Simple routes to mono(.eta.5-pentamethylcyclopentadienyl) complexes of molybdenum(V) and tungsten(V)

Chelated η5-cyclopentadienyl-η-ethyl complexes of molybdenum and tungsten; molecular structure of W(η5-C5H4CH2-η-CH2)(CO)3

“…NaH (Aldrich), cyclopentadiene (Aldrich), 1,2-dibromoethane (Aldrich), tetrafluoroboric acidether complex (Aldrich) and Silica-gel (Fluka) were used as received. IR spectra were recorded in CaF 2 13 C were referenced internally using the residual solvent resonance signals and reported relative to tetramethylsilane. 19 F spectra were referenced externally to CFCl 3 .…”

“…It has been reported that oxidation of low valent Group 6 metal carbonyl complexes with phosphorous pentachloride [13] is a convenient route to high valent metal (V) and (VI) chloro complexes, whereas oxidation using iodobenzene dichloride [14] is a more convenient route to chloro complexes in lower oxidation states.…”

Synthesis and reactivity of cyclopentadienyl chloro, imido and alkylidene tungsten (VI) complexes

“…A useful method to prepare cyclopentadienyl tungsten(V) chlorides is the oxidation of low valent tungsten carbonyl compounds with PCl 5 [9]. We recently reported [5] the synthesis of WCp*Cl 4 [10] 1 by oxidation of [WCp*(CO) 2 ] 2 with an excess of PCl 5 in toluene.…”

“…(9) WCp*(N t Bu)(O)(CH 2 Ph) 10 and toluene. Complex 10 was isolated as a microcrystalline yellow solid in quantitative yield and characterized by elemental analysis and 1 H-, 13 C-NMR spectroscopy.…”

Preparation of imido pentamethylcyclopentadienyl molybdenum(IV) complexes X-ray molecular structure of cis-[MoCp* Cl(μ-NtBu)]2 · C6H6

“…The molybdenum(V) tetrachlorides [MoCp'C14] (Cp' = CsH 5 (Cp), CsMe 5 (Cp*)) were prepared in more than 90% yield by a modification of the method previously reported [6] by Schrock and coworkers which involves the oxidation of [MoCp'(CO)2] 2 or (1997) [27][28][29][30][31][32][33] [MoCp'(CO) 2 ]2 or any mixture of them with an excess of PC15 in toluene.…”