Effect of substituents and encapsulation on the catalytic activity of copper(II) complexes of two tridentate Schiff base ligands based on thiophene: benzyl alcohol and phenol oxidation reactions

Versatile Activity of a Copper(II) Complex Bearing a N4‐Tetradentate Schiff Base Ligand with Reduced Oxygen Species

“…To accelerate the catalyzed reaction rate, the phenol oxidation was performed at 50 °C, and, effectively, turnover frequencies (TOF = mol p-QI/ mol catalyst h) increased from 4 to 29 h À 1 , keeping pH = 7, 100times excess of reagents over catalyst, and [complex] = 2.6 μM. Higher TOFs with increasing temperature had already been observed for phenol oxidation catalyzed by Cu(II) complexes of salen-type Schiff-base ligands at T > 60 °C, [64][65][66] and tetraazamacrocycle ligands in basic medium and 80 °C. [67] Aimed at determining if mono-or dicopper species are required for peroxidase activity of [Cu(py 2 pn)] 2 + , the initial rate for the formation of the p-QI (r i P ) was measured from the growth of absorbance at 498 nm for different complex concentrations, maintaining constant [H 2 O 2 ] 0 = [phenol] 0 = 0.27 mM, at 25 °C and 50 °C (Table S4).…”

Catalytic Effects of the New Schiff Base Metal Complexes on the Conversion of Benzyl Alcohol to Benzaldehyde and Benzoic Acid

“…Data collection for X-ray crystallography was completed using a Bruker APEX2 CCD diffractometer and data reduction was performed using Bruker SAINT [20]. SHELXS97 was used to solve and SHELXL2014/6 to re ne the structure [21,22].…”

Applications of Cu(0) encapsulated nanocatalysts as superior catalytic systems in Cu-catalyzed organic transformations

“…3) into the supercages of zeolite NaY via the exible ligand method. 62 The neat and encapsulated complexes were used as catalysts in the oxidation reaction of phenol and benzyl alcohol. Remarkably, the encapsulated complexes were both more stable and reactive catalysts in comparison with the desired free complexes.…”