Home About us Contact
|
Home About us Contact | ||
|
|
||
Fischer Carbene Complexes (fischer + carbene_complex)
Selected AbstractsChemInform Abstract: Synthesis of Naphthalenes Through Three-Component Coupling of Alkynes, Fischer Carbene Complexes, and Benzaldehyde Hydrazones via Isoindole Intermediates.CHEMINFORM, Issue 37 2008Shaofeng Duan Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Thermal and Photochemical Reactions of Fischer Carbene Complexes with Trialkylsilyl-Substituted Alkynes.CHEMINFORM, Issue 24 2008Zhi Li Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: A General and Regioselective Synthesis of Cyclopentenone Derivatives Through Nickel(0)-Mediated [3 + 2] Cyclization of Alkenyl Fischer Carbene Complexes and Internal Alkynes.CHEMINFORM, Issue 14 2008Jose Barluenga Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Reactions of Alkenyl Fischer Carbene Complexes with Ketene Acetals: Formation of Alkynes.CHEMINFORM, Issue 12 2007Siu Ling B. Wang Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Diastereoselective Multicomponent Cyclizations of Fischer Carbene Complexes, Lithium Enolates, and Allylmagnesium Bromide Leading to Highly Substituted Five- and Six-Membered Carbocycles.CHEMINFORM, Issue 3 2007Jose Barluenga Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Nickel-Catalyzed [3 + 1 + 1] Cycloaddition Reactions of Alkenyl Fischer Carbene Complexes with Methylenecyclopropanes.CHEMINFORM, Issue 2 2007Ken Kamikawa Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] A Simple Procedure for the Synthesis of Functionalized 1,3-Butadienes and Cyclopentenones from Fischer Carbene Complexes.CHEMINFORM, Issue 52 2006Francisco J. Fananas Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Role of Imino Group in Photochemical Reactions of Fischer Carbene Complexes.CHEMINFORM, Issue 25 2006Pedro J. Campos Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] An Efficient Route to Tetrahydronaphthols via Addition of ortho-Lithiated Stilbene Oxides to ,,,-Unsaturated Fischer Carbene Complexes.CHEMINFORM, Issue 8 2006Vito Capriati Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access the actual ChemInform Abstract, please click on HTML or PDF. [source] Asymmetric Synthesis of Cyclopropanes from Lithiated Aryloxiranes and ,,,-Unsaturated Fischer Carbene Complexes.CHEMINFORM, Issue 49 2005Vito Capriati Abstract For Abstract see ChemInform Abstract in Full Text. [source] A New Synthesis of Allyl Sulfoxides via Nucleophilic Addition of Sulfinyl Carbanions to Group 6 Fischer Carbene Complexes.CHEMINFORM, Issue 33 2005Jose Barluenga Abstract For Abstract see ChemInform Abstract in Full Text. [source] Construction of [4.3.1]Propellanes via Molybdenum Fischer Carbene Complexes.CHEMINFORM, Issue 18 2003Thomas M. Bertolini Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: New Reaction Pathways for Fischer Carbene Complexes: [6 + 3] Cycloaddition of Chromium Alkenyl Carbene Complexes with Fulvenes.CHEMINFORM, Issue 10 2002Jose Barluenga Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Transmetalation Reactions from Fischer Carbene Complexes to Late Transition Metals: A DFT StudyCHEMISTRY - A EUROPEAN JOURNAL, Issue 35 2008Israel Fernández Dr. Abstract Transmetalation reactions from chromium(0) Fischer carbene complexes to late-transition-metal complexes (palladium(0), copper(I), and rhodium(I)) have been studied computationally by density functional theory. The computational data were compared with the available experimental data. In this study, the different reaction pathways involving the different metal atoms have been compared with each other in terms of their activation barriers and reaction energies. Although the reaction profiles for the transmetalation reactions to palladium and copper are quite similar, the computed energy values indicate that the process involving palladium as catalyst is more favorable than that involving copper. In contrast to these transformations, which occur via triangular heterobimetallic species, the transmetalation reaction to rhodium leads to a new heterobimetallic species in which a carbonyl ligand is also transferred from the Fischer carbene to the rhodium catalyst. Moreover, the structure and bonding situation of the so far elusive heterobimetallic complexes are briefly discussed. La reacción de transmetalación catalítica desde cromo(0) Fischer carbenos a metales de transición tardía (Pd0, CuIand RhI) se ha estudiado computacionalmente usando DFT. Los resultados computacionales se han comparado con los datos experimentales disponibles. Las barreras y las energías de reacción se han comparado en los caminos de reacción obtenidos para los metales considerados. Mientras que los perfiles de reacción para la transmetalación desde Cr a Pd o Cu son similares, los valores calculados indican que aquellos procesos que implican catalizadores de Pd son más favorables que los que implican Cu. En claro contraste con estas transformaciones, que ocurren a través de especies heterobimetálicas con geometría triangular, la reacción con Rh forma nuevas especies heterobimetálicas en las que se ha transferido un ligando carbonilo desde el complejo de Fischer al catalizador de Rh. Adicionalmente, se discute la estructura y la forma de enlace de éstos complejos heterobimetálicos no aislados hasta este momento. [source] Electrospray mass spectra of group 6 (Fischer) carbenes in the presence of electron-donor compoundsJOURNAL OF MASS SPECTROMETRY (INCORP BIOLOGICAL MASS SPECTROMETRY), Issue 2 2003M. A. Sierra Abstract Fischer carbene complexes 1,7 are not ionized under standard electrospray ionization (ESI) conditions. We report here that unsaturated chromium and tungsten (Fischer) carbene complexes can be ionized in an electrospray ion source in the presence of electron-donor compounds such as hydroquinone (HQ) or tetrathiafulvalene (TTF). The addition of these compounds, which seem to act as electron transfer agents, permits the recording and study of their ESI mass spectra in the negative mode of detection. Both chromium and tungsten(0) carbene complexes undergo in the first fragmentation stage a double simultaneous decarbonylation process. Copyright © 2003 John Wiley & Sons, Ltd. [source] Transmetalation Reactions from Fischer Carbene Complexes to Late Transition Metals: A DFT StudyCHEMISTRY - A EUROPEAN JOURNAL, Issue 35 2008Israel Fernández Dr. Abstract Transmetalation reactions from chromium(0) Fischer carbene complexes to late-transition-metal complexes (palladium(0), copper(I), and rhodium(I)) have been studied computationally by density functional theory. The computational data were compared with the available experimental data. In this study, the different reaction pathways involving the different metal atoms have been compared with each other in terms of their activation barriers and reaction energies. Although the reaction profiles for the transmetalation reactions to palladium and copper are quite similar, the computed energy values indicate that the process involving palladium as catalyst is more favorable than that involving copper. In contrast to these transformations, which occur via triangular heterobimetallic species, the transmetalation reaction to rhodium leads to a new heterobimetallic species in which a carbonyl ligand is also transferred from the Fischer carbene to the rhodium catalyst. Moreover, the structure and bonding situation of the so far elusive heterobimetallic complexes are briefly discussed. La reacción de transmetalación catalítica desde cromo(0) Fischer carbenos a metales de transición tardía (Pd0, CuIand RhI) se ha estudiado computacionalmente usando DFT. Los resultados computacionales se han comparado con los datos experimentales disponibles. Las barreras y las energías de reacción se han comparado en los caminos de reacción obtenidos para los metales considerados. Mientras que los perfiles de reacción para la transmetalación desde Cr a Pd o Cu son similares, los valores calculados indican que aquellos procesos que implican catalizadores de Pd son más favorables que los que implican Cu. En claro contraste con estas transformaciones, que ocurren a través de especies heterobimetálicas con geometría triangular, la reacción con Rh forma nuevas especies heterobimetálicas en las que se ha transferido un ligando carbonilo desde el complejo de Fischer al catalizador de Rh. Adicionalmente, se discute la estructura y la forma de enlace de éstos complejos heterobimetálicos no aislados hasta este momento. [source] | ||||||||||