title: Easy preparation of Cp*-functionalized N-heterocyclic carbenes and their coordination to rhodium and iridium.
abstract: A simple high-yielding method for the preparation of a tetramethylcyclopentadienyl-NHC ligand is described. This ligand has been successfully coordinated to Rh and Ir. A related Cp*-NHC ligand with a -CH(2)CMePh- linker between the Cp* and the NHC is also described, together with its coordination to Rh and Ir. This latter ligand, affords the orthocyclometallation of the phenyl ring yielding a constrained structure in which the ligand is tridentate. All the complexes have been fully characterized and their crystal structures are described. Preliminary catalytic results on the beta-alkylation of secondary alcohols and N-alkylation of aniline with primary alcohols are also reported.
authors.affiliation: Instituto de Tecnología Química e Biológica da Universidade Nova de Lisboa, Quinta do Marquês, EAN, Apt. 127, 2781-901, Oeiras. Portugal.
authors.forename: André Pontes
authors.initials: AP
authors.lastname: da Costa
authors.forename: Mercedes
authors.initials: M
authors.lastname: Sanaú
authors.forename: Eduardo
authors.initials: E
authors.lastname: Peris
authors.forename: Beatriz
authors.initials: B
authors.lastname: Royo
mesh_terms: D018360:Crystallography, X-Ray; D003517:Cyclopentanes / Q000737:chemistry*; D006571:Heterocyclic Compounds / Q000737:chemistry*; D007495:Iridium / Q000737:chemistry*; D008024:Ligands; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D012238:Rhodium / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D003517:Cyclopentanes; D006571:Heterocyclic Compounds; D008024:Ligands; D009942:Organometallic Compounds; C030011:carbene; D007495:Iridium; D012238:Rhodium; D008697:Methane