Reductive trapping of the cyclooctatetraenyl dianion (COT) by treatment of [Sm(DippForm)(thf)] (DippFormH = ,'-bis(2,6-diisopropylphenyl)formamidine; thf = tetrahydrofuran) with 1,3,5,7-cyclooctatetraene (CH) in toluene yields an inverse sandwich dinuclear complex [Sm(DippForm)(COT)] (1), but [Sm(DippForm)(COT)(thf)] (2) and [Sm(DippForm)(O-CH-DippForm)(thf)] (3) in thf, and 1 yields 2 and 3 on treatment with thf.
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