09-18-2021-0759 - Cyaphide SiR3-functionalised phosphaalkynes cyaphide complex Organometallic complexes of cyaphide were first reported in 1992 From 2-phosphaethynolate anion (−OC≡P) RuH(dppe) 2(CP) phosphaalkyne (P≡CH) Methylidynephosphane Phosphorus

 Cyaphide, P≡C⁻, is the phosphorus analogue of cyanide. It is not known as a discrete salt, however In silico measurements reveal that the −1 charge in this ion is located mainly on carbon (0.65), as opposed to phosphorus.

Contents

• 1Preparation
  • 1.1From SiR₃-functionalised phosphaalkynes
  • 1.2From 2-phosphaethynolate anion (⁻OC≡P)
• 2See also
• 3References

Preparation[edit]

Organometallic complexes of cyaphide were first reported in 1992.^[1] More recent preparations use two other routes:

From SiR₃-functionalised phosphaalkynes[edit]

Treatment of the η¹-coordinated phosphaalkyne complex trans–[RuH(P≡CSiPH
3)(dppe)
2]+
 with an alkoxide resulted in desilylation, followed by subsequent rearrangement to the corresponding carbon-bound cyaphide complex.^[2] Cyaphide-alkynyl complexes are prepared similarly.^[3]

From 2-phosphaethynolate anion (⁻OC≡P)[edit]

An actinide cyaphide complex can be prepared by C−O bond cleavage of the phosphaethynolate anion, the phosphorus analogue of cyanate.^[4] Reaction of the uranium complex [((Ad,Me
ArO)
3N)UIII
(DME)] with [Na(OCP)(dioxane)
2.5] in the presence of 2.2.2-cryptand results in the formation of a dinuclear, oxo-bridged uranium complex featuring a C≡P ligand.

See also[edit]

• phosphaalkyne (P≡CH)
• Methylidynephosphane

Structure of the first transition metal cyaphide complex, RuH(dppe)
2(CP)

https://en.wikipedia.org/wiki/Cyaphide