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• 2. Excitation energies from ground-state density-functionals by means of generator coordinates
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Introduction to 3,5-dibromo-2-ethynylthiophene (CAS No: 2229582-17-4)

3,5-dibromo-2-ethynylthiophene, with the chemical formula C?H?Br?S and CAS number 2229582-17-4, is a significant compound in the field of organic synthesis and pharmaceutical research. This heterocyclic aromatic molecule features a thiophene core substituted with two bromine atoms at the 3 and 5 positions and an ethynyl group at the 2 position. Its unique structural properties make it a valuable building block for the development of novel materials and bioactive molecules.

The compound's molecular structure combines the electron-deficient nature of bromine atoms with the electron-rich thiophene ring and the triple bond of the ethynyl group. This combination facilitates diverse chemical transformations, making 3,5-dibromo-2-ethynylthiophene a versatile intermediate in synthetic chemistry. The presence of bromine atoms allows for further functionalization via cross-coupling reactions, such as Suzuki-Miyaura, Heck, and Buchwald-Hartwig couplings, which are widely employed in constructing complex organic molecules.

In recent years, 3,5-dibromo-2-ethynylthiophene has garnered attention in the pharmaceutical industry due to its potential applications in drug discovery. Thiophene derivatives are known for their broad biological activity, including antimicrobial, anti-inflammatory, and anticancer properties. The ethynyl group provides a handle for further derivatization, enabling the synthesis of pharmacophores with enhanced binding affinity to biological targets. Several studies have highlighted its role in developing small-molecule inhibitors targeting enzymes involved in cancer metabolism.

One notable application of 3,5-dibromo-2-ethynylthiophene is in the synthesis of conjugated polymers for organic electronics. The thiophene core is a cornerstone in polymer chemistry due to its ability to form stable π-conjugated systems. When incorporated into polymers or small molecules, it enhances charge transport properties, making it suitable for use in organic light-emitting diodes (OLEDs), field-effect transistors (OFETs), and photovoltaic cells. The bromine substituents further enable post-polymerization modifications, allowing for fine-tuning of material properties such as solubility and film-forming characteristics.

Recent advancements in synthetic methodologies have expanded the utility of 3,5-dibromo-2-ethynylthiophene. For instance, palladium-catalyzed reactions have enabled efficient coupling with various nucleophiles, including alkynes and aryl halides, facilitating the construction of intricate molecular architectures. Additionally, transition-metal-catalyzed cyclizations have been employed to generate fused heterocycles containing thiophene units, which are prevalent in many bioactive natural products.

The compound's reactivity also makes it a valuable tool in medicinal chemistry. Researchers have leveraged its scaffold to develop novel antiviral agents by incorporating functional groups that interact with viral proteases or polymerases. The ethynyl group serves as a precursor for thiolation reactions, allowing for the introduction of sulfur-containing moieties that are known to modulate protein-protein interactions. Such modifications have been explored in designing inhibitors targeting viral replication cycles.

In materials science, 3,5-dibromo-2-ethynylthiophene has been utilized in designing luminescent materials due to its ability to form stable metal complexes with transition metals such as iridium and platinum. These complexes exhibit tunable emission wavelengths and high quantum yields, making them suitable for use in optoelectronic devices. Furthermore, its incorporation into metal-organic frameworks (MOFs) has shown promise in developing porous materials with applications in gas storage and separation.

The synthesis of 3,5-dibromo-2-ethynylthiophene itself is an intriguing aspect of organic chemistry. Traditional methods involve bromination of thiophene precursors followed by selective ethynylation. However, recent studies have explored more efficient routes using catalytic systems that minimize byproduct formation and improve yield. For example, copper-catalyzed Sonogashira couplings have been optimized for the introduction of the ethynyl group under mild conditions.

The compound's stability under various reaction conditions has also been a focus of research. Studies have demonstrated that 3,5-dibromo-2-ethynylthiophene retains its integrity during prolonged storage periods when handled under inert atmospheres. This stability is crucial for pharmaceutical applications where long-term storage without degradation is essential.

In conclusion,3,5-dibromo,2--ethynylthiophene (CAS No: 2229582--17--4) is a multifaceted compound with broad applications across multiple disciplines. Its unique structural features make it an indispensable intermediate in pharmaceutical synthesis, material science,and organic electronics. As research continues to uncover new methodologies and applications, this compound will undoubtedly play an increasingly significant role in advancing scientific innovation.

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