José Barluenga, Fernándo Aznar, M. Ángel Palomero,
... Se han preparado varios ejemplos de complejos dienil carbeno de Fischer estables, de cromo y de volframio, ... reacción de cicloadición [3+2] entre alqueniletinil complejos carbeno y nitronas o diazoalcanos. El tratamiento de estos ... la preparación de naftoisoxazoles a partir de ariletinil carbenos de Fischer. La ruptura en condiciones reductoras del ...
Tópico(s): N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
2001 - Wiley | Chemistry - A European Journal
Christian J. Kastrup, Steven P. Oldfield, Henry S. Rzepa,
... of atomic orbitals and a novel 8-pi carbeno[8]heteroannulene ring system 1 where the Hückel ...
Tópico(s): Synthesis and characterization of novel inorganic/organometallic compounds
2002 - Royal Society of Chemistry | Chemical Communications
José Barluenga, Manuel A. Fernández‐Rodríguez, Enrique Aguilar, Félix Fernández-Marı́, Alejandro Salinas, Bernardo Olano,
... situ, origina los correspondientes cicloaductos como tetracarbonil complejos carbeno de Fischer quelados. En todos los casos se ... reacción es muy elevada cuando se utilizan complejos carbeno derivados de (−)-8-fenilmentol. La oxidación y posterior ...
Tópico(s): Catalytic Alkyne Reactions
2001 - Wiley | Chemistry - A European Journal
Tomonori Enyo, Athanassios Nicolaides, Hideo Tomioka,
m-Phenylene-coupled carbenonitrenes [(3-nitrenophenyl)methylene (2-H), (3-nitrenophenyl)fluoromethylene (2-F), (3-nitrenophenyl)chloromethylene (2-Cl), (3-nitrenophenyl)bromomethylene (2-Br)] have been investigated computationally (with B3LYP, MCSCF, CASPT2, ROMP2, and QCISD(T) methods) and experimentally (with IR, UV, and ESR spectroscopy). For each species, five electronic states were considered. At the highest level of theory explored, the parent compound (2-H) has a quintet ground state, but its halogen ...
Tópico(s): Photochemistry and Electron Transfer Studies
2002 - American Chemical Society | The Journal of Organic Chemistry
Produção Nacional
Revisado por pares
Julio Cezar Pastre, Carlos Roque D. Correia,
AND COMPARISON WITH OTHER CATALYSTS.N-heterocyclic carbenes (NHCs) have become of considerable importance in modern organometallic chemistry and homogeneous catalysis.There are several advantages in the use NHCs over their phosphorus analogues, which explains the enormous development of NHC ligands in the field of organometallic catalysis in the past few years.In this article, we present an overview of the importance of the catalysts containing NHC ligands, their synthesis, some pertinent synthetic ...
Tópico(s): Phosphorus compounds and reactions
2008 - Brazilian Chemical Society | Química Nova
José Barluenga, Salomé López, Andrés A. Trabanco, Josefa Flórez,
... de complejos 2-haloetoxi- o 3-cloropropoxi(alquenil)carbeno de cromo con alquenos electrónicamente neutros condujo a ...
Tópico(s): Coordination Chemistry and Organometallics
2001 - Wiley | Chemistry - A European Journal
Produção Nacional
Revisado por pares
Maria Beatriz S. Mota, Nilton Rosenbach, Cláudio J. A. Mota,
Foi realizado um estudo teórico da inserção de carbenos (CH 2 e CHCHO) na estrutura cristalina da ... metileno na rede cristalina, independentemente da multiplicidade do carbeno (singlete ou triplete).A inserção na ligação O- ... feita na zeólita desprotonada.A inserção do formil-carbeno (CHCHO) cria centros quirais na estrutura cristalina.A acidez da zeólita após a inserção dos carbenos foi calculada usando a energia de desprotonação.Os ...
Tópico(s): Catalysis for Biomass Conversion
2014 - Brazilian Chemical Society | Journal of the Brazilian Chemical Society
Tópico(s): Coordination Chemistry and Organometallics
1978 - Elsevier BV | Organic chemistry
Julio Cezar Pastre, Correia C.R.D.,
Tópico(s): Asymmetric Hydrogenation and Catalysis
2008 - Institute of Electrical and Electronics Engineers | Scopus
Produção Nacional
Revisado por pares
João Bosco P. da Silva, Benício B. Neto, Mozart N. Ramos,
THE C n NH (n= 1, 3 and 5) CARBENES.This work reviews some applications of ab initio molecular orbital calculations to the elucidation of structures of interstellar molecules.The case of the C n NH (n=1, 3 and 5 ) carbenes is extensively analyzed and discussed.Theoretical conformational analysis and predicted values for the rotational constants and dipole moments of the singlet state of C 5 NH are reported for the first time and a comparison is performed with results previously obtained for C 3 NH and ...
Tópico(s): Advanced Chemical Physics Studies
1997 - Brazilian Chemical Society | Química Nova
Tópico(s): Chemistry and Chemical Engineering
2017 - | Revista Boliviana de Química
Éric Bordas, Javier Romañach Cabrero, Christien de Graaf, Juan Francisco Juliá Igual, María Silvana Nessar Reguero, Rosa Caballol,
... con metales alcalinos, de separaciones singulete-triplete en carbenos y en el tetrametilenetano, asi como de constantes ...
Tópico(s): Advanced Chemical Physics Studies
2007 - Association of Chemists of the Chemical Institute of Sarria | Afinidad
Janeth Navarro, Marta Martı́n, Eduardo Sola,
... uma nova tautomerização do hidreto de alquenil a carbeno foi proposta.The known iridium(III) hydrides [IrH ...
Tópico(s): Chemical Synthesis and Analysis
2014 - Brazilian Chemical Society | Journal of the Brazilian Chemical Society
José Francisco Delgado Reyes, Alberto Feliciano, Miguel Á. Vázquez, Iván Velazco‐Cabral, Juan Luis Vázquez, Luis J. Benítez‐Puebla, Salvador Mastachi, Selene Lagunas‐Rivera, Marco A. García‐Revilla,
... process. Resumen. Se reporta la reactividad entre el carbeno de Fischer (CO)5Cr=C(OEt)CºCPh y ...
Tópico(s): Asymmetric Hydrogenation and Catalysis
2024 - Mexican Chemical Society | Journal of the Mexican Chemical Society
L.Suarez Carbeño, J.L. Alvarez-Sala Moris,
1944 - Elsevier BV | Revista Clínica Española