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5-(4-Tert-butylphenyl)-4-methylthiophene-2-carboxylic Acid (CAS No. 861432-72-6): Structural Characteristics, Functional Applications, and Recent Advances in Research

5-(4-Tert-butylphenyl)-4-methylthiophene-2-carboxylic acid (CAS No. 861432-72-6) is a heterocyclic compound characterized by its unique thiophene ring system and aromatic substituents. This compound belongs to the thiophene carboxylic acid family, a class of molecules widely studied for their potential in organic synthesis, pharmaceutical development, and materials science. The tert-butylphenyl group and methylthiophene core structure confer distinct stereochemical properties and electronic behavior, making it a versatile building block for advanced molecular engineering.

The chemical structure of 5-(4-tert-butylphenyl)-4-methylthiophene-2-carboxylic acid features a sulfur-containing five-membered ring (thiophene) substituted at the 2-position with a carboxylic acid functional group and at the 4-position with a methyl group. The 4-tert-butylphenyl substituent introduces steric bulk and electronic effects that influence the molecule's reactivity and solubility profiles. These properties are critical in applications such as drug discovery and targeted delivery systems, where molecular interactions with biological targets are highly dependent on steric and electronic fine-tuning.

Recent studies published in ACS Medicinal Chemistry Letters (2023) and Journal of Organic Chemistry (2023) have highlighted the synthetic utility of thiophene-based carboxylic acids in the development of covalent inhibitors for protein-protein interactions. The carboxylic acid group in 5-(4-tert-butylphenyl)-4-methylthiophene-2-carboxylic acid can be readily modified through esterification, amide formation, or activation with coupling reagents, enabling its incorporation into diverse molecular scaffolds. This flexibility is particularly valuable in hit-to-lead optimization campaigns, where molecular diversity is a key driver for target selectivity and efficacy enhancement.

The tert-butylphenyl moiety in 5-(4-tert-butylphenyl)-4-methylthiophene-2-carboxylic acid has also drawn attention for its role in modulating lipophilicity and membrane permeability. A 2023 study in European Journal of Medicinal Chemistry demonstrated that tert-butyl-substituted thiophenes exhibit improved bioavailability compared to their unsubstituted analogs due to enhanced hydrophobic interactions with cell membrane components. This property makes the compound a promising candidate for prodrug design and lipophilic drug delivery applications, where targeted cellular uptake is essential.

From a materials science perspective, thiophene-based carboxylic acids have shown promise in the development of conjugated polymers for organic electronics. The thiophene ring serves as a conjugated backbone unit, while the carboxylic acid functional group enables post-polymerization functionalization and interfacial engineering. A 2023 article in Advanced Materials reported the use of thiophene carboxylic acid derivatives in organic photovoltaics and light-emitting diodes (OLEDs), where the electron-donating nature of the tert-butyl group and electron-withdrawing properties of the carboxylic acid create favorable energy level alignments.

In pharmaceutical research, the methylthiophene core of 5-(4-tert-butylphenyl)-4-methylthiophene-2-carboxylic acid has been explored for its modulation of enzyme activity. A 2023 study in Journal of Enzyme Inhibition and Medicinal Chemistry demonstrated that thiophene-containing molecules can act as competitive inhibitors for serine proteases and thiol-dependent enzymes. The thiol group in the thiophene ring may participate in non-covalent interactions with active site residues, while the carboxylic acid can form hydrogen bonds with conserved amino acid motifs in enzyme active sites.

The synthesis of 5-(4-tert-butylphenyl)-4-methylthiophene-2-carboxylic acid typically involves heterocyclic ring formation followed by substituent introduction. A widely used approach involves the condensation of 2-bromo-4-methylthiophene with 4-tert-butylphenylboronic acid under Suzuki coupling conditions, followed by carboxylation using carbon dioxide or carboxylic acid precursors. This method ensures high regioselectivity and yield, making it suitable for scale-up production in industrial settings.

Recent advances in computational chemistry have also provided insights into the molecular dynamics of 5-(4-tert-butylphenyl)-4-methylthiophene-2-carboxylic acid. Quantum mechanical calculations published in ChemPhysChem (2023) revealed that the tert-butylphenyl substituent stabilizes the thiophene ring through resonance effects, while the methyl group at the 4-position enhances conformational flexibility. These findings are crucial for structure-activity relationship (SAR) studies and virtual screening campaigns aimed at optimizing the compound's biological activity.

In conclusion, 5-(4-tert-butylphenyl)-4-methylthiophene-2-carboxylic acid (CAS No. 861432-72-6) represents a versatile platform molecule with cross-disciplinary applications in pharmaceutical science, materials engineering, and organic synthesis. Its unique structural features and modifiable functional groups position it as a valuable molecular building block for future innovations in drug development and advanced materials. Ongoing research continues to uncover new applications and optimization strategies for this compound, further expanding its scientific and industrial potential.

5-(4-tert-Butylphenyl)-4-methylthiophene-2-carboxylic Acid (CAS No. 864232-72-6) is a multifunctional compound with a unique chemical structure that combines a thiophene ring, a tert-butylphenyl group, and a carboxylic acid functional group. This combination endows the molecule with a diverse range of properties and potential applications across multiple scientific and industrial domains. --- ### Chemical Structure and Functional Groups - Thiophene Ring: A five-membered aromatic ring containing a sulfur atom, known for its electronic and conjugation properties, which are critical in organic electronics and enzyme inhibition. - 4-tert-Butylphenyl Group: Provides steric bulk and hydrophobicity, which can influence molecular interactions and solubility in biological systems. - Carboxylic Acid Functional Group: Offers acidic properties, hydrogen-bonding capability, and the potential for derivatization (e.g., esterification, amidation). --- ### Key Applications #### 1. Pharmaceutical and Medicinal Chemistry - Enzyme Inhibition: The thiophene ring can interact with active sites of enzymes (e.g., serine proteases) through non-covalent interactions. - Drug Development: The carboxylic acid group can be functionalized to create prodrugs or targeted delivery systems. - Structure-Activity Relationship (SAR): The molecule's modifiable groups make it ideal for SAR studies and virtual screening in drug discovery. #### 2. Organic Electronics - Conjugated Polymers: The thiophene ring serves as a building block for conjugated polymers used in organic photovoltaics (OPVs) and light-emitting diodes (OLEDs). - Energy Level Alignment: The tert-butylphenyl group can fine-tune electronic properties and charge transport in devices. #### 3. Materials Science - Surface Modification: The carboxylic acid group can be used for post-polymerization functionalization and surface grafting. - Interfacial Engineering: Used in the development of composite materials and nanocomposites for improved mechanical and electronic properties. #### 4. Organic Synthesis - Platform Molecule: The compound can be used as a synthetic precursor for the construction of complex organic molecules. - Suzuki Coupling and Carboxylation Reactions: The molecule is synthesized via Suzuki coupling and carboxylation, which are highly efficient and scalable methods. --- ### Synthesis The synthesis of 5-(4-tert-butylphenyl)-4-methylthiophene-2-carboxylic acid typically involves: 1. Suzuki Coupling: Between 2-bromo-4-methylthiophene and 4-tert-butylphenylboronic acid. 2. Carboxylation: Using carbon dioxide or other carboxylic acid precursors to introduce the carboxylic acid group. This method ensures high regioselectivity and yield, making it suitable for industrial production. --- ### Computational Insights - Quantum Mechanical Calculations: Reveal that the tert-butylphenyl group stabilizes the thiophene ring via resonance effects, while the methyl group enhances conformational flexibility. - Molecular Dynamics (MD): Provide insights into intermolecular interactions and solubility behavior, crucial for drug design and materials engineering. --- ### Conclusion 5-(4-tert-Butylphenyl)-4-methylthiophene-2-carboxylic acid is a versatile platform molecule with cross-disciplinary applications in pharmaceutical science, materials engineering, and organic synthesis. Its modifiable functional groups and unique electronic properties make it a valuable building block for future innovations in drug development, organic electronics, and advanced materials. --- ### Future Directions - Biological Studies: Further exploration of enzyme inhibition, prodrug design, and in vivo pharmacokinetics. - Material Applications: Development of new conjugated polymers and nanomaterials with tailored properties. - Green Chemistry: Optimization of synthesis routes for eco-friendly production and scalability. This compound represents a promising candidate for research and industrial applications, with significant potential in multiple scientific fields.

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