Abstract
AbstractThe influence of substituents in ButiPhane ligands (with R=Me, Et, iPr) on the hydrogenation activity and selectivity of the corresponding rhodium complexes has been quantitatively assessed. Increasingly demanding substituents negatively affect the reduction rate of 1,5‐cyclooctadiene in catalyst precursors en route to catalytically active MeOH–solvent complexes. The same trend as to activity is observed in the hydrogenation of prochiral olefins [methyl‐(Z)‐α‐acetamidocinnamate, methyl (Z)‐3‐N‐acetylamino‐3‐methylacrylate, and methyl (Z)‐3‐N‐acetylamino‐3‐phenylacrylate], which however is counterbalanced by an increase in the stereorecognition ability of the bulkier catalysts.
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