Construction and stabilization of highly active Cu+ sites in layered double hydroxides for the cascade radical addition/cyclization reactions

Cooperation between the Cu+ and Cu2+ species in CuCoAl layered double hydroxide and the substrate promoting effect afford a really simple protocol for the efficient synthesis of quinazolines

“…934.30 eV, which are assigned to Cu + and Cu 2+ , respectively. 32,[33][34][35] The ratio of Cu + /Cu 2+ could be estimated according to the two spin-orbit doublets, and a value of 0.57 was obtained. The value is significantly higher that of CuMgAl-LDH (0.12), 32 implying that the redox reaction in CuCoAl-LDH was significantly more evident.…”

“…32,[33][34][35] The ratio of Cu + /Cu 2+ could be estimated according to the two spin-orbit doublets, and a value of 0.57 was obtained. The value is significantly higher that of CuMgAl-LDH (0.12), 32 implying that the redox reaction in CuCoAl-LDH was significantly more evident. In addition, the XPS spectra of Co 2p 3/2 for CuCoAl-LDH can also be fitted by two peaks, and binding energies of ca.…”

Synthesis, properties, and application of the new nanocatalyst of double layer hydroxides in the one-pot multicomponent synthesis of 2-amino-3-cyanopyridine derivatives

“…In recent years, two-dimensional nanomaterials have been widely studied and used as attractive candidates for the construction of heterogeneous solid catalysts, electrodes, adsorbents, metal-sulfur batteries, etc 1 – 3 . Double-layered hydroxides known for more than a decade, are abundant in nature and easily extracted, and represent a large class of anion- and cation-exchangeable layered structures with the general formula [M 2+ (1-x) Mx 3+ (OH) 2 is](An - ) x/n.zH 2 O].…”