Réactivité du superoxyde de Potassium en phase hétérogéne: Oxydation de naphtalénedios en naphtoquinones hydroxylées

Min, M. de; Croux, Sylvie; Tournaire, Cécile; Hocquaux, M.; Jackquet, Bernard; Oliveros, Esther; Maurette, Marie-Thérèse

doi:10.1016/s0040-4020(01)88511-2

Cited by 20 publications

(6 citation statements)

References 27 publications

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“…The performance of the oxidation depends on the relative position of the hydroxy groups on the naphthalene. Maurette and co-workers 107,108 developed a method to produce 1 involving the oxidation of dihydroxynaphthalenes 37 or 38 with potassium superoxide (KO 2 ) in a heterogeneous aprotic medium (Scheme 5). Other options for the oxidation of naphthalene diols to 1 include tetraethylammonium superoxide for the oxidation of 1,2naphthalene diols (56% yield) 109 and the use of supported metallated phthalocyanine on montmorillonite K10 or zirconium phosphate (ZrPO 4 ) as the oxidation catalysts (80% yield).…”

Section: Preparation Of Lawsone (1) From Naphthalene Derivativesmentioning

confidence: 99%

Lawsone in organic synthesis

et al. 2015

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Section: Preparation Of Lawsone (1) From Naphthalene Derivativesmentioning

confidence: 99%

Lawsone in organic synthesis

et al. 2015

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“…Juglone can be obtained photosensitised from 1 O 2 and 1,5dihydroxynaphthalene (see Scheme 3). 34,35 Consequently this reaction was studied to further characterise the reactor system.…”

Section: Photooxygenationsmentioning

confidence: 99%

OLEDs as prospective light sources for microstructured photoreactors

Ziegenbalg

Kreisel

Weiss

et al. 2014

Photochem Photobiol Sci

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In this work, the use of OLEDs as light sources to initiate photochemical reactions is presented for the first time. A newly developed modular photoreactor system utilising microstructured reactors was equipped with commercially available OLED panels. The technical feature of being a surface emitter, the low thickness and the potentially high luminescent efficiency give reason to expect this kind of light source to be well suited for photochemical reactions. The reactor system was investigated by using photooxygenations as benchmark reactions. In detail, photosensitised [4 + 2]-cycloadditions and [2 + 2]-cycloadditions of (1)O2 were examined as well as Schenck-ene-reactions. It was demonstrated that OLEDs can be successfully used for conducting photochemical reactions. Moreover the equilibrium concentration of (1)O2 can be increased by varying the process conditions. Based on the experimental investigations, a reactor comparison showed that, with respect to productivity and efficiency, the investigated microstructured photoreactor is currently not outperforming conventional batch reactors.

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“…6 2-Hydroxy-1,4-naphthoquinone is mainly obtained from plants 7 and the synthetic preparation is generally complex. 8 (2) by a time-consuming reduction process involving mossy zinc amalgam. 9 We have been successful in carrying out this conversion in a shorter time of 3 h by catalytic hydrogenation 10 using 10% Pd/C in glacial acetic acid at 758C.…”

Section: Introductionmentioning

confidence: 99%