Search results for "Autocatalytic photooxidation"

showing 2 items of 2 documents

Selective photooxidation of ortho-substituted benzyl alcohols and the catalytic role of ortho-methoxybenzaldehyde

2016

It has been recently reported by Palmisano et al. (2015) [1] that the oxidation of 2-methoxybenzyl alcohol (2-MBA) to 2-methoxybenzaldehyde (2-MBAD) proceeds in water under near-UV light with an unexpected catalytic effect of 2-MBAD. In order to investigate the catalytic role of aldehyde in photolytic oxidation of ortho-substituted benzyl alcohols (OSBAs), reactivity runs were carried out with 2-methylbenzyl alcohol (2-MeBA), 2-nitrobenzyl alcohol (2-NBA), 2-hydroxybenzyl alcohol (2-HBA) and 2-chlorobenzyl alcohol (2-CIBA) in the absence and in the presence of their corresponding aldehyde. None of those alcohols showed a measurable oxidation rate even in the presence of their aldehydes but …

General Chemical EngineeringGeneral Physics and AstronomyAlcohol2-MethoxybenzaldehydeHomogeneous photocatalysi010402 general chemistry01 natural sciencesAldehydeCatalysisFerulic acidPhysics and Astronomy (all)chemistry.chemical_compoundBenzyl alcoholOrganic chemistryChemical Engineering (all)Reactivity (chemistry)chemistry.chemical_classificationSettore ING-IND/24 - Principi Di Ingegneria Chimica010405 organic chemistryChemistryChemistry (all)General Chemistry0104 chemical sciencesAutocatalytic photooxidationAlcohol oxidationPhotocatalysis2-Methoxybenzaldehyde; Autocatalytic photooxidation; Benzyl alcohols; Homogeneous photocatalysis; Chemistry (all); Chemical Engineering (all); Physics and Astronomy (all)Selectivity
researchProduct

Unexpectedly ambivalent O-2 role in the autocatalytic photooxidation of 2-methoxybenzyl alcohol in water

2015

An unusual autocatalytic photooxidation of 2-methoxybenzyl alcohol has been observed under UV irradiation in aqueous medium. The homogeneous oxidation is catalyzed by the corresponding aldehyde that is also the main oxidation product. The trend of alcohol disappearance rate matches the typical shape of an autocatalytic process, where a crucial and ambivalent role is played by the presence of molecular oxygen. Low oxygen concentrations give rise to a zero-order reaction since the beginning of irradiation, while higher amounts of oxygen reduce the alcohol oxidation rate until the aldehyde reaches a concentration high enough to speed up the alcohol's conversion. Experiments performed by varyin…

chemistry.chemical_classificationSettore ING-IND/24 - Principi Di Ingegneria ChimicaAqueous solutionAutocatalytic photooxidation 2-Methoxybenzyl alcohol 2-Methoxybenzaldehyd O2 quenchingHomogeneous photocatalysisProcess Chemistry and Technologychemistry.chemical_elementAlcoholSettore CHIM/06 - Chimica OrganicaPhotochemistryOxygenAldehydeCatalysisCatalysisAutocatalysischemistry.chemical_compoundchemistrySettore CHIM/03 - Chimica Generale E InorganicaAlcohol oxidationPhysical and Theoretical ChemistryAbsorption (chemistry)
researchProduct