Association of Keggin-type anions with cationic meso-substituted porphyrins: synthesis, characterization and oxidative catalytic studies

Hydroxylation of Benzene to Phenol by Molecular Oxygen over an Organic–Inorganic Hybrid Catalyst: Schiff Base Manganese Complex Attached to Molybdovanadophosphoric Heteropolyacid

“…Various organic units such as aliphatic amines [16], metalloporphyrins [17], and bipyrimidinylplatinum [18] were doped into Keggin heteropolyacids to modify their catalytic performances in oxidation reactions. Recently, we observed the promotion effects of cyclodextrin [19] and pyridine [20,21] in the hydroxylation of benzene to phenol by molecular oxygen and/or hydrogen peroxide when anchoring them to Keggin heteropolyacids.…”

“…On the other hand, Schiff base metal complexes are well-known catalysts for many oxidation reactions [22], thus, the combination of Schiff base metal compounds with heteropolyacids should lead to a kind of novel organicinorganic hybrid materials, the catalytic property of which may be reinforced by the two moieties [17]. Nevertheless, they are largely overlooked in catalysis context [23].…”

Homogeneous and Heterogeneous Free-Based Porphyrins Incorporated to Silica Gel as Fluorescent Materials and Visible Light Catalysts Mimic Monooxygenases

“…Secondly, supramolecular mimetic approaches with modulation of heterogeneous environment to restrict substrate orientation or access have been used. Many interesting examples of activity of porphyrins and metalloporphyrins in such systems have been reported, for example: amphiphilized metalloporphyrins in the micellar media for epoxidation of limonene (Mancini et al, 2001;Cantonetti et al, 2004), complex imbedded in a self-assembled lipid or surfactant bilayer (Groves & Neumann, 1989;Feiters et al, 2000), porphyrins appended with β-cyclodextrines (Breslow, 1997;Woggon, 2010), polyethylene glycol-modified hemin (Takahashi et al, 1986), surfactant-heme complex (Kamiya et al, 1997), association of polyoxometalates with porphyrins (Santos et al, 2005), association of monoclonal anti-porphyrin antibodies (so-cold hemoabzymes) with metalloporphyrin cofactor (Nimri & Keinan, 1999;Ricoux et al, 2007). The most promising solution to improve the stability of porphyrin catalysts is to immobilize or encapsulate in a solid, usually inorganic, matrix.…”

Oxidation of o-chloro and o-hydroxy benzyl alcohols catalyzed by copper (II) tetraphenylporphyrin nanoparticles synthesized by mixed solvent method

“…For the first time, the iron porphyrin complexes have been reported by Han et al as a good catalyst for oxidation of benzyl alcohols to the carbonyl compounds 29 . In general, the electron withdrawing groups in the phenyl ring of the benzyl alcohols have given lesser yield in oxidation processes [37][38][39][40] . In this study, we reported the synthesis and characterization of CuTPP NPs, and then the catalytic activity of produced NPs for oxidation of two different benzyl alcohols was investigated.…”