The combination of Ir, which has a strong affinity for carbonyl groups, with an acid H‐β zeolite as a support and promotor, provides an effective catalyst for the chemoselective hydrogenation of α,β‐unsaturated aldehydes and ketones to the corresponding allylic alcohols. Steroidal enones are suitable substrates for this transformation (see scheme). R=CH(Me)(CH2)3CH(Me)2.
Durch Kombination von Iridium, das eine hohe Affinität für Carbonylgruppen aufweist, mit einem sauren H‐β‐Zeolith als Träger‐ und Promotormaterial erhält man einen effektiven Katalysator für die chemoselektive Hydrierung von α,β‐ungesättigten Aldehyden und Ketonen zu den entsprechenden Allylalkoholen. Steroid‐Enone bieten sich als Substrate für diese Umwandlung an (siehe Schema; R=CH(Me)(CH2)3CH(Me)2).
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