High-Activity Iron Catalysts for the Hydrogenation of Hindered, Unfunctionalized Alkenes
Renyuan Pony Yu1, Jonathan M Darmon1, Jordan M Hoyt1
1Department of Chemistry, Princeton University, Princeton, New Jersey, U. S. A. 08544.
Abstract:
The activity of aryl-substituted bis(imino)pyridine and bis(arylimidazol-2-ylidene)pyridine iron dinitrogen complexes has been evaluated in a series of catalytic olefin hydrogenation reactions. In general, more electron donating chelates with smaller 2,6-aryl substituents produce more active iron hydrogenation catalysts. Establishment of this structure-activity relationship has produced base metal catalysts that exhibit high turnover frequencies for the hydrogenation of unfunctionalized, tri- and tetrasubstituted alkenes, one of the most challenging substrate classes for homogenous hydrogenation catalysts.
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