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Abstract magnified image During the asymmetric hydrogenation of itaconic acid with rhodium solvate complexes of the type [Rh(PP)(MeOH) 2 ] BF 4 (PP=DIPAMP, Me‐DuPHOS) a deactivation with increasing substrate concentration is observed. It is shown that this inhibition phenomenon is due to the in situ formation of an inactive rhodium(III)‐alkyl complex. Two crystal structures of single crystals of the responsible complexes ( 1 ) and ( 2 ) support the deactivation pathway.
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Schmidt et al. (2009) studied this question.
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