An unprecedented oxidation of chromium(II) by trimethylaluminum which, despite the reducing environment, forms a cationic organochromium(III) complex (see picture; SNS=RSCH2CH2N(H)CH2CH2SR, Cy=cyclohexyl, X=[Me6Al2Cl]), provides a possible catalyst re-activation pathway.
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Temple et al. (2006) studied this question.
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