RT info:eu-repo/semantics/article
T1 Protection of the gold (I) Catalyst by AsPh3 in Reactions of Enynes
A1 Ramiro Mangas, Zoraida Rosa
A1 Bartolomé Albistegui, María del Camino
A1 Espinet Rubio, Pablo
K1 Carbene ligands
K1 Arsenic
AB HBHC (Hydrogen Bond supported Heterocyclic Carbene) and NAC (Nitrogen Acyclic Carbene) neutral gold complexes have been synthesized by reaction of isocyanogold derivatives ([AuCl(CNR)] with amines. Cationic complexes [Au(carbene)(AsPh3)](SbF6) have been also prepared. The catalytic activity of both types of complex (for the former AgSbF6 is used to extract the halide) in skeletal rearrangement and methoxycyclization of enynes has been studied. The cationic complexes with AsPh3 are active but slower; as an advantage they do not decompose during the catalysis. In contrast, the catalysts formed in situ from the halide neutral complexes are very fast but undergo decomposition. An interesting trade-off was found by adding sub-stoichiometric amounts of AsPh3 (e.g. 10 mol%) relative to the gold catalyst ([Au(carbene)Cl] + AgSbF6), which prevents or dramatically reduces the decomposition observed. This protecting ligand promises to prevent or minimize undesired decomposition of gold catalysts.
PB Wiley-VCH Verlag
SN 1434-1948
YR 2014
FD 2014
LK http://uvadoc.uva.es/handle/10324/21727
UL http://uvadoc.uva.es/handle/10324/21727
LA eng
NO European Journal of Inorganic Chemistry, 2014, vol. 2014, Issue 32, p.  5499–5506
NO Producción Científica
DS UVaDOC
RD 25-nov-2024