Gold Catalysts with Polyaromatic-NHC ligands. Enhancement of Activity by Addition of Pyrene
Metadatos
Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/160292
comunitat-uji-handle3:10234/160293
comunitat-uji-handle4:
INVESTIGACIONEste recurso está restringido
http://dx.doi.org/10.1021/acs.organomet.7b00172 |
Metadatos
Título
Gold Catalysts with Polyaromatic-NHC ligands. Enhancement of Activity by Addition of PyreneFecha de publicación
2017Editor
American Chemical SocietyISSN
0276-7333; 1520-6041Cita bibliográfica
Gold Catalysts with Polyaromatic-NHC ligands. Enhancement of Activity by Addition of Pyrene Susana Ibáñez, Macarena Poyatos, and Eduardo Peris Organometallics 2017 36 (7), 1447-1451 DOI: 10.1021/acs.organomet.7b00172Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://pubs.acs.org/doi/abs/10.1021/acs.organomet.7b00172Resumen
Three Au(I) complexes with N-heterocyclic carbene ligands
fused to polycyclic aromatic hydrocarbons (pyrene and phenanthrophenazine)
have been obtained and fully characterized. The complexes were tested
as catalysts ... [+]
Three Au(I) complexes with N-heterocyclic carbene ligands
fused to polycyclic aromatic hydrocarbons (pyrene and phenanthrophenazine)
have been obtained and fully characterized. The complexes were tested
as catalysts in the hydroamination of terminal alkynes, where they showed
moderate to good activity. The addition of a catalytic amount of pyrene to the
reaction mixtures produced an improvement in the performance of the
catalysts. The study of the reaction order of the catalyst in this reaction
indicated that the order is 0.5, indicating that an off-cycle inactive catalyst
dimer is formed, as consequence of the self-association of the complex by π−π
stacking interactions. The reaction order in catalyst when pyrene is added to
the reaction mixture is 1 > n > 0.5, therefore being higher than that in the
absence of pyrene. Studies made by 1
H NMR spectroscopy demonstrate that
an important self-association of the catalyst occurs at the concentrations used
in the catalytic reactions. The association of pyrene with the catalyst was also
observed and quantified by 1
H NMR titrations. The studies allowed us to conclude that pyrene influences the activity of the
Au(I) catalysts due to reasons related to the modification of the reaction order in the catalyst rather than to allosteric issues. [-]
Publicado en
Organometallics 2017, 36, 1447−1451Derechos de acceso
© 2017 American Chemical Society
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/restrictedAccess
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/restrictedAccess
Aparece en las colecciones
- INAM_Articles [506]