Gold: A relatively new catalyst

A new normalized relatively stable lattice structure

This paper proposes a new lattice filter structure that has the following properties. When the filter is Linear Time Invariant (LTI), it is equivalent to the celebrated Gray Markel Lattice. When the lattice parameters vary with time it sustains arbitrary rate of time variations without sacrificing a prescribed degree of stability, provided that the lattice coefficients are magnitude bounded in ...

Emergency medicine: a relatively new specialty.

Cationic Gold Catalyst Poisoning and Reactivation

High gold affinity impurities (halides, bases) in solvents, starting materials, filtration, or drying agents could affect the reactivity of gold catalyst adversely, which may significantly reduce the TON of cationic gold-catalyzed reactions. Use of a suitable acid activator (e.g., HOTf, In(OTf)3) reactivates the gold catalyst and makes the reaction proceed smoothly at low gold catalyst loading.

Evidence for a surface gold hydride on a nanostructured gold catalyst.

Inelastic neutron scattering shows formation of a surface Au-H species, of key importance for the study of catalytic mechanisms. Previous assignment of this feature in the infrared as a purely Ce(3+) transition is shown to be erroneous on reducing the catalyst using hydrogen and deuterium.

Cationic Cyclizations and Rearrangements Promoted by a Heterogeneous Gold Catalyst

A heterogeneous gold catalyst with remarkable activity for promoting the electrophilic reactions of aryl vinyl ketones and aryl dienyl ketones is described. The catalyst is easy to prepare, is robust, and can be recycled. Low loadings are effective for different types of cationic reactions, including Nazarov cyclizations, lactonizations, and [1,2] shifts.