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ChemInform Abstract The reaction of the Sm compound (I) with an excess of AlMe3 (II) yields the binuclear title complex (III). THF cleaves the bridging AlMe4 units in (III) liberating AlMe3 and the mononuclear title complex (V). The structures of (III) (space group P21/n, Z=2) and (V) (Pnma, Z=4) are determined by X-ray analysis. (V) reacts with aromatic and aliphatic hydrocarbons including benzene, toluene, hexane, cyclohexanes, cyclooctane liberating methane via net activation of C-H bonds. With toluene e.g. the benzyl derivative (VII) is formed. The methane generated in the reactions of (V) with deuterated substrates is CH4, which suggests that intramolecular formation of a spectroscopically undetected intermediate containing a metalated C5Me5 ring may occur before intermolecular reaction with the C-H bond. (V) metalates pyridine-d5 to form CH3D, reacts with Et2O to give the ethoxo derivative of (V), and reacts with H2 to form ((C5Me5)2Sm(µ-H))2. Both (III) and (V) polymerize ethylene.

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