scholarly journals Radical difluoromethylthiolation of aromatics enabled by visible light

2018 ◽  
Vol 9 (26) ◽  
pp. 5781-5786 ◽  
Author(s):  
Jianbin Li ◽  
Dianhu Zhu ◽  
Leiyang Lv ◽  
Chao-Jun Li
Keyword(s):  
Visible Light ◽  
Broad Spectrum ◽  
Noble Metals ◽  
Metal Catalyst ◽  
Stoichiometric Amount ◽  
Catalyst Free ◽  
Shelf Stable

A metal-catalyst-free and redox-neutral innate difluoromethylthiolation method enabled by visible light is described. This protocol employs a shelf-stable and readily available electrophilic difluoromethylthiolating reagent, PhSO2SCF2H, and converts a broad spectrum of arenes and heteroarenes to difluoromethylthioethers without noble metals and stoichiometric amount of additives.

scholarly journals Straightforward synthesis of quinazolin-4(3H)-ones via visible light-induced condensation cyclization

RSC Advances ◽  
2022 ◽  
Vol 12 (3) ◽  
pp. 1494-1498
Author(s):  
Wuji Sun ◽  
Xue Ma ◽  
Yuqi Pang ◽  
Lifeng Zhao ◽  
Qidi Zhong ◽  
...  
Keyword(s):  
Energy Source ◽  
Visible Light ◽  
Functional Group ◽  
Clean Energy ◽  
Metal Catalyst ◽  
Catalyst Free ◽  
Clean Energy Source

Visible light was used as a readily available and renewable clean energy source for the green and metal catalyst free synthesis of quinazolin-4(3H)-ones. High and excellent yields of the desired products were obtained with good functional group tolerance.

Visible-light activated metal catalyst-free vicinal diazidation of olefins with sulfonium iodate(i) species

2019 ◽  
Vol 55 (19) ◽  
pp. 2833-2836 ◽  
Author(s):  
Thurpu Raghavender Reddy ◽  
Dodla Sivanageswara Rao ◽  
Sudhir Kashyap
Keyword(s):  
Visible Light ◽  
Late Stage ◽  
Metal Catalyst ◽  
Radical Process ◽  
Biologically Relevant ◽  
Catalyst Free

An unprecedented visible-light inspired selective radical azidation of unactivated and diverse substituted vinylarenes with sulfonium iodate reagent has been realized. The intrinsic radical process triggered by light tolerated several synthetically useful functionalities enabling two new carbon-hetero bonds which display distinctive late-stage applications to biologically relevant scaffolds.

Visible Light and Hydroxynaphthylbenzimidazoline Promoted Transition-Metal-Catalyst-Free Desulfonylation of N-Sulfonylamides and N-Sulfonylamines

2018 ◽  
Vol 83 (18) ◽  
pp. 10813-10825 ◽  
Author(s):  
Eietsu Hasegawa ◽  
Yuto Nagakura ◽  
Norihiro Izumiya ◽  
Keisuke Matsumoto ◽  
Tsukasa Tanaka ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Catalyst Free

Metal catalyst-free photo-induced alkyl C–O bond borylation

2020 ◽  
Vol 56 (70) ◽  
pp. 10219-10222 ◽  
Author(s):  
Guobin Ma ◽  
Changzhou Chen ◽  
Sangita Talukdar ◽  
Xinluo Zhao ◽  
Chuanhu Lei ◽  
...  
Keyword(s):  
Visible Light ◽  
Metal Catalyst ◽  
Catalyst Free ◽  
Tertiary Alkyl

Tertiary alkyl boronates were prepared via the C–O bond borylation of the corresponding oxalates under catalyst-free/(DMF)2–B2cat2 initiated visible light-induced conditions.

Visible‐Light Induced C( sp 3 )−H Functionalization for the Formation of C−N Bonds under Metal Catalyst‐Free Conditions

2020 ◽  
Vol 362 (14) ◽  
pp. 2770-2777 ◽  
Author(s):  
Jin‐Yang Chen ◽  
Wenfeng Wu ◽  
Qiang Li ◽  
Wen‐Ting Wei
Keyword(s):  
Visible Light ◽  
Metal Catalyst ◽  
Catalyst Free

Catalyst-Free Photodriven Reduction of α-Haloketones with Hantzsch Ester

Synthesis ◽  
2018 ◽  
Vol 51 (02) ◽  
pp. 508-515 ◽  
Author(s):  
Yong-Qing Yang ◽  
Zheng Lu
Keyword(s):  
Organic Solvent ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Broad Spectrum ◽  
Light Irradiation ◽  
Aromatic Ketones ◽  
Common Organic Solvent ◽  
Catalyst Free ◽  
Aliphatic Ketones

Catalyst-free dehalogenation of α-haloketones under visible light irradiation is studied. The reactions were carried out in common organic solvent. The outcomes of dechlorination are excellent in yields up to 92%, and it is also applicable to bromides, which give even higher yields. The reaction is tolerable to a broad spectrum of substrates, especially to aromatic ketones, including various aryl and hetaryl groups. There are two examples of aliphatic ketones presented in the paper, although their reactivities are not as high as that of the aromatic ketones.

scholarly journals Synthetic strategies for aryl/heterocyclic selenides and tellurides under transition-metal-catalyst free conditions

RSC Advances ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 6682-6698
Author(s):  
Debasish Kundu
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Ball Milling ◽  
Microwave Heating ◽  
Metal Catalyst ◽  
Visible Light Photocatalysis ◽  
Transition Metal Catalyst ◽  
Catalyst Free

Synthesis of aryl and heteroaryl selenides and tellurides are summerized under transition free sustainable conditions by using greener reagents and techniques such as ball milling, microwave heating, ultrasound, visible light photocatalysis etc.

Semiconductor Photocatalysts for Solar-to-Hydrogen Energy Conversion: Recent Advances of CdS

2020 ◽  
Vol 16 ◽  
Author(s):  
Yuxue Wei ◽  
Honglin Qin ◽  
Jinxin Deng ◽  
Xiaomeng Cheng ◽  
Mengdie Cai ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Noble Metals ◽  
Light Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
Theoretical Design ◽  
Recent Developments

Introduction: Solar-driven photocatalytic hydrogen production from water splitting is one of the most promising solutions to satisfy the increasing demands of a rapidly developing society. CdS has emerged as a representative semiconductor photocatalyst due to its suitable band gap and band position. However, the poor stability and rapid charge recombination of CdS restrict its application for hydrogen production. The strategy of using a cocatalyst is typically recognized as an effective approach for improving the activity, stability, and selectivity of photocatalysts. In this review, recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation are summarized. In particular, the factors affecting the photocatalytic performance and new cocatalyst design, as well as the general classification of cocatalysts, are discussed, which includes a single cocatalyst containing noble-metal cocatalysts, non-noble metals, metal-complex cocatalysts, metal-free cocatalysts, and multi-cocatalysts. Finally, future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are described. Background: Photocatalytic hydrogen evolution from water splitting using photocatalyst semiconductors is one of the most promising solutions to satisfy the increasing demands of a rapidly developing society. CdS has emerged as a representative semiconductor photocatalyst due to its suitable band gap and band position. However, the poor stability and rapid charge recombination of CdS restrict its application for hydrogen production. The strategy of using a cocatalyst is typically recognized as an effective approach for improving the activity, stability, and selectivity of photocatalysts. Methods: This review summarizes the recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation. Results: Recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation are summarized. The factors affecting the photocatalytic performance and new cocatalyst design, as well as the general classification of cocatalysts, are discussed, which includes a single cocatalyst containing noble-metal cocatalysts, non-noble metals, metal-complex cocatalysts, metal-free cocatalysts, and multi-cocatalysts. Finally, future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are described. Conclusion: The state-of-the-art CdS for producing hydrogen from photocatalytic water splitting under visible light is discussed. The future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are also described.

Visible-light-initiated Catalyst-free Oxidative Cleavage of Triaryl-Substituted Alkenes C=C Bonds under Ambient Conditions

2021 ◽  
Author(s):  
Wenjing Li ◽  
Shun Li ◽  
Lihua Luo ◽  
Yichen Ge ◽  
Jiaqi Xu ◽  
...  
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Ambient Air ◽  
Oxidative Cleavage ◽  
Ambient Conditions ◽  
Blue Led ◽  
Catalyst Free

The catalyst-free oxidative cleavage of (Z)-triaryl-substituted alkenes bearing pyridyl motif with ambient air under irradiation of blue LED at room temperature has been developed. The reaction was facile and scalable,...

Catalyst-Free [2,3]-Sigmatropic Rearrangement Reactions of Photochemically Generated Ammonium Ylides

Synthesis ◽  
2019 ◽  
Vol 51 (23) ◽  
pp. 4348-4358 ◽  
Author(s):  
Fang Li ◽  
Feifei He ◽  
Rene M. Koenigs
Keyword(s):  
Visible Light ◽  
Sigmatropic Rearrangement ◽  
Tertiary Amines ◽  
Amino Esters ◽  
Catalyst Free ◽  
Rearrangement Reaction ◽  
Rearrangement Reactions ◽  
Free Ammonium

The rearrangement reaction of ammonium ylides furnishes valuable α,α-disubstituted amino esters. In this work, we describe the visible-light photolysis reaction of aryldiazoacetates in the presence of tertiary amines that react via a free ammonium ylide in a sigmatropic rearrangement reaction to provide amino esters in moderate to very good yields (33 examples, up to 97% yield).

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