1-Ethyl-4-methylpyridinium bromide, CAS: 32353-49-4

Key Applications:

Organic Synthesis & Catalysis

• Functions as a phase‑transfer catalyst in nucleophilic substitution, alkylation, and condensation reactions where enhanced ion pairing improves reaction rates.
• Serves as a reaction medium or co‑solvent for transformations requiring high ionic strength or suppressed volatility.
• Useful in microwave‑assisted synthesis, where ionic liquids accelerate heating and improve yields.

Materials Science & Polymer Processing

• Employed as a structure‑directing additive in polymer electrolytes and ion‑conducting films, leveraging its stable pyridinium core.
• Enhances ionic mobility in polymer matrices, enabling tunable conductivity for membranes and specialty coatings.
• Acts as a templating agent in the formation of mesoporous inorganic materials.

Electrochemical Systems

• Used as a supporting electrolyte in redox studies, electrodeposition, and electroanalytical methods due to its wide electrochemical stability window.
• Improves charge transport in non‑aqueous systems where bromide counterions support halide‑mediated redox cycling.
• Suitable for ionic‑liquid‑modified electrodes, enhancing surface charge density and interfacial behavior.

Solvent & Extraction Applications

• Effective in liquid–liquid extraction of metal ions, aromatic compounds, and halogenated species through ion‑exchange and π‑cation interactions.
• Supports selective separations in biphasic systems where hydrophobicity and cation structure influence partitioning.

Crystallization & Analytical Chemistry

• Used as a crystallization aid for halide‑containing complexes and salts.
• Serves as a reference ionic liquid in studies comparing positional methyl effects (2‑, 3‑, vs. 4‑methyl) on solvation, viscosity, and conductivity.

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