title: Low-valent iron(i) amido olefin complexes as promotors for dehydrogenation reactions.
abstract: Fe(I) compounds including hydrogenases show remarkable properties and reactivities. Several iron(I) complexes have been established in stoichiometric reactions as model compounds for N2 or CO2 activation. The development of well-defined iron(I) complexes for catalytic transformations remains a challenge. The few examples include cross-coupling reactions, hydrogenations of terminal olefins, and azide functionalizations. Here the syntheses and properties of bimetallic complexes [MFe(I) (trop2 dae)(solv)] (M=Na, solv=3 thf; M=Li, solv=2 Et2 O; trop=5H-dibenzo[a,d]cyclo-hepten-5-yl, dae=(N-CH2 -CH2 -N) with a d(7) Fe low-spin valence-electron configuration are reported. Both compounds promote the dehydrogenation of N,N-dimethylaminoborane, and the former is a precatalyst for the dehydrogenative alcoholysis of silanes. No indications for heterogeneous catalyses were found. High activities and complete conversions were observed particularly with [NaFe(I) (trop2 dae)(thf)3 ].
authors.affiliation: Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich (Switzerland). lichtenberg@inorg.chem.ethz.ch.
authors.forename: Crispin
authors.initials: C
authors.lastname: Lichtenberg
authors.forename: Liliana
authors.initials: L
authors.lastname: Viciu
authors.forename: Mario
authors.initials: M
authors.lastname: Adelhardt
authors.forename: Jörg
authors.initials: J
authors.lastname: Sutter
authors.forename: Karsten
authors.initials: K
authors.lastname: Meyer
authors.forename: Bas
authors.initials: B
authors.lastname: de Bruin
authors.forename: Hansjörg
authors.initials: H
authors.lastname: Grützmacher
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D000577:Amides / Q000737:chemistry*; D002384:Catalysis; D004987:Ethers / Q000138:chemical synthesis* / Q000737:chemistry; D006865:Hydrogenation; D058085:Iron Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D015394:Molecular Structure; D012821:Silanes / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000475:Alkenes; D000577:Amides; D004987:Ethers; D058085:Iron Compounds; D012821:Silanes
keywords: aminoboranes; condensation reactions; dehydrogenation; heterometallic complexes; low-valent iron.