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Updated: Mar 2, 2026

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
Published on: August 22, 2018
Isolation of Azadiphosphiridines and Diphosphenimines by Cycloaddition of Azides and a Cationic Diphosphene
Kai Schwedtmann1, Felix Hennersdorf1, Antonio Bauzá2
1Department of Chemistry and Food Chemistry, TU Dresden, Chair of Inorganic Molecular Chemistry, 01062, Dresden, Germany.
Abstract:
The polarized, cationic diphosphene [(Cl ImDipp )P=P(Dipp)]+ as the triflate salt 7[OTf](Cl ImDipp =4,5-dichloro-1,3-bis(Dipp)-imidazol-2-yl; Dipp=2,6-diisopropylphenyl) reacts with azides of type RN3 (R=Dipp or Dmp; Dmp=2,5-dimethylphenyl) in a [2+3] cycloaddition reaction followed by the release of N2 and a subsequent electrocyclic ring-closing reaction to azadiphosphiridine salts [(Cl ImDipp )P-P(Dipp)-N(R)]10a,b[OTf] (R=Dipp or Dmp). The reaction of 7[X] (X=OTf, GaCl4 ) with the electron-rich azides Me3 SiN3 and NaN3 give the unusual diphosphenimine derivatives [(Cl ImDipp )P-P(Dipp)=N(SiMe3 )]+ (11[OTf]) and [(Cl ImDipp )P-P(Dipp)=N(GaCl3 )] (12), respectively, featuring an acyclic P2 N moiety. Theoretical calculations provide insights into the reaction mechanisms to the cyclic and acyclic forms, in which the thermodynamic stability of the latter prevents the electrocyclic ring closure.
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