Thermally Activated Delayed Fluorescence Sensitizers As Organic and Green Alternatives in Energy-Transfer Photocatalysis DOI
Ryoga Hojo,

Alexander M. Polgar,

Zachary M. Hudson

et al.

ACS Sustainable Chemistry & Engineering, Journal Year: 2022, Volume and Issue: 10(30), P. 9665 - 9678

Published: July 21, 2022

Photocatalysis has captured the imagination of synthetic chemists and is poised to become a staple fine chemical industry. Over past decade, subfield energy-transfer (EnT) catalysis expanded dramatically, harnessing excited states photosensitizer unlock variety redox-neutral, radical-based reactivities in mild selective fashion. However, many developments this discipline rely on precious rare earth metals such as iridium. This perspective will highlight rise thermally activated delayed fluorescence (TADF) materials metal-free alternatives EnT photocatalysis for organic transformations. Emphasis be placed recent progress cycloadditions, E/Z isomerization olefins, other radical-initiated processes; all mediated by mechanism Dexter energy transfer. The tunable excited-state energetics dynamics TADF allow them effectively compete with iridium-based sensitizers, indicating their promise green organocatalysis.

Language: Английский

Visible light-induced Z-scheme V2O5/g-C3N4 heterojunction catalyzed cascade reaction of unactivated alkenes DOI
Qingwen Gui, Fan Teng, Peng Yu

et al.

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2022, Volume and Issue: 44, P. 111 - 116

Published: Dec. 2, 2022

Language: Английский

Citations

81

Visible‐Light‐Promoted Switchable Selective Oxidations of Styrene Over Covalent Triazine Frameworks in Water DOI Creative Commons

Cyrine Ayed,

Jie Yin, Katharina Landfester

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(15)

Published: Jan. 28, 2023

Using photocatalytic oxidation to convert basic chemicals into high value compounds in environmentally benign reaction media is a current focus catalytic research. The challenge lies gaining controllability over product formation selectivity. We design covalent triazine frameworks as heterogeneous, metal-free, and recyclable photocatalysts for visible-light-driven switchable selective of styrene pure water. Selectivity was achieved by activation or deactivation the specific photogenerated oxygen species. same photocatalyst, H2 O2 , benzaldehyde obtained with 99 % conversion selectivity single product. highly challenging sensitive epoxidation carried out creating peroxymonocarbonate an initial agent presence bicarbonate, which led oxide up 76 near quantitative conversion. This study demonstrates preliminary yet interesting example simple control reactions organic

Language: Английский

Citations

45

Tailored carbon materials (TCM) for enhancing photocatalytic degradation of polyaromatic hydrocarbons DOI Creative Commons
Avtar Singh, Jaspreet S. Dhau, Rajeev Kumar

et al.

Progress in Materials Science, Journal Year: 2024, Volume and Issue: 144, P. 101289 - 101289

Published: March 28, 2024

This comprehensive review explores the potential of tailored carbon materials (TCM) for efficient photocatalytic degradation polyaromatic hydrocarbons (PAHs), which are persistent and toxic organic pollutants posing significant environmental challenges. The unique structure properties TCM including graphene nanotubes to activated dots, have projected them as next-generation technological innovation. A careful critical discussion state-of-the-art research sheds light on their effectiveness in catalyzing breakdown PAHs, projects suitable management environment. Beyond this viewpoint, article expands scope 1) biomedical healthcare, 2) energy storage conversion, 3) advanced electronics. challenges, opportunities, future perspectives related role applications, inspiring further research, innovation photo-induced techniques also carefully discussed article. focused serves a valuable resource researchers industrialists interested harnessing capabilities carbon-based sustainable PAHs other pollutants. It addresses pressing need effective remediation pollution control strategies.

Language: Английский

Citations

32

Divergent Synthesis of Fluoroalkyl Ketones through Controlling the Reactivity of Organoboronate Complexes DOI
Gang Zhou,

Zhuanzhuan Guo,

Shanshan Liu

et al.

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(6), P. 4026 - 4035

Published: Feb. 1, 2024

Herein, we report a divergent synthesis of fluoroalkyl ketones through visible-light-induced reactions between readily available organoboronic esters and acylsilanes. Selective control the reactivity in situ generated organoboronate complexes is key to achieving transformations. Under basic conditions, undergo deboronative fluoride elimination, resulting formation enol silyl ethers as intermediates that react with various electrophiles generate defluorinated products. Moreover, combination peroxide, 1,2-shift group favored over elimination ketal intermediates, leading This transition-metal-free reaction operationally simple, aryl, alkenyl, alkyl boronic are all suitable substrates. The synthetic potential has been demonstrated by gram-scale facile bioactive molecules including zifrosilone its analogs.

Language: Английский

Citations

31

Switchable divergent di- or tricarboxylation of allylic alcohols with CO2 DOI
Bo Yu, Yi Liu,

Han-Zhi Xiao

et al.

Chem, Journal Year: 2024, Volume and Issue: 10(3), P. 938 - 951

Published: Jan. 10, 2024

Language: Английский

Citations

27

Photoinduced Regiodivergent and Enantioselective Cross-Coupling of Glycine Derivatives with Hydrocarbon Feedstocks DOI
Fuxing Yang,

Longxiao Chi,

Ziqi Ye

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 2, 2025

Regiodivergent asymmetric synthesis represents a transformative strategy for the efficient generation of structurally diverse chiral products from single set starting materials, significantly enriching their enantiomeric composition. However, design radical-mediated regiodivergent and enantioselective reactions that can accommodate wide range functional groups substrates has posed significant challenges. The obstacles primarily lie in switching regioselectivity achieving high enantiodiscrimination, especially when dealing with high-energy intermediates. To address these issues, we have developed new catalytic system integrates photoinduced hydrogen atom transfer (HAT) copper catalysis, involving fine-tuning ligands, additives, other reaction parameters. facilitates cross-couplings between N-aryl glycine ester/amide derivatives abundant hydrocarbon feedstocks through strong C(sp3)–H bond activation. This approach allows controlled stereoselective formation C(sp3)–C(sp3) C(sp3)–N bonds, yielding rich variety C- or N-alkylated esters amides commendable yields (up to 92% yield), exclusive regioselectivities (typically >20:1 rr), enantioselectivities 96% ee). Our methodology not only provides promising avenue incorporation alkyl functionalities onto specific sites biologically molecules but also offers practical while simultaneously induction within photochemical reactions.

Language: Английский

Citations

7

Nickel‐Catalyzed Switchable Site‐Selective Alkene Hydroalkylation by Temperature Regulation** DOI
Jia‐Wang Wang, Deguang Liu, Zhe Chang

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(31)

Published: May 25, 2022

Regiodivergent alkene functionalization that produces either regioisomer starting from the same raw materials is desirable. Herein, we report a nickel-catalyzed switchable site-selective hydroalkylation. The selection of reaction temperatures leads to protocols provide regiodivergent hydroalkylated products single substrate. This protocol allows convenient synthesis α- and β-branched protected amines, both which are important fields pharmaceutical chemistry biochemistry. In addition, enantioenriched alkylamines can be accessed in catalytic asymmetric variant. Preliminary mechanistic studies indicate formation more stable nickelacycle provides driving force migration. thermodynamic kinetic properties different reduction elimination intermediates responsible for site-selectivity.

Language: Английский

Citations

67

Sensitizer-controlled photochemical reactivityviaupconversion of red light DOI Creative Commons
Felix Glaser, Oliver S. Wenger

Chemical Science, Journal Year: 2022, Volume and Issue: 14(1), P. 149 - 161

Published: Dec. 1, 2022

By combining the energy input from two red photons, chemical reactions that would normally require blue or ultraviolet irradiation become accessible. Key advantages of this biphotonic excitation strategy are light usually penetrates deeper into complex reaction mixtures and causes less photo-damage than direct illumination in ultraviolet. Here, we demonstrate primary light-absorber a dual photocatalytic system comprised transition metal-based photosensitizer an organic co-catalyst can completely alter outcome. Photochemical reductions achieved with copper(i) presence sacrificial electron donor, whereas oxidative substrate activation occurs osmium(ii) photosensitizer. Based on time-resolved laser spectroscopy, changeover photochemical reactivity is due to different underlying mechanisms. Following triplet transfer 9,10-dicyanoanthracene (DCA) subsequent triplet-triplet annihilation upconversion, fluorescent singlet excited state DCA triggers activation, which initiates

Language: Английский

Citations

42

Enantioselective Chemodivergent Three-Component Radical Tandem Reactions through Asymmetric Photoredox Catalysis DOI

Chaorui Ma,

Jingyu Shen,

Chaofan Qu

et al.

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(36), P. 20141 - 20148

Published: Aug. 28, 2023

Chemodivergent synthesis has been achieved in asymmetric photocatalysis. Under a dual catalyst system consisting of chiral phosphoric acid and DPZ as photosensitizer, different inorganic bases enabled the formation two sets valuable products from three-component radical tandem transformations 2-bromo-1-arylenthan-1-ones, styrenes, quinoxalin-2(1H)-ones. The key to success was distinct pKa environment, which radicals that formed on quinoxalin-2(1H)-one rings after addition processes underwent either single-electron oxidation or reduction. In addition, this work represents first use quinoxalin-2(1H)-ones photoredox catalysis.

Language: Английский

Citations

31

Ni-catalyzed ligand-controlled divergent and selective synthesis DOI
Yang Ke, Wei Li, Wenfeng Liu

et al.

Science China Chemistry, Journal Year: 2023, Volume and Issue: 66(11), P. 2951 - 2976

Published: May 5, 2023

Language: Английский

Citations

30