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Self-help groups: The aluminatopyrrolyl complexes η5-2, 3, 4, 5-Me4C4N (AlClMe2) 2Cr and η5-2, 3, 4, 5-Me4C4N (AlClMe2) CrMe (μ-NPh) 2AlMe2Me3Al (thf) self-activate to give single-site ethylene polymerization catalysts. The closely related dinuclear chromium (II) complex η5-2, 3, 4, 5-Me4C4N (AlClMe2) Cr2 (μ-Me) 2 (see picture) is a highly active self-activating ethylene trimerization catalyst.
Vidyaratne et al. (Mon,) studied this question.
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