Chemistry of polynuclear metal complexes with bridging carbene or carbene ligands. Part 108. Synthesis and reactions of the alkylidynetungsten complexes [W(CR)(CO)2{(F3B)C(pz)3}](R = Me or C6H4Me-4, pz = pyrazol-1-yl) and their use as reagents for preparing di-and tri-metal compounds
- 1 January 1991
- journal article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 1,p. 93-99
- https://doi.org/10.1039/dt9910000093
Abstract
Treatment of thf (tetrahydrofuran) solutions of the salts [W(CR)(CO)2{HC(pz)3}][BF4][R = Me or C6H4Me-4, HC(pz)3= tris(pyrazol-1-yl)methane] with LiBu, followed by BF3·Et2O, affords the neutral alkylidynetungsten complexes [W(CR)(CO)2{(F3B)C(pz)3}]. The species with R = Me was also prepared from the reaction between [W(CMe)Br(CO)4] and Li[(F3B)C(pz)3] in thf. The compounds [W(CMe)(CO)2{(F3B)C(pz)3}] and [Pt(nb)(PMe2Ph)2](nb = norbornene = bicyclo[2.2.1]heptene) react in thf to yield the dimetal complex [WPt(µ-CMe)(CO)2(PMe2Ph)2{(F3B)C(pz)3}], and the latter with [AuR(tht)](R = Cl or C6F5, tht = tetrahydrothiophene) or CuCl in CH2Cl2, yields the trimetal species [WPtMR(µ3-CMe)(CO)2(PMe2Ph)2{(F3B)C(pz)3}](M = Au, R = Cl or C6F5; M = Cu, R = Cl), respectively. Addition of [Pt(cod)2](cod = cycloocta-1,5-diene) to a thf solution of [W(CMe)(CO)2{(F3B)C(pz)3}] gives a chromatographically separable mixture of the compounds [WPt(µ-CMe)(CO)2-(cod){(F3B)C(pz)3}], [W2Pt(µ-CMe)2(CO)4{(F3B)C(pz)3}2] and [WPt2(µ3-CMe)(CO)2(cod)2{(F3B)C-(pz)3}]. The complexes [WPt(µ-CC6H4Me-4)(CO)2(cod){(F3B)C(pz)3}] and [WPt2(µ3-CC6H4Me-4)-(CO)2(cod)2{(F3B)C(pz)3}] have been similarly obtained from [Pt(cod)2] and [W(CC6H4Me-4)(CO)2{(F3B)C(pz)3}]. Treatment of the latter with [Pt(nb)3] in thf affords the trimetal compound [W2Pt(µ-CC6H4Me-4)2(CO)4{(F3B)C(pz)3}2]. The NMR data (1H, 13C-{1H} and 31P-{1H}) for the new compounds are reported and discussed.Keywords
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