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Keywords:

  • iminophosphoranes;
  • lithium compounds;
  • NMR spectroscopy;
  • phosphanes;
  • solid-state structures
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Totally different reactivity is observed in the reactions of the two isoelectronic iminophosphoranes Py3P [DOUBLE BOND] NSiMe3 (Py = 2-pyridyl) and Ph3P [DOUBLE BOND] NSiMe3 with methyllithium. While the first, even at −78 °C, spontaneously yields a monomeric amide on reduction of phosphorus(V) to phosphorus(III), the triphenyliminophosphorane yields the dimer 1 only after several days at room temperature in a deprotonation reaction of one phenyl ring in the ortho position.