Tetrabutylphosphonium bromide, CAS: 3115-68-2

Key Applications:

1. Phase‑Transfer Catalysis (PTC)

• Facilitates nucleophilic substitution, alkylation, and condensation reactions.
• Effective for transferring anions (e.g., CN⁻, OH⁻, alkoxides) into organic phases.
• Often chosen when higher thermal stability is required compared to ammonium salts.

2. Precursor for Phosphonium Ionic Liquids

• Used to synthesize hydrophobic ionic liquids via anion exchange (e.g., PF₆⁻, BF₄⁻, NTf₂⁻).
• Enables tuning of viscosity, conductivity, and electrochemical stability for:
  • Electrolytes
  • Solvent systems
  • Extraction media

3. Electrolytes and Electrochemical Systems

• Serves as a starting material for phosphonium-based electrolytes in:
  • Lithium battery research
  • Supercapacitors
  • High‑temperature electrochemical devices
• Phosphonium salts offer superior thermal and electrochemical stability compared to ammonium analogs.

4. Solvent and Co‑Solvent in Organic Synthesis

• Used in biphasic and nonaqueous systems to enhance solubility of polar intermediates.
• Supports reactions requiring high ionic strength or low volatility.

5. Extraction and Separation Processes

• Acts as a building block for task‑specific ionic liquids used in:
  • Metal ion extraction
  • Biomass fractionation
  • CO₂ capture and gas separations

6. Polymer and Materials Chemistry

• Incorporated into polymerizable ionic liquids or ion‑conductive materials.
• Used to modify polymer matrices for improved thermal stability or ion transport.

7. Antimicrobial and Antistatic Additives (Research‑Stage)

• Quaternary phosphonium salts show antimicrobial activity in coatings and films.
• Evaluated for antistatic and surface‑modifying applications.

8. Crystallization and Catalytic Media

• Provides a tunable ionic environment for:
  • Organometallic catalysis
  • Enzyme stabilization in nonaqueous media
  • Crystallization of inorganic complexes

Please contact us if you want to learn more or need assistance with your order.