Cu(II) and Ni(II) complexes based on monofunctional and dendrimeric pyrrole-imine ligands: Applications in catalytic liquid phase hydroxylation of phenol

The preparation of Fe/wood-based activated carbon catalyst for phenol hydroxylation from Fe2+ and Fe3+ precursors

“…There were many similar reports about the same phenomenon. 1,2,8 Mugo et al 38 suggested that the predominance of CAT was expected for metal-mediated hydroxylation occurring via a pathway involving initial weak coordination of both phenol and H 2 O 2 to the active site. The anchoring of the two reactants in close proximity to each other led predominantly to a cis arrangement, which in turn resulted in ortho-substitution of the phenol.…”

Mechanistic Insights into Phenol Oxidation by a Copper(II) Complex of a Pyridine‐ and Amide‐Containing Copolymer in an Aqueous Medium

“…Phenol peroxidation by Cu II ‐ P1 in the presence of 20.0 m M H 2 O 2 exhibits a significant rate acceleration; k cat / k o is 1.4 × 10 5 times higher with respect to PhOH autoxidation without the catalyst ( k o = 3.3 × 10 –8 s –1 ) under the same conditions. For comparison, the rate constants are 0.038 s –1 for a Cu II –polymer complex with salen metal‐binding sites ( 2 in Scheme ) in 30 % H 2 O 2 at 80 °C;24 (1.83–3.80) × 10 –3 s –1 for Cu II complexes of some pyrrole–imine ligands ( 3 in Scheme )25 at different pH values with 1:1 PhOH/30 % H 2 O 2 ; 0.18 mL min –1 g –1 (converted to 2.81 × 10 –4 M –1 s –1 ) for a recycling continuous flow reactor of pillared clay containing iron;26 1.23 s –1 for Cu II (picolinato) 2 ( 4 in Scheme ) encapsulated in zeolite Y under 280 W microwave irradiation in the presence of 30 % H 2 O 2 ;27 k cat = 0.213 s –1 , K′ = 1.31 m M , and k cat / K′ = 163 s –1 M –1 for Cu II –β‐amyloid at >50 m M H 2 O 2 ;21 and k cat = 548 s –1 , K m = 2.19 m M , and k cat / K′ = 2.5 × 10 5 s –1 M –1 for horseradish peroxidase C 28…”

Metallodendrimer‐sensitised Cytochrome P450 3A4 Electrochemical Biosensor for TB Drugs

“…Ultra-pure water purified by a Milli-QTM system (Millipore, Massachusetts, USA) was used in all aqueous solutions and throughout the experiments. The CuPPI metallodendrimer used as electrocatalytic platform was synthesised using a modified method to similar to Mugo et al [14]. A 3,5-di-tertbutylsalicyldiminato group was reacted with a commercial sample of G1-DAB-(NH 2 ) 4 using a salicylaldimine to dendrimer ratio of 4 : 1.…”