Oxidative dealkylation of a hindered phenol catalyzed by copper (II) bis benzimidazole diamide complex

Bis(2-aminoethyl-1H-benzimidazole)chlorocopper(II) nitrate

“…1) has a trigonal-bipyramidal coordination geometry defined by two chelating 2-aminoethylbenzimidazole ligands and a Cl atom. The Cu-N bond distances (Table 1) are similar to those reported in related Cu imidazole/benzimidazole complexes (Colacio et al, 2000;Gupta et al, 2006). The Cu-N bond distances (Table 1) are similar to those reported in related Cu imidazole/benzimidazole complexes (Colacio et al, 2000;Gupta et al, 2006).…”

Oxidation of electron deficient olefins using a copper(II) complex based on a bis-benzimidazole diamide ligand

“…We believe that a similar mechanism may be operative in our case also. Earlier we have found that similar, bis-benzimidazole copper(II) complexes, also catalyze reactions by the hydrogen abstraction mechanism [11,13].…”

“…of commercially available TBHP. Earlier, we have initiated a study of copper(II) complexes utilizing bis benzimidazole diamide ligands, as oxidants towards a variety of substrates [11][12][13].…”

Mononuclear copper(ll) aspirinate or salicylate complexes with methylimidazoles as biomimetic catalysts for oxidative dealkylation of a hindered phenol, oxidation of catechol and their superoxide scavenging activities

“…It has been found that the oxidative dealkylation of TTBP by transition metal complexes proceed through the formation of TTBP radical followed by formation of metal-superoxo intermediate species which is used to oxygenate the TTBP radical [18][19][20]. For copper(II) complexes (1-4) under investigations this is presented by Eqs.…”

“…The oxygenation reaction of TTBP through the initial formation of the 2,4,6-tri-tert-butylphenoxyl radical was followed spectrophotometrically. An oxygen saturated methanol or CH 2 Cl 2 solution of copper(II) complex (0.3 mL of 1 × 10 −3 M) was mixed with 2 mL (0.05 M) of TTBP dissolved in methanol or CH 2 Cl 2 and the formation of phenoxyl radical was followed at 400 nm, since TTB phenoxyl radical showed bands in visible region at about 634 nm, 400 nm and 382 nm [18,21].…”