scholarly journals Synthesis of Xanthones, Thioxanthones and Acridones by a Metal-Free Photocatalytic Oxidation Using Visible Light and Molecular Oxygen

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 974
Author(s):  
Alejandro Torregrosa-Chinillach ◽  
Rafael Chinchilla
Keyword(s):  
Visible Light ◽  
Molecular Oxygen ◽  
Blue Light ◽  
Photocatalytic Oxidation ◽  
Photo Oxidation ◽  
Metal Free

9H-Xanthenes, 9H-thioxanthenes and 9,10-dihydroacridines can be easily oxidized to the corresponding xanthones, thioxanthones and acridones, respectively, by a simple photo-oxidation procedure carried out using molecular oxygen as oxidant under the irradiation of visible blue light and in the presence of riboflavin tetraacetate as a metal-free photocatalyst. The obtained yields are high or quantitative.

Visible-Light-Mediated Organoboron-Catalysed Metal-Free Dehydrogenation of N-Heterocycles Using Molecular Oxygen

2021 ◽  
Author(s):  
Lanfeng Wei ◽  
Yu Wei ◽  
Jinli Zhang ◽  
Liang Xu
Keyword(s):  
Visible Light ◽  
Molecular Oxygen ◽  
The Other ◽  
Metal Free ◽  
Other Hand

The surge of photocatalytic transformation not only provides unprecedented synthetical methods, but also triggers the enthusiasm for more sustainable photocatalysts. On the other hand, oxygen is an ideal oxidant in...

Preparation of tungstophosphoric acid/cerium-doped NH2-UiO-66 Z-scheme photocatalyst: A new candidate for green photo-oxidation of dibenzothiophene and quinoline using molecular oxygen as oxidant

2021 ◽  
Author(s):  
Hanieh Fakhri ◽  
Ali Esrafili ◽  
Mahdi Farzadkia ◽  
Rabah Boukherroub ◽  
Varsha Srivastava ◽  
...  
Keyword(s):  
Visible Light ◽  
Molecular Oxygen ◽  
Oxidative Desulfurization ◽  
Tungstophosphoric Acid ◽  
High Ability ◽  
Photo Oxidation ◽  
Photocatalytic System

The goal of this study was to introduce an effective visible-light induced photocatalytic system with high ability of photocatalytic oxidative desulfurization (PODS) and denitrogenation (PODN) using molecular oxygen (O2) as...

Visible light photocatalysis with CBr4: a highly selective aerobic photooxidation of methylarenes to aldehydes

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 14547-14551 ◽  
Author(s):  
Shubhangi Tripathi ◽  
Sachchida N. Singh ◽  
Lal Dhar S. Yadav
Keyword(s):  
Visible Light ◽  
Molecular Oxygen ◽  
Selective Oxidation ◽  
Aromatic Aldehydes ◽  
Visible Light Photocatalysis ◽  
Simple Metal ◽  
Metal Free

An efficient, operationally simple, metal-free strategy for the selective oxidation of methylarenes to aromatic aldehydes through visible light photocatalysis employing CBr4 and molecular oxygen is reported.

Metal-Free Epoxidation of Alkenes with Molecular Oxygen and Benzaldehyde under Visible Light Irradiation

Synlett ◽  
2009 ◽  
Vol 2009 (18) ◽  
pp. 3024-3026 ◽  
Author(s):  
Akichika Itoh ◽  
Norihiro Tada ◽  
Hiroaki Okubo ◽  
Tsuyoshi Miura
Keyword(s):  
Visible Light ◽  
Molecular Oxygen ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Metal Free ◽  
Epoxidation Of Alkenes

scholarly journals Photocatalysis over N-Doped TiO2 Driven by Visible Light for Pb(II) Removal from Aqueous Media

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 945
Author(s):  
Endang Tri Wahyuni ◽  
Titi Rahmaniati ◽  
Aulia Rizky Hafidzah ◽  
Suherman Suherman ◽  
Adhitasari Suratman
Keyword(s):  
Visible Light ◽  
Photocatalytic Oxidation ◽  
Irradiation Time ◽  
Aqueous Media ◽  
Visible Region ◽  
Significant Activity ◽  
Solution Ph ◽  
Doped Tio2 ◽  
Photo Oxidation ◽  
N Doping

The photocatalysis process over N-doped TiO2 under visible light is examined for Pb(II) removal. The doping TiO2 with N element was conducted by simple hydrothermal technique and using urea as the N source. The doped photocatalysts were characterized by DRUVS, XRD, FTIR and SEM-EDX instruments. Photocatalysis of Pb(II) through a batch experiment was performed for evaluation of the doped TiO2 activity under visible light, with applying various fractions of N-doped, photocatalyst mass, irradiation time, and solution pH. The research results attributed that N doping has been successfully performed, which shifted TiO2 absorption into visible region, allowing it to be active under visible irradiation. The photocatalytic removal of Pb(II) proceeded through photo-oxidation to form PbO2. Doping N into TiO2 noticeably enhanced the photo-catalytic oxidation of Pb(II) under visible light irradiation. The highest photocatalytic oxidation of 15 mg/L Pb(II) in 25 mL of the solution could be reached by employing TiO2 doped with 10%w of N content 15 mg, 30 min of time and at pH 8. The doped-photocatalyst that was three times repeatedly used demonstrated significant activity. The most effective process of Pb(II) photo-oxidation under beneficial condition, producing less toxic and handleable PbO2 and good repeatable photocatalyst, suggest a feasible method for Pb(II) remediation on an industrial scale.

scholarly journals Metal-free C–H sulfonamidation of pyrroles by visible light photoredox catalysis

2016 ◽  
Vol 52 (72) ◽  
pp. 10918-10921 ◽  
Author(s):  
Andreas Uwe Meyer ◽  
Anna Lucia Berger ◽  
Burkhard König
Keyword(s):  
Visible Light ◽  
Blue Light ◽  
Photoredox Catalysis ◽  
Metal Free

Blue light and catalytic amounts of an acridinium dye are sufficient for the C–H sulfamidation of pyrroles.

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