Visible Light-Induced Iodine-Catalyzed Transformation of Terminal Alkynes to Primary AmidesviaCC Bond Cleavage under Aqueous Conditions

2016 ◽  
Vol 358 (3) ◽  
pp. 500-505 ◽  
Author(s):  
Shashikant U. Dighe ◽  
Sanjay Batra
Keyword(s):  
Visible Light ◽  
Bond Cleavage ◽  
Terminal Alkynes ◽  
Aqueous Conditions

Copper(i)-catalysed oxidative C–N coupling of 2-aminopyridine with terminal alkynes featuring a CC bond cleavage promoted by visible light

2016 ◽  
Vol 52 (79) ◽  
pp. 11756-11759 ◽  
Author(s):  
Ayyakkannu Ragupathi ◽  
Arunachalam Sagadevan ◽  
Chun-Cheng Lin ◽  
Jih-Ru Hwu ◽  
Kuo Chu Hwang
Keyword(s):  
Visible Light ◽  
Triple Bond ◽  
Room Temperature ◽  
Bond Cleavage ◽  
Terminal Alkynes

An efficient and eco-friendly approach to aerobic oxidative C–N coupling of 2-aminopyridine with terminal alkynes for preparation of biologically important pyridyl-amides via CC triple bond cleavage at room temperature.

Copper-catalysed Csp3–Csp cross-couplings between cyclobutanone oxime esters and terminal alkynes induced by visible light

2020 ◽  
Vol 56 (34) ◽  
pp. 4676-4679 ◽  
Author(s):  
Binlin Zhao ◽  
Yixiao Wu ◽  
Yu Yuan ◽  
Zhuangzhi Shi
Keyword(s):  
Visible Light ◽  
Bond Cleavage ◽  
Terminal Alkynes

A novel transformation for the construction of Csp3–Csp bonds was achieved via a photo-induced copper-catalysed C–C bond cleavage.

Biomimetic controlled radical photopolymerization in a two-dimensional organized environment under visible light

2021 ◽  
Vol 57 (81) ◽  
pp. 10612-10615
Author(s):  
Sergey A. Dergunov
Keyword(s):  
Visible Light ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Active Role ◽  
Atom Transfer ◽  
Two Dimensional ◽  
Aqueous Conditions

The vesicle bilayer functions as a confined organized environment for the rapid photoinduced atom transfer radical polymerization (photoATRP) of methacrylates under benign aqueous conditions, where accommodation of the monomers plays an active role.

Visible-Light-Promoted CC Bond Cleavage: Photocatalytic Generation of Iminium Ions and Amino Radicals

2012 ◽  
Vol 51 (32) ◽  
pp. 8050-8053 ◽  
Author(s):  
Shunyou Cai ◽  
Xinyang Zhao ◽  
Xinbo Wang ◽  
Qisong Liu ◽  
Zigang Li ◽  
...  
Keyword(s):  
Visible Light ◽  
Bond Cleavage ◽  
Iminium Ions

ChemInform Abstract: Oxygen Switch in Visible-Light Photoredox Catalysis: Radical Additions and Cyclizations and Unexpected C-C-Bond Cleavage Reactions.

ChemInform ◽  
2013 ◽  
Vol 44 (29) ◽  
pp. no-no
Author(s):  
Shaoqun Zhu ◽  
Arindam Das ◽  
Lan Bui ◽  
Hanjun Zhou ◽  
Dennis P. Curran ◽  
...  
Keyword(s):  
Visible Light ◽  
Bond Cleavage ◽  
Photoredox Catalysis ◽  
Cleavage Reactions

scholarly journals Light-Driven Depolymerization of Native Lignin Enabled by Proton- Coupled Electron Transfer

2019 ◽  
Author(s):  
Suong Nguyen ◽  
Phillip Murray ◽  
Robert Knowles
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Bond Cleavage ◽  
Direct Conversion ◽  
Alkoxy Radical ◽  
Radical Intermediate ◽  
Polymer Backbone ◽  
Good Efficiency ◽  
Chemical Reagents ◽  
Proton Coupled Electron Transfer

<div><p>Here we report a catalytic, light-driven method for the redox-neutral depolymerization of native lignin biomass at ambient temperature. This transformation proceeds via a proton-coupled electron-transfer (PCET) activation of an alcohol O–H bond to generate a key alkoxy radical intermediate, which then drives the <i>β</i>-scission of a vicinal C–C bond. Notably, this depolymerization is driven solely by visible light irradiation, requiring no stoichiometric chemical reagents and producing no stoichiometric waste. This method exhibits good efficiency and excellent selectivity for the activation and fragmentation of <i>β</i>-O-4 linkages in the polymer backbone, even in the presence of numerous other PCET-active functional groups. DFT analysis suggests that the key C–C bond cleavage reactions produce non-equilibrium product distributions, driven by excited-state redox events. These results provide further evidence that visible-light photocatalysis can serve as a viable method for the direct conversion of lignin biomass into valuable arene feedstocks.</p></div>

Visible-Light-Promoted Three-Component Cycloaddition Reaction: Synthesis of 4-Functionalized 1,5-Disubstituted 1,2,3-Triazoles

2021 ◽  
Author(s):  
atul kumar ◽  
Navaneet Kumar ◽  
Deepak Bhadoria
Keyword(s):  
Visible Light ◽  
Cycloaddition Reaction ◽  
Reaction Synthesis ◽  
Terminal Alkynes ◽  
Sodium Salts ◽  
Three Component Reaction

A first visible-light promoted and photocatalyst-free three-component reaction protocol has been developed to synthesize 4-functionalized 1,5-disubstituted 1,2,3-triazoles from terminal alkynes, arylazides, and arylsulfinic acid sodium salts or arylsulfonyl hydrazides in...

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