title: Efficient catalysis of Nazarov cyclization using a cationic iridium complex possessing adjacent labile coordination sites.
abstract: The dicationic Ir(III) complex [IrMe(CO)(dppe)(DIB)](BARF)2 having adjacent labile sites has been found to be a very effective catalyst for promoting the Nazarov cyclization of aryl vinyl and divinyl ketones. Spectroscopic evidence for a substate-catalyst complex before cyclization is presented. The efficiency of the cyclization is attributed to the electrophilicity of the Ir(III) complex and substrate activation via chelation.
authors.affiliation: Department of Chemistry, University of Rochester, Rochester, New York 14627, USA.
authors.forename: Mesfin
authors.initials: M
authors.lastname: Janka
authors.forename: Wei
authors.initials: W
authors.lastname: He
authors.forename: Alison J
authors.initials: AJ
authors.lastname: Frontier
authors.forename: Richard
authors.initials: R
authors.lastname: Eisenberg