Reactions of (η3-Allyl)dicarbonyltungsten(II) complexes containing group V donor ligands

摘要: Reactions of [WX(η3-C3H5)(CO)2(MeCN)2] with the ditertiary arsines Ph2AsCH2CH2AsPh2 (dae) and (dam) yield complexes stoichiometry [WX(η3-C3H5)(CO)2dae], (X = Cl, Br or I) [W2X2(η3-C3H5)2(CO)4dam], Cl Br). Whereas former series contain chelating dae, latter dam bridges which are readily cleaved by pyridine (py), phosphines Ph2PCH2PPh2 (dpm) Ph2PCH2CH2PPh2 (dpe), chloride ions to give [WX(η3-C3H5)(CO)2L2], (L2 dpm, dpe 2py) [W2Cl3(η3-C3H5)2(CO)4]− respectively. Under forcing conditions nitrile react low yields tungsten(0) derivatives cis-[W(CO)2(L2)2]. The solution ionization [WCl(η3-C3H5)(CO)2(MeCN)2] [W(η3-C3H5)(CO)2(MeCN)3+[W2Cl3(η3-C3H5)2(CO)4]− free is slight compared molybdenum analoque.