A facile route to cis-olefin-linked phosphino-phosphonium salts of the form: Ph2PC(R)C(H)P(R’)2HAlCl4Ϯ

Key Points

• Dissymmetric bidentate phosphonium salts are produced from reactions with secondary phosphines.
• The phosphonium salts are characterized by their unique diphenylphosphirenum structure and reactivity.
• Synthesis involved generating diphenylphosphirenum salts, which readily react with secondary phosphines.
• The study suggests synthetic routes for new phosphorus-containing materials with possible applications.