scholarly journals Metal-Free Photocatalytic Reductive Dehalogenation Using Visible-Light: A Time-Resolved Mechanistic Study

2017 ◽  
Vol 2017 (15) ◽  
pp. 2164-2169 ◽  
Author(s):  
Rebeca Martinez-Haya ◽  
Miguel A. Miranda ◽  
M. Luisa Marin
Keyword(s):  
Visible Light ◽  
Reductive Dehalogenation ◽  
Mechanistic Study ◽  
Time Resolved ◽  
Metal Free

scholarly journals A comprehensive mechanistic study on the visible-light photocatalytic reductive dehalogenation of haloaromatics mediated by Ru(bpy)3Cl2

2017 ◽  
Vol 7 (20) ◽  
pp. 4852-4858 ◽  
Author(s):  
Mireia Marin ◽  
Miguel A. Miranda ◽  
M. Luisa Marin
Keyword(s):  
Visible Light ◽  
Kinetic Data ◽  
Emission Spectroscopy ◽  
Photocatalytic Reduction ◽  
Reductive Dehalogenation ◽  
Mechanistic Study ◽  
Time Resolved ◽  
Fast Kinetic ◽  
Visible Light Photocatalytic

Fast kinetic data from time-resolved emission spectroscopy shine light on the mechanism involved in the Ru(bpy)32+-photocatalytic reduction of halonitrobenzenes.

scholarly journals [FeFe] Hydrogenase based Prototype Photosensitizer-Catalyst Dyad for Hydrogen Generation under Visible Light

2021 ◽  
Author(s):  
Philipp Buday ◽  
Chizuru Kasahara ◽  
Elisabeth Hofmeister ◽  
Daniel Kowalczyk ◽  
Michael K. Farh ◽  
...  
Keyword(s):  
Visible Light ◽  
Precious Metal ◽  
Hydrogen Generation ◽  
Theoretical Calculations ◽  
Electrochemical Techniques ◽  
Time Resolved ◽  
Metal Free ◽  
Pi Conjugated ◽  
Visible Light Driven ◽  
Light Absorbers

Inspired by the active center of the natural [FeFe] hydrogenases, we designed a compact and precious metal-free photosensitizer-catalyst dyad (PS-CAT) for photocatalytic hydrogen evolution under visible light irradiation. PS-CAT represents a prototype dyad comprising pi-conjugated oligothiophenes as light absorbers. PS-CAT and its interaction with the sacrificial donor 1,3-dimethyl-2-phenylbenzimidazoline were studied by steady-state and time-resolved spectroscopy coupled with electrochemical techniques and visible light-driven photocatalytic investigations. Operando EPR spectroscopy revealed the formation of an active [Fe(I)Fe(0)] species – in accordance with theoretical calculations – presumably driving photocatalysis effectively (TON ≈ 210).

scholarly journals Correction: A comprehensive mechanistic study on the visible-light photocatalytic reductive dehalogenation of haloaromatics mediated by Ru(bpy)3Cl2

2019 ◽  
Vol 9 (6) ◽  
pp. 1543-1543
Author(s):  
Mireia Marin ◽  
Miguel A. Miranda ◽  
M. Luisa Marin
Keyword(s):  
Visible Light ◽  
Reductive Dehalogenation ◽  
Mechanistic Study ◽  
Visible Light Photocatalytic

Correction for ‘A comprehensive mechanistic study on the visible-light photocatalytic reductive dehalogenation of haloaromatics mediated by Ru(bpy)3Cl2’ by Mireia Marin et al., Catal. Sci. Technol., 2017, 7, 4852–4858.

Visible-Light Photoredox-catalyzed Decarboxylative α-tertiary butylation of C(sp3)−H Bond of N-aryl tetrahydroisoquinolines with Pivalic acid under Transition-metal-free Conditions

Synlett ◽  
2021 ◽  
Author(s):  
Li Sun ◽  
Yicheng Zhang ◽  
jie liu ◽  
Pinhua Li
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Functional Groups ◽  
Pivalic Acid ◽  
Mechanistic Study ◽  
Radical Process ◽  
Metal Free

A transition-metal-free visible-light photoredox-catalyzed decarboxylative alkylation of benzylic C-(sp3)−H bonds of N-aryl tetrahydroisoquinolines is reported. The developed methodology tolerates various functional groups and proceeds smoothly without the requirement of stoichiometric oxidants. A preliminary mechanistic study indicated that a radical process is involved in the reaction.

scholarly journals [FeFe] Hydrogenase based Prototype Photosensitizer-Catalyst Dyad for Hydrogen Generation under Visible Light

2021 ◽  
Author(s):  
Philipp Buday ◽  
Chizuru Kasahara ◽  
Elisabeth Hofmeister ◽  
Daniel Kowalczyk ◽  
Michael K. Farh ◽  
...  
Keyword(s):  
Visible Light ◽  
Precious Metal ◽  
Hydrogen Generation ◽  
Theoretical Calculations ◽  
Electrochemical Techniques ◽  
Time Resolved ◽  
Metal Free ◽  
Pi Conjugated ◽  
Visible Light Driven ◽  
Light Absorbers

Inspired by the active center of the natural [FeFe] hydrogenases, we designed a compact and precious metal-free photosensitizer-catalyst dyad (PS-CAT) for photocatalytic hydrogen evolution under visible light irradiation. PS-CAT represents a prototype dyad comprising pi-conjugated oligothiophenes as light absorbers. PS-CAT and its interaction with the sacrificial donor 1,3-dimethyl-2-phenylbenzimidazoline were studied by steady-state and time-resolved spectroscopy coupled with electrochemical techniques and visible light-driven photocatalytic investigations. Operando EPR spectroscopy revealed the formation of an active [Fe(I)Fe(0)] species – in accordance with theoretical calculations – presumably driving photocatalysis effectively (TON ≈ 210).

scholarly journals Activating [FeFe] hydrogenase mimic for hydrogen evolution under visible light

2021 ◽  
Author(s):  
Philipp Buday ◽  
Chizuru Kasahara ◽  
Elisabeth Hofmeister ◽  
Daniel Kowalczyk ◽  
Michael K. Farh ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Precious Metal ◽  
Theoretical Calculations ◽  
Electrochemical Techniques ◽  
Time Resolved ◽  
Metal Free ◽  
Pi Conjugated ◽  
Visible Light Driven ◽  
Light Absorbers

Inspired by the active center of the natural [FeFe] hydrogenases, we designed a compact and precious metal-free photosensitizer-catalyst dyad (PS-CAT) for photocatalytic hydrogen evolution under visible light irradiation. PS-CAT represents a prototype dyad comprising pi-conjugated oligothiophenes as light absorbers. PS-CAT and its interaction with the sacrificial donor 1,3-dimethyl-2-phenylbenzimidazoline were studied by steady-state and time-resolved spectroscopy coupled with electrochemical techniques and visible light-driven photocatalytic investigations. Operando EPR spectroscopy revealed the formation of an active [Fe(I)Fe(0)] species – in accordance with theoretical calculations – presumably driving photocatalysis effectively (TON ≈ 210).

Regioselective C3-H Trifluoromethylation of 2H-Indazole Under Transition-Metal-Free Photoredox Catalysis

2019 ◽  
Author(s):  
Arumugavel Murugan ◽  
Venkata Nagarjuna Babu ◽  
Nagaraj Sabarinathan ◽  
Sharada Duddu. S
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Practical Approach ◽  
Hypervalent Iodine ◽  
Radical Mechanism ◽  
Photoredox Catalysis ◽  
Metal Free

Here we report a visible-light-promoted metal-free regioselective C3-H trifluoromehtylation reaction that proceeds via radical mechanism and which supported by control experiments. The combination of photoredox catalysis and hypervalent iodine reagent provides a practical approach for the present trifluoromethylation reaction and synthesis of a library of trifluoromethylated indazoles.

Metal‐Free and Heterogeneous Photocatalytic Reduction of 4‐Nitroaniline by a Poly(Ethylene Glycol)‐Supported Eosin Dye under Visible‐Light Exposure

ChemCatChem ◽  
2019 ◽  
Vol 11 (14) ◽  
pp. 3307-3317
Author(s):  
Andreea L. Chibac ◽  
Violeta Melinte ◽  
Vlasta Brezová ◽  
Estelle Renard ◽  
Arnaud Brosseau ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Visible Light ◽  
Light Exposure ◽  
Photocatalytic Reduction ◽  
Poly Ethylene Glycol ◽  
Metal Free ◽  
Poly Ethylene

Highly chemoselective deoxygenation of N-heterocyclic N-oxides under transition metal-free conditions

2021 ◽  
Vol 19 (16) ◽  
pp. 3735-3742
Author(s):  
Se Hyun Kim ◽  
Ju Hyeon An ◽  
Jun Hee Lee
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Eosin Y ◽  
Metal Free ◽  
Simple Protocol

Here, we provide an operationally simple protocol for the highly chemoselective deoxygenation of various functionalized N-heterocyclic N-oxides under visible light-mediated photoredox conditions with Na2-eosin Y as an organophotocatalyst.

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