Ghosh, Ivy; Chakraborty, Biswarup; Bera, Abhijit; Paul, Satadal; Paine, Tapan Kanti published the artcile< Selective oxygenation of C-H and C=C bonds with H2O2 by high-spin cobalt(II)-carboxylate complexes>, Application of C19H16O, the main research area is cobalt aminemethyltrispyridine phenylacetato benzoato benzilato mandelato complex catalyst preparation; Reaction kinetics cobalt aminemethyltrispyridine phenylacetato benzoato benzilato mandelato complex; crystal structure cobalt aminemethyltrispyridine phenylacetato benzoato benzilato mandelato complex; electrochem DFT cobalt aminemethyltrispyridine phenylacetato benzoato benzilato mandelato complex.
Four cobalt(II)-carboxylate complexes [(6-Me3-TPA)CoII(benzoate)](BPh4) (1), [(6-Me3-TPA)CoII(benzilate)](ClO4) (2), [(6-Me3-TPA)CoII(mandelate)](BPh4) (3), and [(6-Me3-TPA)CoII(MPA)](BPh4) (4) (HMPA = 2-methoxy-2-phenylacetic acid) of the 6-Me3-TPA (tris((6-methylpyridin-2-yl)methyl)amine) ligand were isolated to investigate their ability in H2O2-dependent selective oxygenation of C-H and CC bonds. All six-coordinate complexes contain a high-spin cobalt(II) center. While the cobalt(II) complexes are inert toward dioxygen, each of these complexes reacts readily with hydrogen peroxide to form a diamagnetic cobalt(III) species, which decays with time leading to the oxidation of the Me groups on the pyridine rings of the supporting ligand. Intramol. ligand oxidation by the cobalt-based oxidant is partially inhibited in the presence of external substrates, and the substrates are converted to their corresponding oxidized products. Kinetic studies and labeling experiments indicate the involvement of a metal-based oxidant in affecting the chemo- and stereo-selective catalytic oxygenation of aliphatic C-H bonds and epoxidation of alkenes. An electrophilic cobalt-oxygen species that exhibits a kinetic isotope effect (KIE) value of 5.3 in toluene oxidation by 1 is proposed as the active oxidant. Among the complexes, the cobalt(II)-benzoate (1) and cobalt(II)-MPA (4) complexes display better catalytic activity compared to their α-hydroxy analogs (2 and 3). Catalytic studies with the cobalt(II)-acetonitrile complex [(6-Me3-TPA)CoII(CH3CN)2](ClO4)2 (5) in the presence and absence of externally added benzoate support the role of the carboxylate co-ligand in oxidation reactions. The proposed catalytic reaction involves a carboxylate-bridged dicobalt complex in the activation of H2O2 followed by the oxidation of substrates by a metal-based oxidant.
Dalton Transactions published new progress about Alkenes Role: RCT (Reactant), RACT (Reactant or Reagent). 76-84-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C19H16O, Application of C19H16O.
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts