Selected PNP and SNS ethylene trimerization ligands have been coordinated to Cr II and Cr III, and further reactions of these complexes have been studied. The ligands are easily deprotonated to afford monoanionic tridentate ligands. All prepared complexes gave ethylene trimerization catalysis with varying degrees of activity upon activation with both MAO and AlR 3 /B(C 6 F 5 ) 3 . The results of this study show that the role of MAO during activation is one of deprotonation, Cr reduction, and cation generation. A Cr II → Cr IV cationic mechanism is suggested.
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McGuinness et al. (2006) studied this question.
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