title: High-Activity Iron Catalysts for the Hydrogenation of Hindered, Unfunctionalized Alkenes.
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.
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey, U. S. A. 08544.
authors.forename: Renyuan Pony
authors.initials: RP
authors.lastname: Yu
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey, U. S. A. 08544.
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Darmon
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey, U. S. A. 08544.
authors.forename: Jordan M
authors.initials: JM
authors.lastname: Hoyt
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey, U. S. A. 08544.
authors.forename: Grant W
authors.initials: GW
authors.lastname: Margulieux
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey, U. S. A. 08544.
authors.forename: Zoë R
authors.initials: ZR
authors.lastname: Turner
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey, U. S. A. 08544.
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Chirik
keywords: Iron; N-heterocyclic carbene; catalysis; hydrogenation