Photocatalyst- and transition-metal-free α-allylation of N-aryl tetrahydroisoquinolines mediated by visible light

2020 ◽  
Vol 22 (3) ◽  
pp. 646-650 ◽  
Author(s):  
Zhuohua Li ◽  
Pengju Ma ◽  
Yongzhu Tan ◽  
Yufei Liu ◽  
Min Gao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Metal Free

A convenient and efficient α-allylation of N-aryl tetrahydroisoquinolines has been achieved. This transformation can be realized under only visible light irradiation without the aid of transition metals or photocatalysts.

Photocatalytic transition-metal-free direct 3-alkylation of 2-aryl-2H-indazoles in dimethyl carbonate

2021 ◽  
Author(s):  
Chunhua Ma ◽  
Zhiwen Feng ◽  
Jing Li ◽  
Dandan Zhang ◽  
Wei Li ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Dimethyl Carbonate ◽  
Light Irradiation ◽  
Alkylation Reaction ◽  
Metal Free ◽  
Mild Conditions

A general transition-metal-free photocatalytic decarboxylative 3-alkylation reaction of 2-aryl-2H-indazoles was developed under visible-light irradiation under mild conditions.

Organophotoredox assisted cyanation of bromoarenes via silyl-radical-mediated bromine abstraction

2020 ◽  
Vol 56 (30) ◽  
pp. 4240-4243 ◽  
Author(s):  
Maniklal Shee ◽  
Sk. Sheriff Shah ◽  
N. D. Pradeep Singh
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Aromatic Nitriles ◽  
Metal Free ◽  
Silyl Radical ◽  
Aryl Bromides

The transition metal-free conversion of aryl bromides into aromatic nitriles using an organophotocatalyst under visible light irradiation.

Linking Melem with Conjugated Schiff-Base Bond to Boost Photocatalytic Efficiency of Carbon Nitride for Overall Water Splitting

Nanoscale ◽  
2021 ◽  
Author(s):  
Hu Liu ◽  
Mengqi Shen ◽  
Peng Zhou ◽  
Zhi Guo ◽  
Xinyang Liu ◽  
...  
Keyword(s):  
Schiff Base ◽  
Visible Light ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Carbon Nitride ◽  
Light Irradiation ◽  
Graphitic Carbon Nitride ◽  
Photocatalytic Efficiency ◽  
Metal Free ◽  
Overall Water Splitting

Developing an efficient single component photocatalyst for overall water splitting under visible-light irradiation is extremely challenging. Herein, we report a metal-free graphitic carbon nitride (g-CxN4)-based nanosheet photocatalyst (x = 3.2,...

Dehydrogenative 6π Heterocyclization under Visible Light Irradiation and Mechanistic Insights

2021 ◽  
Author(s):  
Zhao Zhang ◽  
Haohua Chen ◽  
Niklas Keller ◽  
Qin Xiong ◽  
Lei Liu ◽  
...  
Keyword(s):  
Transition Metals ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Reaction Proceeds ◽  
Visible Light Driven

A visible-light-driven oxidative 6π heterocycilization for the synthesis of structurally diverse π-conjugated polycyclic 1-aminoisoquinolines has been developed. The reaction proceeds under visible-light or sunshine, obviates photocatalyst and transition-metals, and features...

New Avenues in Radical Trifluoromethylselenylation with ­Trifluoromethyl Tolueneselenosulfonate

Synlett ◽  
2018 ◽  
Vol 30 (07) ◽  
pp. 777-782 ◽  
Author(s):  
Clément Ghiazza ◽  
Cyrille Monnereau ◽  
Lhoussain Khrouz ◽  
Maurice Médebielle ◽  
Thierry Billard ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Transition Metal ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Room Temperature ◽  
Diazonium Salts ◽  
Metal Free ◽  
Luminescence Measurement ◽  
Stable Reagent ◽  
Shelf Stable

We demonstrated that the shelf-stable reagent trifluoromethyl tolueneselenosulfonate can be involved in radical trifluoromethylselenylation. Upon visible-light irradiation, the homolysis of the reagent could take place at room temperature. This finding is explored for unprecedented C(sp2)–SeCF3 and C(sp3)–SeCF3 processes under transition-metal-free conditions. Mechanistic investigations, including cyclic voltammetry, luminescence measurement, and EPR studies, allowed the proposal of plausible mechanisms.1 Introduction.2 Reactivity of Reagent I with Diazonium Salts3 Reactivity of Reagent I with Alkenes and Alkynes4 Conclusion

Noble-metal-free Ni3N/g-C3N4 photocatalysts with enhanced hydrogen production under visible light irradiation

2018 ◽  
Vol 47 (35) ◽  
pp. 12188-12196 ◽  
Author(s):  
Lu Chen ◽  
Huijuan Huang ◽  
Yuanhui Zheng ◽  
Wenhao Sun ◽  
Yi Zhao ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Noble Metal ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
Metal Free

Noble-metal-free Ni3N/g-C3N4 heterojunctions that show high photocatalytic hydrogen evolution activity comparable to platinized g-C3N4 were successfully synthesized.

scholarly journals TiO2 Photocatalyzed C–H Bond Transformation for C–C Coupling Reactions

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 355 ◽  
Author(s):  
Yi Wang ◽  
Anan Liu ◽  
Dongge Ma ◽  
Shuhong Li ◽  
Chichong Lu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Transition Metal Catalysis ◽  
Light Irradiation ◽  
Coupling Reactions ◽  
Metal Catalysis ◽  
Bond Functionalization ◽  
Tio2 Photocatalysis ◽  
Mild Conditions

Fulfilling the direct inert C–H bond functionalization of raw materials that are earth-abundant and commercially available for the synthesis of diverse targeted organic compounds is very desirable and its implementation would mean a great reduction of the synthetic steps required for substrate prefunctionalization such as halogenation, borylation, and metalation. Successful C–H bond functionalization mainly resorts to homogeneous transition-metal catalysis, albeit sometimes suffering from poor catalyst reusability, nontrivial separation, and severe biotoxicity. TiO2 photocatalysis displays multifaceted advantages, such as strong oxidizing ability, high chemical stability and photostability, excellent reusability, and low biotoxicity. The chemical reactions started and delivered by TiO2 photocatalysts are well known to be widely used in photocatalytic water-splitting, organic pollutant degradation, and dye-sensitized solar cells. Recently, TiO2 photocatalysis has been demonstrated to possess the unanticipated ability to trigger the transformation of inert C–H bonds for C–C, C–N, C–O, and C–X bond formation under ultraviolet light, sunlight, and even visible-light irradiation at room temperature. A few important organic products, traditionally synthesized in harsh reaction conditions and with specially functionalized group substrates, are continuously reported to be realized by TiO2 photocatalysis with simple starting materials under very mild conditions. This prominent advantage—the capability of utilizing cheap and readily available compounds for highly selective synthesis without prefunctionalized reactants such as organic halides, boronates, silanes, etc.—is attributed to the overwhelmingly powerful photo-induced hole reactivity of TiO2 photocatalysis, which does not require an elevated reaction temperature as in conventional transition-metal catalysis. Such a reaction mechanism, under typically mild conditions, is apparently different from traditional transition-metal catalysis and beyond our insights into the driving forces that transform the C–H bond for C–C bond coupling reactions. This review gives a summary of the recent progress of TiO2 photocatalytic C–H bond activation for C–C coupling reactions and discusses some model examples, especially under visible-light irradiation.

Metal-Free Iodoperfluoroalkylation: Photocatalysis versus Frustrated Lewis Pair Catalysis

Synthesis ◽  
2020 ◽  
Vol 53 (01) ◽  
pp. 123-134
Author(s):  
Constantin Czekelius ◽  
Lucas Helmecke ◽  
Michael Spittler ◽  
Bernd M. Schmidt
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Reaction Pathways ◽  
Frustrated Lewis Pairs ◽  
Metal Free ◽  
Comprehensive Account ◽  
Frustrated Lewis Pair ◽  
Catalytic Metal ◽  
Lewis Pairs

A comparison of two catalytic, metal-free iodoperfluoro­alkylation protocols is presented. Frustrated Lewis pairs [ t Bu3P/B(C6F5)3] or phosphines/phosphites under visible light irradiation efficiently mediate the functionalization of non-activated alkenes and alkynes. A comprehensive account of the corresponding substrate scopes as well as insights into the mechanistic details of both reaction pathways are provided.

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