An arene-stabilized η5-pentamethylcyclopentadienyl antimony dication acts as a source of Sb+ or Sb3+ cations

The dicationic compound [(η5-Cp*)Sb(tol)][B(C6F5)4]2 (1) (tol = toluene), which exhibits strong Lewis acidity, reacts with Lewis bases to provide Sb+ or Sb3+ cations.

Probing the active sites for methane activation on Ga/ZSM-5 zeolites with solid-state NMR spectroscopy

Solid-state NMR reveals that the active Ga species are located on Brønsted acid sites in Ga/ZSM-5 zeolite channels and show strong Lewis acidity for methane activation.

DFT Studies Provide Mechanistic Insight into Nickel-Catalyzed Cross-Coupling Involving Organoaluminum-Mediated C–O Bond Cleavage

Density functional theory (DFT) calculations were performed to examine the reaction pathway of Ni-catalyzed cross-coupling with organoaluminum through C–O bond cleavage. The results indicate that the strong Lewis acidity of organoaluminums significantly facilitates the transmetalation step, but not the oxidative addition or reductive elimination step.

Mechanistic insight to acidity effects of Ga/HZSM-5 on its activity for propane aromatization

Mechanistic insight to the synergistic effect between Brønsted acidity and strong Lewis acidity of Ga/HZSM-5 on propane aromatization activity.