mu-Oxo-bis[tris(dimethylamino)phosphonium] Bis(tetrafluoroborate) is a mild dehydrating agent, useful in peptide synthesis,[1] dehydration of aldoximes to nitriles[2] and Beckmann
or Lossen-type rearangements.[2]
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Preparative Methods of mu-Oxo-bis[tris(dimethylamino)phosphonium] Bis(tetrafluoroborate): by treatment of Hexamethylphosphoric Triamide with p-toluenesulfonic anhydride
at 55 °C for 3 h, isolation of the bis(p-toluenesulfonate), then treatment with NaBF4 in MeCN.[1]