title: Breaking and Making of Carbon-Carbon Bonds by Lanthanides and Third-Row Transition Metals.
abstract: Carbon-atom extrusion from the ipso-position of a halobenzene ring (C6 H5 X; X=F, Cl, Br, I) and its coupling with a methylene ligand to produce acetylene is not confined to [LaCH2 ](+) ; also, the third-row transition-metal complexes [MCH2 ](+) , M=Hf, Ta, W, Re, and Os, bring about this unusual transformation. However, substrates with substituents X=CN, NO2 , OCH3 , and CF3 are either not reactive at all or give rise to different products when reacted with [LaCH2 ](+) . In the thermal gas-phase processes of atomic Ln(+) with C7 H7 Cl substrates, only those lanthanides with a promotion energy small enough to attain a 4f(n) 5d(1) 6s(1) configuration are reactive and form both [LnCl](+) and [LnC5 H5 Cl](+) . Branching ratios and the reaction efficiencies of the various processes seem to correlate with molecular properties, like the bond-dissociation energies of the C-X or M(+) -X bonds or the promotion energies of lanthanides.
authors.affiliation: Institut für Chemie, Technische Universität Berlin, 10623, Berlin, Germany.
authors.forename: Shaodong
authors.initials: S
authors.lastname: Zhou
authors.affiliation: Institut für Chemie, Technische Universität Berlin, 10623, Berlin, Germany.|Institute of Theoretical Chemistry, Jilin University, Changchun, 130023, P. R. China.
authors.forename: Jilai
authors.initials: J
authors.lastname: Li
authors.affiliation: Institut für Chemie, Technische Universität Berlin, 10623, Berlin, Germany.
authors.forename: Maria
authors.initials: M
authors.lastname: Schlangen
authors.affiliation: Institut für Chemie, Technische Universität Berlin, 10623, Berlin, Germany. Helmut.Schwarz@tu-berlin.de.
authors.forename: Helmut
authors.initials: H
authors.lastname: Schwarz
keywords: bond activation; extrusion reactions; gas-phase chemistry; metal carbenes; transition metals