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In the cobalt-catalyzed hydroformylation of olefins, [CoH(CO)3] is supposed to be the catalytically active species, formed out of the pre-catalyst [CoH(CO)4]. Suggest an experiment that can support the existence of [CoH(CO)3] within the catalytic cycle. Explain, why the reaction rate of the hydroformylation process decreases when the CO ligands in complexes [CoH(CO)4-n(PR3)n] are successively substituted by phosphine ligands. Which trend would you expect for the CO stretching frequencies in the IR spectrum and for the acidity of [CoH(CO)4-n(PR3)n] in the course of CO substitution by phosphine?
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