Abstract
AbstractMetathesis of chloro‐substituted N‐heterocyclic phosphanes, arsanes, and stibanes with lithium tetraethylphospholide or ‐arsolide gave interpnictogen compounds 2–4 with As–P or Sb–P bonds, respectively. The products were characterised by analytical and spectroscopic data and single‐crystal X‐ray diffraction studies. All compounds feature central E–E′ bonds that are notably longer (5–12 %) than standard bond lengths, and the As–P bond in the isomers 2 and 3 which are merely distinguished by formal exchange of the pnictogen atoms between both rings differ by some 4 pm. The observed structural features suggest that compounds 2–4 may, like the corresponding diphosphanes, be perceived as adducts of Lewis‐pairs which are held together by a dative interpnictogen bond.
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