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[((Cl)Im(Dipp))P=P(Dipp)][GaCl4]: a polarized, cationic diphosphene.

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Neutral diphosphanide reacts with methyl triflate to form a cationic diphosphane. Reaction with GaCl3 yields a cationic diphosphene, which acts as a nucleophile acceptor, showcasing unique phosphorus chemistry.

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Area of Science:

  • Organophosphorus Chemistry
  • Inorganic Chemistry
  • Computational Chemistry

Background:

  • Diphosphanides and diphosphenes are key phosphorus compounds with diverse reactivity.
  • Understanding their electronic structure and reaction mechanisms is crucial for developing new synthetic methodologies.

Purpose of the Study:

  • To investigate the reactivity of a neutral diphosphanide with electrophiles.
  • To explore the formation and properties of cationic diphosphenes.
  • To elucidate the bonding characteristics of these novel phosphorus species using computational methods.

Main Methods:

  • Reaction of a neutral diphosphanide with methyl triflate and gallium trichloride.
  • Characterization of reaction products using spectroscopic techniques.
  • Density Functional Theory (DFT) calculations to analyze bonding and electronic structure.

Main Results:

  • Stereoselective methylation of the diphosphanide to a cationic diphosphane was achieved.
  • Reaction with GaCl3 afforded a cationic diphosphene with a polarized P=P double bond.
  • The cationic diphosphene demonstrated nucleophilic acceptor capabilities, reacting with chloride and trimethylphosphine.

Conclusions:

  • The distinct reactivity of the diphosphanide towards different electrophiles highlights tunable synthetic pathways.
  • The polarized P=P bond in the cationic diphosphene enables further functionalization.
  • DFT investigations provide valuable insights into the electronic structure and bonding of these organophosphorus compounds.