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With complexes of iridium as catalysts, induction periods are typical for homogeneous hydrogenation of olefins in bulk. The induction period decreases, as a rule with increasing activity, at higher temperatures and may be suppressed with dibenzoylperoxide, azobisisobutyrodinitrile, tetrachloro-1,4-benzoquinone or by preactivation. Triethylamin and SnCl 2  · 2H 2 O are unsuitable additives. The operation “preactivation” leads additionally to great substrate/catalyst-turnover numbers.

zeitschrift für naturforschung b

Abbau von Induktionsperioden und Steigerung der Aktivität homogener Hydrierungskatalysatoren mit Iridium als Zentralatom / Reduction of Induction Periods and Increase of Activity of Homogenous Iridium Hydrogenation Catalysts