Chemical Structure and Key Properties

2-(2,7-Dichloro-9H-fluoren-4-yl)oxirane (catalog number D193785) consists of a 9H-fluorene tricyclic aromatic scaffold substituted with chlorine atoms at the 2- and 7-positions and bearing an oxirane (epoxide) ring at the 4-position side chain. The fluorene core is a rigid, planar polycyclic aromatic system formed by two benzene rings fused to a central five-membered carbocyclic ring, providing excellent π-conjugation and structural rigidity.

The two chlorine substituents at positions 2 and 7 exert electron-withdrawing inductive and weak mesomeric effects on the aromatic system, modulating the electron density of the ring and influencing the reactivity of the appended epoxide. The epoxide (oxirane) ring is a highly strained three-membered heterocycle that is inherently electrophilic at the carbon atoms adjacent to oxygen, making it susceptible to ring-opening by a wide range of nucleophiles including amines, thiols, alcohols, and organometallic reagents.

The combination of the rigid fluorene scaffold, the electron-withdrawing chloro groups, and the reactive epoxide moiety makes this compound a multifunctional building block for advanced organic synthesis and materials science research.

Synthesis and Handling Guidelines

Synthesis context: Aryl epoxides of the fluorene series are typically accessed via epoxidation of the corresponding vinyl-substituted fluorene precursor using peracids (e.g., mCPBA) or other electrophilic oxygen-transfer reagents, or alternatively via Corey–Chaykovsky-type reactions on the corresponding aldehyde. The exact synthetic route for this specific compound should be confirmed from the manufacturer's documentation or primary literature.

Storage: Epoxide-containing compounds should generally be stored in a cool, dry, well-ventilated location, away from moisture, heat, and strong nucleophiles or acids that could catalyze premature ring opening. Storage under inert atmosphere (nitrogen or argon) at reduced temperature is recommended to maximize shelf life. Always consult the product-specific Safety Data Sheet (SDS) provided by Aladdin Scientific for precise storage conditions.

Handling precautions: As with all reactive epoxides and halogenated aromatic compounds, standard laboratory personal protective equipment (PPE) should be worn, including nitrile gloves, safety glasses, and a laboratory coat. Work in a well-ventilated fume hood. Avoid generating dust or aerosols. The compound should be treated as a potential irritant and handled accordingly until full toxicological data are available.

Solubility: Halogenated fluorene derivatives are generally soluble in common organic solvents such as dichloromethane, chloroform, tetrahydrofuran (THF), dimethyl sulfoxide (DMSO), and dimethylformamide (DMF). Water solubility is expected to be low owing to the hydrophobic aromatic core. Verify solubility empirically before use in assay conditions.

Research Applications

2-(2,7-Dichloro-9H-fluoren-4-yl)oxirane serves as a versatile intermediate and building block across several research domains:

• Organic synthesis: The electrophilic epoxide ring undergoes ring-opening reactions with diverse nucleophiles, enabling the introduction of amino, hydroxyl, thio, or carbon-based substituents on the fluorene scaffold. This provides access to a library of functionalized fluorene derivatives useful for medicinal chemistry and materials research.
• Materials science and organic electronics: Fluorene derivatives are established components in organic light-emitting diodes (OLEDs), organic photovoltaics (OPVs), and conjugated polymer backbones. The halogen substituents allow further functionalization via metal-catalyzed cross-coupling reactions (e.g., Suzuki, Negishi, or Buchwald–Hartwig couplings), enabling construction of complex π-conjugated architectures.
• Medicinal chemistry: Fluorene-based scaffolds have been explored as pharmacophores, and epoxide-containing compounds can serve as covalent warheads or as intermediates toward biologically active molecules. The dual chloro substitution may modulate physicochemical properties such as lipophilicity and metabolic stability.
• Cross-coupling chemistry: The aryl chloride bonds at positions 2 and 7 are competent handles for palladium- or nickel-catalyzed cross-coupling reactions under appropriate conditions, enabling further diversification of the fluorene core after epoxide elaboration.

Quality, Purity, and Regulatory Considerations

Purity and specification: Aladdin Scientific provides research-grade reagents with defined purity specifications. Researchers should consult the certificate of analysis (CoA) supplied with each batch of D193785 to confirm purity (typically assessed by HPLC, GC, or NMR), identity (confirmed by mass spectrometry or NMR), and any residual solvent content before use in sensitive assays or scale-up synthesis.

Regulatory status: Halogenated aromatic epoxides may be subject to local chemical safety regulations. Researchers should verify whether this compound appears on any restricted substance lists applicable in their jurisdiction before ordering or importing. Review the SDS for hazard classifications (GHS) prior to use.

Quality control recommendations: For critical applications, independent verification of structure and purity by in-house NMR or mass spectrometry is recommended. Epoxide stability should be monitored over time, particularly if the compound is stored at room temperature or exposed to adventitious moisture, as slow hydrolysis to the corresponding diol may occur.