B(C6F5)3 -Enabled Synthesis of a Cyclic cis-Arsaphosphene

Meera Mehta, John E. McGrady, Jose M. Goicoechea

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The synthesis and characterization of an (arsino)phosphaketene, As(PCO){[N(Dipp)](CH 2 )} 2 (Dipp=2,6-diisopropylphenyl) is reported along with its subsequent reactivity with B(C 6 F 5 ) 3 . When reacted in a stoichiometric ratio, B(C 6 F 5 ) 3 drove the insertion of the P=C bond of the phosphaketene into one of the As−N bonds of the arsino functionality, affording an acid-stabilized, seven-membered, cyclic arsaphosphene. In contrast, when catalytic amounts of B(C 6 F 5 ) 3 were employed, dimeric species, which formed through a formal [2+2] cycloaddition of the cyclic arsaphosphene, were generated. The cyclic arsaphosphene product represents the first example of such a compound in which the two substituents are arranged in a cis-configuration.
Original languageEnglish
Pages (from-to)5445-5450
Number of pages6
JournalChemistry - A European Journal
Issue number21
Early online date11 Apr 2019
Publication statusPublished - 11 Apr 2019


  • arsaphosphenes
  • boranes
  • catalysis
  • main-group elements
  • phosphaketenes


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