• 1. An air-stable organometallic polymer containing titanafluorene moieties obtained by the Sonogashira–Hagihara cross-coupling polycondensation?
  Alvin Tanudjaja,Shinsuke Inagi,Fusao Kitamura,Toshikazu Takata,Ikuyoshi Tomita Dalton Trans., 2021,50, 3037-3043
• 2. An integrated droplet-digital microfluidic system for on-demand droplet creation, mixing, incubation, and sorting?
  Lab Chip, 2019,19, 524-535
• 3. An aqueous ammonia sensor based on an inkjet-printed polyaniline nanoparticle-modified electrode
  Karl Crowley,Eimer O'Malley,Aoife Morrin,Malcolm R. Smyth,Anthony J. Killard Analyst, 2008,133, 391-399
• 4. An approach to biodegradable star polymeric architectures using disulfide coupling?
  Jingquan Liu,Huiyun Liu,Zhongfan Jia,Volga Bulmus,Thomas P. Davis Chem. Commun., 2008, 6582-6584
• 5. Alternative mixtures to R-600a. Theoretical assessment and experimental energy evaluation of binary mixtures in a commercial cooler: Mélanges alternatifs au R-600a. évaluation théorique et évaluation énergétique expérimentale de mélanges binaires dans un refroidisseur commercial.
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• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Thiophenes Thiophene carboxylic acids
• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Thiophenes Thiophene carboxylic acids and derivatives Thiophene carboxylic acids

5-Ethylthiophene-2-carboxylic Acid (CAS No. 23229-72-3): Properties, Applications, and Market Insights

5-Ethylthiophene-2-carboxylic acid (CAS No. 23229-72-3) is a specialized organic compound that has garnered significant attention in pharmaceutical and materials science research. This heterocyclic carboxylic acid derivative belongs to the thiophene family, characterized by its unique molecular structure combining a five-membered aromatic ring with sulfur and an ethyl substituent at the 5-position. The compound's chemical formula C7H8O2S and molecular weight of 156.20 g/mol make it particularly interesting for various synthetic applications.

The growing interest in thiophene derivatives like 5-ethylthiophene-2-carboxylic acid stems from their versatile applications in drug discovery and material engineering. Recent searches on scientific databases show increasing queries about "thiophene-based pharmaceuticals" and "heterocyclic building blocks," reflecting the compound's relevance in current research trends. Its structural features make it valuable for creating bioactive molecules, with particular potential in developing novel anti-inflammatory agents and central nervous system (CNS) drugs.

From a chemical perspective, 5-ethylthiophene-2-carboxylic acid exhibits several notable properties. The compound typically appears as a white to off-white crystalline powder with moderate solubility in common organic solvents like ethanol, methanol, and dimethyl sulfoxide (DMSO). Its carboxylic acid functional group provides an excellent handle for further chemical modifications, making it a valuable intermediate in organic synthesis. The ethyl substituent influences the compound's electronic properties and steric profile, which can be crucial for specific applications.

In pharmaceutical research, 5-ethylthiophene-2-carboxylic acid serves as a key building block for various drug candidates. The thiophene ring system is known to enhance drug-like properties, including improved metabolic stability and membrane permeability. Recent publications highlight its use in developing potential kinase inhibitors and GPCR modulators, addressing current medical needs in oncology and neurological disorders. The compound's structural features allow medicinal chemists to explore diverse structure-activity relationships while maintaining favorable pharmacokinetic profiles.

The materials science field has also shown growing interest in thiophene derivatives like 5-ethylthiophene-2-carboxylic acid. These compounds contribute to developing advanced organic electronic materials, particularly in conductive polymers and organic semiconductors. The conjugated system of the thiophene ring enables electron delocalization, which is essential for creating materials with tailored optoelectronic properties. This aligns with current industry trends toward flexible electronics and sustainable energy solutions.

Market analysis indicates steady growth in demand for specialized heterocyclic compounds like 5-ethylthiophene-2-carboxylic acid. The global market for pharmaceutical intermediates is projected to expand significantly, driven by increasing R&D investments in drug discovery. Suppliers report growing inquiries about custom synthesis of thiophene derivatives, particularly for academic and industrial research applications. Quality specifications typically require high purity levels (>98%) with comprehensive analytical characterization, including HPLC, NMR, and mass spectrometry data.

From a synthetic chemistry perspective, 5-ethylthiophene-2-carboxylic acid offers multiple advantages. The compound can be prepared through various routes, including halogen-metal exchange reactions or cross-coupling methodologies starting from appropriate thiophene precursors. Recent advances in catalytic processes have improved the efficiency of producing such functionalized thiophenes, addressing common challenges in yield and selectivity. These developments contribute to more sustainable synthetic approaches in line with green chemistry principles.

Storage and handling of 5-ethylthiophene-2-carboxylic acid require standard laboratory precautions. The compound should be kept in a cool, dry environment, protected from light and moisture. While not classified as highly hazardous, proper personal protective equipment (PPE) including gloves and safety glasses is recommended when handling. These considerations align with general laboratory safety protocols for organic compounds.

The future outlook for 5-ethylthiophene-2-carboxylic acid appears promising, with potential applications expanding beyond current uses. Emerging research areas like bioconjugation chemistry and targeted drug delivery systems may create new opportunities for this versatile building block. Additionally, the compound's potential in developing metal-organic frameworks (MOFs) and other advanced materials continues to attract scientific interest. As synthetic methodologies advance and analytical techniques become more sophisticated, the full potential of this thiophene derivative may be further unlocked.

For researchers and industry professionals seeking high-quality 5-ethylthiophene-2-carboxylic acid, it's essential to source from reputable suppliers who provide comprehensive analytical data and documentation. The compound's purity and consistency are critical factors for successful applications in both pharmaceutical and materials science research. With proper characterization and handling, this specialty chemical can serve as a valuable tool in various scientific endeavors.

• 155187-60-3(2-Thiophenecarboxylic acid, 5-[1-(2-thienyl)ethyl]-)
• 63068-75-7(2-Thiophenecarboxylic acid, 5-pentyl-)
• 478022-18-3(5-tert-butyl-thiophene-2-carboxylic Acid)
• 29481-42-3(5-(propan-2-yl)thiophene-2-carboxylic acid)
• 4066-41-5(5-Acetylthiophene-2-carboxylic acid)
• 247128-25-2(5-(2-Hydroxyethyl)thiophene-2-carboxylic acid)
• 29212-25-7(5-tert-Butylthiophene-2-carboxylic Acid)
• 63068-73-5(5-Propylthiophene-2-carboxylic acid)
• 88962-12-3(2-Thiophenecarboxylic acid, 5-(3-oxobutyl)-)
• 59782-35-3(2-thiophenecarboxylic acid, 5-tridecyl-)