Preparations and reactions of bis(η-cyclopentadienyl) compounds containing covalent aluminium–molybdenum or –tungsten bonds

Abstract

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.