Reversible ethylene fixation in lanthanide chemistry is demonstrated by the SmII derivatives [R8-calix-pyrrole)(Et2O)Sm{Li(thf)2}{Li(μ3-OCH=CH2)}] (R=Et, {−(CH2)5−}0.5), which react with ethylene to afford the corresponding dinuclear complexes (see picture).
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Dubé et al. (1999) studied this question.