143281-01-0

Upstream product

• 594-09-2 trimethylphosphane 

Downstream Products

• 143281-03-2 {WCl₂((CC₆H₅)2)(P(CH₃)3)3} 
• 144030-56-8 WCl₂(C₆H₅C₂C₆H₅)(CH₂CHCH₃)(P(CH₃)3)2 
• 158079-96-0 WCl₂(C₆H₅CCC₆H₅)(CH₃CCCH₃)(P(CH₃)3)2 
• 143281-03-2 WCl₂(PhC₂Ph)(PMe₃)3 
• 144030-56-8 WCl₂(C₆H₅CCC₆H₅)(CH₂CHCH₃)(P(CH₃)3)2 
• 158080-00-3 WCl₂(PhC₂Ph)(CO)(PMe₃)2 

Relevant academic research and scientific papers

High-valent Diphenylacetylene Complexes of Tungsten

The W(4f7/2) binding energy of 2> 1 obtained by X-ray photoelectron spectroscopy is similar to that of 2> and is consistent with a d0 tungsten(VI) formulation.The reaction of complex 1 and 2 with NaOH-EtOH gave cis-stilbene, indicating considerable electron transfer from the metal to the co-ordinated alkyne.Reduction of complex 1 with 2 equivalents of sodium-mercury amalgam in the presence of phosphines gave the complexes (L = PMe3, PMe2Ph or PMePh2) with magnetic moments and W(4f7/2) binding energies similar to those of the d1 tungsten(V) organoimido complex .Decomposition of the alkyne complexes with NaOH-EtOH again gave cis-stilbene.The crystal structure of 3 has been determined.The W-Cl bond trans to the alkyne ligand is long , and the W-C bond lengths indicate a four-electron-donor alkyne ligand.The geometry is similar to that of .Reduction of 2> using 4 equivalents of sodium-mercury amalgam in the presence of phosphines gave the complexes (L = PMe3 or PMe2Ph) which again produced cis-stilbene on decomposition with NaOH-EtOH.The acetylenic carbon resonance at δ 223.15 in the 13C- NMR spectrum of 6 is also indicative of a four-electron-donor alkyne ligand.Its W(4f7/2) binding energy is similar to and is consistent with tungsten(IV).A crystal structure of complex 6 shows a similar ligand geometry to , and the W-C bond lengths indicate a four-electron-donor alkyne ligand.Hartree-Fock and scattered wave Xα calculations have been performed on the model complexes (1-) 8, 9 and 10.Molecular orbital and population analyses indicated that the acetylene-tungsten bond in each involves W(5d?)-->HC2H(?*) back donation as well as HC2H(?)-->W(5d?) and HC2H(?)-->W(5d?) forward donation, consistent with a four-electron-donor alkyne formalism.Electron withdrawal from the tungsten to the more electronegative Cl ligand in complexes 8 and 9 is minimised by rotation of the alkyne away from the meridional vectors.In complex 10 the HC2H(?)-->W(5d?) donation and phosphine contributions compensate and no rotation is observed.The total d atomic orbital population of complex 8 is close to that of WCl6, and populations of complexes 9 and 10 step up linearly from this.The computational results support the experimental evidence that 2> 1, 3 and 6 are complexes of tungsten-(VI), -(V) and -(IV) respectively.