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Bis(triphenylphosphine)iminium chloride : ウィキペディア英語版 | Bis(triphenylphosphine)iminium chloride
|Section2= |Section7= |Section8= }} Bis(triphenylphosphine)iminium chloride is the chemical compound with the formula ()Cl, often written ()Cl and abbreviated PPNCl. This colorless salt is a source of the PPN+ cation, which is used to isolate reactive anions. PPN+ is a phosphazene. ==Synthesis and structure== PPNCl is prepared in two steps from triphenylphosphine: :Ph3P + Cl2 → Ph3PCl2 This triphenylphosphine dichloride is related to phosphorus pentachloride. Treatment of this species with hydroxylamine in the presence of Ph3P results in replacement of the P-Cl bonds by P=N bonds: :2 Ph3PCl2 + NH2OH·HCl + Ph3P → Cl + 4HCl + Ph3PO In PPN+ salts, P-N bond lengths are equivalent, 1.58 Å. The cation is bent at the central nitrogen, and has no inversion centre. Its connectivity is indicated by Ph3P=N=PPh3+.
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