and copper for luminescence and photocatalytic applications. Specific reaction conditions will depend on the target metal and ligand design; consult primary literature for optimised protocols.

References

1. Aladdin Scientific product page: 5-Bromoacenaphthenequinone, SKU B770053.
2. General reference: March's Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 7th ed. – alpha-diketone reactivity and condensation chemistry.
3. General reference: Joule, J. A.; Mills, K. Heterocyclic Chemistry, 5th ed. – synthesis of quinoxalines and phenanthrolineimidazoles from 1,2-diketones.

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