Preparations and reactions of bis(η-cyclopentadienyl) compounds containing covalent aluminium–molybdenum or –tungsten bonds
The dihydride [Mo(η-C5H5)2H2] reacts with AlMe3 to give compounds (II) and (III) containing Mo–Al bonds. Compound (II) reacts with allyl chloride to give the compound [Mo(η-C3H5)(η-C5H5)2][PF6]. Following treatment of compound (II) with carbon dioxide, the carbonyl compound [MoBr(η-C5H5)2(CO)][PF6] may be isolated. The dihydride [W(η-C5H5)2H2] reacts with AlMe3 to give a related tungsten–aluminium compound. The compounds and reactions are discussed.