title: Neutral Fe(IV) alkylidenes, including some that bind dinitrogen.
abstract: Neutral, formally Fe(IV) alkylidene species are sought as plausible olefin metathesis catalysts, and the synthesis of several is described herein. The complexes are prepared via nucleophilic attack (Nu = MeLi, PhCH2K, 2-picolyllithium, Me2PCH2Li, MePhPCH2Li, Ph2PCH2Li) at the imine of cationic [mer-{κ-C,N,C-(C6H4-yl)-2-CH=N(2-C6H4-C(iPr)=)}Fe(PMe3)3][B(3,5-CF3-C6H3)4]. In contrast, MeMgCl and mesityllithium displaced and deprotonated bound PMe3, respectively. Structural details are provided for mer-{κ-C,N,C-(C6H4-yl)-2-CH(Bn)N(2-C6H4-C(iPr))}Fe{trans-(PMe3)2}N2 and {κ-C,N,C,P-(C6H4-yl)-2-CH(CH2PMe2)N(2-C6H4-C(iPr)=)}Fe(PMe3)2.
authors.affiliation: Department of Chemisty & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, USA. ptw2@cornell.edu.
authors.forename: Brian M
authors.initials: BM
authors.lastname: Lindley
authors.forename: Brian P
authors.initials: BP
authors.lastname: Jacobs
authors.forename: Samantha N
authors.initials: SN
authors.lastname: MacMillan
authors.forename: Peter T
authors.initials: PT
authors.lastname: Wolczanski