SYNTHESIS OF TRICARBONYL-ETA-5-CYCLOHEXADIENYLTUNGSTENATE AND TRICARBONYL-ETA-5-CYCLOHEXADIENYLMETHYLTUNGSTEN

eta-6-Arene-tricarbonyl-tungsten (arene = benzene (1A), toluene (1B), m-xylene (1C), p-xylene (1D), o-xylene (1E), mesitylene (1F) yield with potassium-tri-sec-butylboranate correspondingly methyl-substituted tricarbonyl-eta-5-cyclohexadienyl-tungstates (2A-2F). Similarly 1A reacts with methyllithium to tricarbonyl-eta-5-anti-6-methylcyclohexadienyl-tungstate (4A). In THF 2A-2F and 4A are converted by methyliodide to tricarbonyl-eta-5-cyclohexadienyl-methyl-tungsten (3A-3F) and tricarbonyl-eta-5-anti-6-methylcyclohexadienyl-methyl-tungsten (5A). The complexes were characterized by C, H elemental analyses and by IR and H-1-NMR spectroscopy.