1-Ethyl-3-methylimidazolium tosylate, CAS: 328090-25-1

Key Applications:

1. Catalysis and Organic Synthesis

• Functions as a Brønsted‑acidic ionic liquid catalyst for esterification, acetalization, alkylation, and dehydration reactions.
• Serves as a dual solvent–catalyst medium, reducing reliance on mineral acids.
• Stabilizes carbocationic intermediates, improving selectivity in electrophilic aromatic substitution and related transformations.
• Supports green chemistry workflows through recyclability and low volatility.

2. Biomass Processing and Lignocellulosic Chemistry

• Dissolves lignin and lignin‑rich fractions, enabling fractionation, depolymerization, and valorization studies.
• Acts as a pretreatment solvent to enhance enzymatic hydrolysis efficiency.
• Provides selective solubilization of aromatic biopolymers for biorefinery R&D.

3. Electrochemical Applications

• Used as an electrolyte component in supercapacitors and redox systems where aromatic sulfonate anions improve thermal stability.
• Provides a high‑conductivity ionic medium for electrodeposition of metals and semiconductors.
• Maintains stability at elevated temperatures for high‑temperature electrochemical studies.

4. Polymer and Materials Processing

• Serves as a solvent for polystyrene, PMMA, and other aromatic polymers due to strong π–π interactions with the tosylate anion.
• Provides a medium for polymer functionalization, including sulfonation and grafting reactions.
• Acts as a template or structure‑directing agent in nanoparticle and mesoporous material synthesis.

5. Phase‑Transfer and Separation Science

• Functions as an efficient phase‑transfer catalyst for hydrophobic substrates.
• Enables extraction of aromatic compounds, including phenols and substituted benzenes.
• Supports biphasic catalysis with clean product separation and ionic liquid recycling.

6. Thermal and Process Engineering

• High‑boiling, thermally robust solvent suitable for elevated‑temperature reactions.
• Useful as a heat‑transfer medium in small‑scale process intensification studies.
• Provides a non‑volatile alternative to traditional organic solvents in closed‑loop systems.

7. Analytical and Spectroscopic Uses

• Serves as a matrix for MALDI and other ionization techniques, particularly for aromatic analytes.
• Functions as a solvent for NMR studies of acid‑sensitive compounds due to its mild acidity and high polarity.
• Stabilizes reactive intermediates for mechanistic investigations.

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