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A phosphazene is any of a class of chemical compounds in which a phosphorus atom is covalently linked to a nitrogen atom by a double bond and to three other atoms or radicals by single bonds. Two examples are hexachlorophosphazene and bis(triphenylphosphine)iminium chloride.
Additional recommended knowledge
The corresponding polymers are polyphosphazenes.
Phosphazene bases are strong non-metallic non-ionic and non-nucleophilic bases. They are stronger bases than regular amine bases such as DBU or Hünig's base. Protonation takes place at a nitrogen atom.
Two commercially available phosphazene bases are BEMP with a pKa of the conjugate acid of 27.6 and the phosphorimic triaminde t-Bu-4P (pKBH+ = 41.9) also known as Schwesinger base after one of its inventors.
The related proazaphosphatrane superbases have a saturated P(NR)3 structure and protonation takes place at phosphorus.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Phosphazene". A list of authors is available in Wikipedia.|