Pyrido-annellated diazaphospholenes and phospholenium ions

Z Benko, S Burk, D Gudat, Martin Nieger, L Nyulaszi, N Shore

    Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review


    Pyrido-annulated 1,3,2-diazaphospholenium ions and P-bis(trimethylsilyl) amino substituted 1,3,2-diazaphospholenes were synthesised and characterised by spectroscopic methods and single-crystal X-ray diffraction studies. The distribution of bond distances provided evidence for pi-electron delocalisation in the fused ring system. This hypothesis was confirmed by calculations of magnetic (NICS, nucleus independent chemical shift) and geometrical (Bird index, bond shortening index) aromaticity indexes which attest aromatic character of the five-membered rings in the cations that is lost upon introduction of a substituent at the phosphorus atom. Computation of isodesmic reaction energies suggest that the reclamation of aromatic stabilisation energies in the products facilitates reaction of P-amino-subsituted annulated diazaphospholenes under cleavage of the fused ring system.
    TidskriftDalton Transactions
    Sidor (från-till)4937-4945
    Antal sidor9
    StatusPublicerad - 2008
    MoE-publikationstypA1 Tidskriftsartikel-refererad

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