The oxidation of cyclic alcohols from an aqueous solution by manganese porphyrins embedded in a polydimethylsiloxane membrane

Investigation of a new oxidative catalytic system involving Jacobsen's catalyst in the absence of organic solvents

“…Since both the complexes in homogeneous solution and immobilized on the membrane have similar UV-vis spectral profiles, it can be assumed that: (i) encapsulation of the Jacobsen's catalyst in the hybrid polymeric membrane does not lead to any structural disturbance, and (ii) the catalyst does not undergo any electronic interactions between the central metal ion and the surrounding polymer. Similar results have been described by other researchers for encapsulated catalysts based on Mn(salen) [41,42].…”

Biomimetic Homogeneous Oxidation Catalyzed by Metalloporphyrins with Green Oxidants

“…Accordingly, variety of transition metal based catalysts (mainly cobalt, vanadium, ruthenium and palladium) has been intensively investigated for aerobic oxidation of alcohols so far. [77][78][79][80] Although metalloporphyrins have been used to catalyze the oxidation of alcohols with PhIO, t-BuOOH, KHSO 5 and m-CPBA (m-chloroperbenzoic acid) as oxidants, [81][82][83][84] few studies on metalloporphyrins-catalyzed oxidation of alcohols by molecular oxygen were reported. For examples, Woo and co-authors ever reported the aerobic homogeneous oxidation of benzyl alcohol with oxotitanium porphyrin (TTP)Ti=O (TTP=meso-tetra-p-tolylporphyrin), which gave benzaldehyde in modest yields (48%) after 94 hours in refluxing chlorobenzene.…”

Aspects of Immobilisation of Catalysts on Polymeric Supports

“…being found between the PDMS sorption and the reactivity of different oxidised alcohols. [212,213] In the epoxidation of deactivated substrates, like hydroxyalkenes, ketone formation can be suppressed by electron-donating axial ligands, like imidazole. With this additive co-incorporated in PDMS, the ketone formation was completely absent.…”