title: Chemoselective hydrogenation of functionalized nitroarenes and imines by using carbon nanofiber-supported iridium nanoparticles.
abstract: The reaction of three types of carbon nanofibers (CNFs; platelet: CNF-P, tubular: CNF-T, herringbone: CNF-H) with Ir4(CO)12 in mesitylene at 165 °C provided the corresponding CNF-supported iridium nanoparticles, Ir/CNFs (Ir content=2.3-2.6 wt.%). Transmission electron microscopy (TEM) studies of these Ir/CNF samples revealed that size-controlled Ir nanoparticles (average particle size of 1.1-1.5 nm) existed on the CNFs. Among the three Ir/CNF samples, Ir/CNF-T showed an excellent catalytic activity and chemoselectivity towards hydrogenation of functionalized nitroarenes and imines; the corresponding aniline derivatives were obtained with high turnover numbers at ambient temperature under 10 tm of H2 , and the catalyst is reusable. Ir/CNF-T was also effective for the reductive N-alkylation of anilines with carbonyl compounds.
authors.affiliation: Toyota Technological Institute, Nagoya, Aichi 468-8511 (Japan), Fax: (+81) 52-809-1721. motoyama@toyota-ti.ac.jp.
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Motoyama
authors.forename: Masahiro
authors.initials: M
authors.lastname: Taguchi
authors.forename: Nelfa
authors.initials: N
authors.lastname: Desmira
authors.forename: Seong-Ho
authors.initials: SH
authors.lastname: Yoon
authors.forename: Isao
authors.initials: I
authors.lastname: Mochida
authors.forename: Hideo
authors.initials: H
authors.lastname: Nagashima
keywords: carbon nanofibers; heterogeneous catalysis; hydrogenation; imines; nitroarenes