A dianionic lanthanoid(II)−imine azametallacyclopropane complex, [Yb(η 2 -Ph 2 CNPh)(hmpa) 3 ] (hmpa = hexamethylphosphoramide), has been directly synthesized by the reaction of ytterbium metal with N -(diphenylmethylidene)aniline in THF/HMPA and structurally characterized by X-ray analysis.
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Makioka et al. (1996) studied this question.
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