Phosphorous(v) Lewis acids: water/base tolerant P₃-trimethylated trications

Area of Science:

• Organophosphorus chemistry
• Catalysis

Background:

• Electrophilic phosphonium cations typically exhibit water/base intolerance due to labile electron-withdrawing groups.
• This limits their application in various chemical processes.

Purpose of the Study:

• To develop novel phosphonium cations with enhanced stability towards water and base.
• To investigate the catalytic potential of these new species.

Main Methods:

• Synthesis of tri-phosphorus(V) tricationic species by replacing labile groups with methyl groups.
• One-pot synthesis from commercially available starting materials.

Main Results:

• The newly synthesized phosphonium cations demonstrate excellent air and water/base tolerance.
• These compounds retain sufficient Lewis acidity for catalytic applications.

Conclusions:

• Replacing electron-withdrawing groups with methyl groups effectively enhances the stability of phosphonium cations.
• These robust and accessible phosphonium species represent promising catalysts for various chemical transformations.