Cationic Phosphinidene as a Versatile P₁ Building Block: [L_C-P]⁺ Transfer from Phosphonio-Phosphanides [L_C-P-PR₃]⁺...

Area of Science:

• Organometallic Chemistry
• Synthetic Chemistry
• Main group chemistry

Background:

• Cationic phosphanides are versatile synthons.
• Phosphaalkenes and their metal complexes are of significant interest.

Purpose of the Study:

• To synthesize and characterize novel cationic imidazoliumyl(phosphonio)-phosphanides.
• To explore their reactivity as P1 transfer reagents.
• To investigate the formation of new organophosphorus compounds and metal complexes.

Main Methods:

• Nucleophilic fragmentation of tetracationic tetraphosphetanes.
• Phospha-Wittig-type reactions with thiocarbonyls.
• Reactions with phosphaalkenes and metal complexes.
• Theoretical calculations.

Main Results:

• Synthesis of cationic imidazoliumyl(phosphonio)-phosphanides [L_C-P-PR₃]⁺.
• Formation of cationic phosphaalkenes [L_C-P═CR₂]⁺ and phosphanides [L_C-P-CR(NR₂^')]⁺.
• Isolation of diphosphirane salts and preliminary synthesis of P-metal complexes.
• Demonstration of the P1 building block utility in substitution reactions.

Conclusions:

• Cationic phosphanides are effective P1 transfer reagents.
• The methodology provides access to unprecedented cationic phosphaalkenes and related compounds.
• This work expands the scope of organophosphorus synthesis and coordination chemistry.