Models get choosey: Structurally characterized mono- and dicationic yttrium methyl complexes (3 and 4) are accessible by protonolysis of the hexamethylate complexes (1 and 2) and function as models for the homogeneous catalysts for 1,4-cis-selective polymerization of 1,3-dienes by the industrially applied multicomponent catalyst.
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Arndt et al. (2005) studied this question.
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