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Artykuły w czasopismach na temat „Tandem photochemical reaction”

Autor: Grafiati
Data publikacji: 2 listopada 2024
Data aktualizacji: 31 lipca 2025

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1

Saunthwal, Rakesh K., James Mortimer, Andrew J. Orr-Ewing, and Jonathan Clayden. "Enantioselective one-carbon expansion of aromatic rings by simultaneous formation and chromoselective irradiation of a transient coloured enolate." Chemical Science 13, no. 7 (2022): 2079–85. http://dx.doi.org/10.1039/d1sc06684f.

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Irradiation of a mixture of aromatic amide and chiral base leads to a tandem reaction sequence in which dearomatization forms a chromophore capable of photochemical rearrangement leading to overall asymmetric expansion of the aromatic ring.
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2

Hoffmann, Norbert, Samuel Bertrand, Siniša Marinković, and Jens Pesch. "Efficient radical addition of tertiary amines to alkenes using photochemical electron transfer." Pure and Applied Chemistry 78, no. 12 (2006): 2227–46. http://dx.doi.org/10.1351/pac200678122227.

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An efficient photoinduced radical addition of tertiary amine, mainly cyclic derivatives, to electron-deficient alkenes was developed. The reaction was applied to the asymmetric synthesis of the pyrrolizidine alkaloids laburnine and isoretronecanol. The method was then optimized for the addition of a larger variety of tertiary amines, in particular acyclic ones. Radical tandem addition cyclization reactions with unsaturated tertiary amines have also been investigated. A detailed mechanistic study using isotopic labeling enabled the optimization of a corresponding reaction with N,N-dialkylanilin
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3

Chiminelli, Maurizio, Gabriele Scarica, Andrea Serafino, Luciano Marchiò, Rosanna Viscardi, and Giovanni Maestri. "Visible-Light-Promoted Tandem Skeletal Rearrangement/Dearomatization of Heteroaryl Enallenes." Molecules 29, no. 3 (2024): 595. http://dx.doi.org/10.3390/molecules29030595.

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Access to complex three-dimensional molecular architectures via dearomatization of ubiquitous aryl rings is a powerful synthetic tool, which faces, however, an inherent challenge to overcome energetic costs due to the loss of aromatic stabilization energy. Photochemical methods that allow one to populate high-energy states can thus be an ideal strategy to accomplish otherwise prohibitive reaction pathways. We present an original dearomative rearrangement of heteroaryl acryloylallenamides that leads to complex fused tricycles. The visible-light-promoted method occurs under mild conditions and t
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4

Hou, Yunyan, and Peter Wan. "A pentacene intermediate via formal intramolecular photoredox of a 6,13-pentacenequinone in aqueous solution." Canadian Journal of Chemistry 85, no. 12 (2007): 1023–32. http://dx.doi.org/10.1139/v07-117.

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The formal intramolecular photoredox reaction (or tandem phototautomerizations) of aromatic ketones in aqueous solution discovered in our laboratory has been extended to a number of acenequinones. In particular, we were interested in whether the photoredox reaction could be applied to 2-(hydroxymethyl)-6,13-pentacenequinone (4), which would result in 2-formyl-6,13-dihydroxypentacene (10) and hence offer a photochemical method for synthesizing a pentacene derivative. Whereas a number of acenequinones displayed a range of photoredox reactivity, photolysis of 4 in acidic aqueous solution (pH <
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5

Samiran, Kar, and Lahiri Saswati. "Photochemical intramolecular cyclization routes to heterocycles." Journal of Indian Chemical Society Vol. 76, Nov-Dec 1999 (1999): 607–10. https://doi.org/10.5281/zenodo.5862417.

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Department of Organic Chemistry, Indian Association for the Cultivation of Science, Calcutta-700 032, India <em>Manuscript received 27 August 1999</em> 1-Aryl-3-(2-azidoaryl)prop-2-en-1-ones have been prepared from <em>o</em>-nitro aromatic aldehydes. The 2-aroylindole derivatives are easily prepared from these derivatives in a tandem reaction sequence in moderate yields. Photolytic process is found to be much more facile than the thermal process in this transformation. Naphthofuran derivatives have been prepared by metalcatalyzed intramolecular photocyclizations of 1-aryl-3-(2-methoxy-1-napht
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6

Liang, Yan Ru, Yu Yun Wen, Xiao Yan Hong, Zhen Bin Gong, and Wen Quan Li. "Laboratory Simulation Study of Photo-Degradation Process of Fenvalerate in Aqueous Solution." Applied Mechanics and Materials 312 (February 2013): 886–92. http://dx.doi.org/10.4028/www.scientific.net/amm.312.886.

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A laboratory-made the efficient photochemical degradation experimental device, combined with high performance liquid chromatography-tandem diode array detector device (DAD), fluorescence detector (FLD), mass spectrometer detector (MS), research fenvalerate its photo degradation. The structure of the spectral characteristics is the product, photo degradation reaction kinetics of degradation products, suggesting fenvalerate light chemical degradation process in an aqueous solution. The spectral characteristics of fenvalerate under ultraviolet light can be degraded into smaller organic molecules;
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7

Ren, Jia, Elissia T. Franklin, and Yu Xia. "Uncovering Structural Diversity of Unsaturated Fatty Acyls in Cholesteryl Esters via Photochemical Reaction and Tandem Mass Spectrometry." Journal of The American Society for Mass Spectrometry 28, no. 7 (2017): 1432–41. http://dx.doi.org/10.1007/s13361-017-1639-6.

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8

Li, Hai-Fang, Jing Zhao, Wenbo Cao, Wenpeng Zhang, Yu Xia, and Zheng Ouyang. "Site-Specific Photochemical Reaction for Improved C=C Location Analysis of Unsaturated Lipids by Ultraviolet Photodissociation." Research 2022 (February 12, 2022): 1–12. http://dx.doi.org/10.34133/2022/9783602.

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Unraveling the complexity of the lipidome requires the development of novel approaches to facilitate structural identification and characterization of lipid species with isomer-level discrimination. Ultraviolet photodissociation tandem mass spectrometry (UVPD MS/MS) is a promising tool for structure determination of lipids. The sensitivity of UVPD for lipid analysis however is limited mainly due to weak absorption of UV photons by a C=C. Herein, a C=C site-specific derivatization, the Paternò-Büchi (PB) reaction, was used to incorporate a chromophore to the C=C moiety in fatty acyls, leading t
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9

Ma, Xiaoxiao, Leelyn Chong, Ran Tian, et al. "Identification and quantitation of lipid C=C location isomers: A shotgun lipidomics approach enabled by photochemical reaction." Proceedings of the National Academy of Sciences 113, no. 10 (2016): 2573–78. http://dx.doi.org/10.1073/pnas.1523356113.

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The field of lipidomics has been significantly advanced by mass spectrometric analysis. The distinction and quantitation of the unsaturated lipid isomers, however, remain a long-standing challenge. In this study, we have developed an analytical tool for both identification and quantitation of lipid C=C location isomers from complex mixtures using online Paternò–Büchi reaction coupled with tandem mass spectrometry (MS/MS). The potential of this method has been demonstrated with an implementation into shotgun lipid analysis of animal tissues. Among 96 of the unsaturated fatty acids and glyceroph
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10

Javier, Corpas, Gomez-Mendoza Miguel, Ramírez-Cárdenas Jonathan, et al. "One-Metal/Two-Ligand for Dual Activation Tandem Catalysis: Photoinduced Cu-Catalyzed Anti-hydroboration of Alkynes." J. Am. Chem. Soc. 144, no. 2022 (2022): 13006−13017. https://doi.org/10.5281/zenodo.7684895.

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A dual catalyst system based on ligand exchange of two diphosphine ligands possessing different properties in a copper complex has been devised to merge metal- and photocatalytic activation modes. This strategy has been applied to the formal anti-hydroboration of activated internal alkynes via a tandem sequence in which Cu/Xantphos catalyzes the B<sub>2</sub>pin<sub>2</sub>-<em>syn</em>-hydroboration of the alkyne whereas Cu/BINAP serves as a photocatalyst for visible light-mediated isomerization of the resulting alkenyl boronic ester. Photochemical studies by means of UV&ndash;vis absorption,
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11

Janechek, Nathan J., Rachel F. Marek, Nathan Bryngelson, et al. "Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane." Atmospheric Chemistry and Physics 19, no. 3 (2019): 1649–64. http://dx.doi.org/10.5194/acp-19-1649-2019.

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Abstract. Cyclic volatile methyl siloxanes (cVMS) are high-production chemicals present in many personal care products. They are volatile, hydrophobic, and relatively long-lived due to slow oxidation kinetics. Evidence from chamber and ambient studies indicates that oxidation products may be found in the condensed aerosol phase. In this work, we use an oxidation flow reactor to produce ∼100 µg m−3 of organosilicon aerosol from OH oxidation of decamethylcyclopentasiloxane (D5) with aerosol mass fractions (i.e., yields) of 0.2–0.5. The aerosols were assessed for concentration, size distribution,
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12

Liu, Yidan, Xu Ren, Yali Ji, et al. "The Lattice Mismatch-Driven Photochemical Self-Assembly of Supported Heterostructures for Stable and Enhanced Electrocatalytic Carbon Dioxide Reduction Reaction." Molecules 29, no. 23 (2024): 5560. http://dx.doi.org/10.3390/molecules29235560.

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Metallic heterostructural nanocrystals (HNCs) hold immense potential in electrocatalytic carbon dioxide reduction reaction (CO2RR) owing to their abundant active sites and high intrinsic activity. However, a significant challenge still remains in achieving controlled nucleation and growth sites for HNCs on supports and comprehending the influence of the structure–activity relationship on electrocatalytic CO2RR performance. This work presents a photochemical self-assembly technique without the necessity for reducing agents or facet-specific capping agents. By controlling lattice mismatch and ma
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13

Bertrand, Samuel, Norbert Hoffmann, Jean-Pierre Pete, and Véronique Bulach. "Stereoselective radical-tandem reaction of aniline derivatives with (5R)-5-menthyloxy-2,5-dihydrofuran-2-one initiated by photochemical induced electron transfer." Chemical Communications, no. 22 (1999): 2291–92. http://dx.doi.org/10.1039/a906051k.

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14

Murphy, Robert C., Toshiaki Okuno, Christopher A. Johnson, and Robert M. Barkley. "Determination of Double Bond Positions in Polyunsaturated Fatty Acids Using the Photochemical Paternò-Büchi Reaction with Acetone and Tandem Mass Spectrometry." Analytical Chemistry 89, no. 16 (2017): 8545–53. http://dx.doi.org/10.1021/acs.analchem.7b02375.

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15

Bertrand, Samuel, Norbert Hoffmann, Jean-Pierre Pete, and Veronique Bulach. "ChemInform Abstract: Stereoselective Radical-Tandem Reaction of Aniline Derivatives with (5R)-5-Menthyloxy-2,5-dihydrofuran-2-one Initiated by Photochemical Induced Electron Transfer." ChemInform 31, no. 23 (2010): no. http://dx.doi.org/10.1002/chin.200023142.

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16

Trucksess, Mary W., Carol M. Weaver, Carolyn J. Oles, et al. "Use of Multitoxin Immunoaffinity Columns for Determination of Aflatoxins and Ochratoxin A in Ginseng and Ginger." Journal of AOAC INTERNATIONAL 90, no. 4 (2007): 1042–49. http://dx.doi.org/10.1093/jaoac/90.4.1042.

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Abstract Conditions were optimized for the simultaneous, alkaline, aqueous methanol extraction of aflatoxins (AFL), i.e., B1 (AFB1), B2 (AFB2), G1 (AFG1), and G2 (AFG2), and ochratoxin A (OTA) with subsequent purification, isolation, and determination of the toxins in ginseng and ginger. Powdered roots were extracted with methanol0.5% NaHCO3 solution (7 + 3). After shaking and centrifugation, the supernatant was diluted with 100 mM phosphate buffer containing 1% Tween 20 and filtered through glass microfiber filter paper. The filtrate was then passed through an immunoaffinity column, and the t
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17

King, Alex J., Alexis T. Bell, and Adam Z. Weber. "(Invited) Design Tradeoffs and Model-Based Optimization for Photoelectrochemical Water Splitting and CO2 Reduction." ECS Meeting Abstracts MA2025-01, no. 39 (2025): 2066. https://doi.org/10.1149/ma2025-01392066mtgabs.

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In the design of cells for photelectrochemical water reduction (i.e., hydrogen generation) and CO2 reduction, there are various tradeoffs that must be understood. These stem from kinetic, thermodynamic, and especially transport ohenomena that control the local environment and hence overall overpotentials. Mathematical modeling is ideally suited to explore these tradeoffs endemic to photoelectrochemical systems. In this talk, we will detail our recent modeling work that explores different archietctures for hydrogen generation such as the metal-insulator-semiconductor (MIS) structure. In this ar
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18

Buendia, Julien, Zong Chang, Hendrik Eijsberg, et al. "Preparation of Cyclobutene Acetals and Tricyclic Oxetanes through Photochemical Tandem and Cascade Reactions." Angewandte Chemie 130, no. 22 (2018): 6702–6. http://dx.doi.org/10.1002/ange.201803571.

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Buendia, Julien, Zong Chang, Hendrik Eijsberg, et al. "Preparation of Cyclobutene Acetals and Tricyclic Oxetanes through Photochemical Tandem and Cascade Reactions." Angewandte Chemie International Edition 57, no. 22 (2018): 6592–96. http://dx.doi.org/10.1002/anie.201803571.

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20

Cheng, Jian, Bin Zheng, Sheng Cheng, Guoying Zhang, and Jinming Hu. "Metal-free carbon monoxide-releasing micelles undergo tandem photochemical reactions for cutaneous wound healing." Chemical Science 11, no. 17 (2020): 4499–507. http://dx.doi.org/10.1039/d0sc00135j.

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Metal-free carbon monoxide-releasing polymers (CORPs) are synthesized via a direct polymerization approach, exhibiting not only improved stability but also accelerated wound healing performance as compared to CORM-3.
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21

Bertrand, Samuel, Norbert Hoffmann, Stéphane Humbel, and Jean Pierre Pete. "Diastereoselective Tandem Addition−Cyclization Reactions of Unsaturated Tertiary Amines Initiated by Photochemical Electron Transfer (PET)." Journal of Organic Chemistry 65, no. 25 (2000): 8690–703. http://dx.doi.org/10.1021/jo001166l.

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22

Chanmanee, Wilaiwan, Mohammad Fakrul Islam, Brian H. Dennis, and Frederick M. MacDonnell. "Solar photothermochemical alkane reverse combustion." Proceedings of the National Academy of Sciences 113, no. 10 (2016): 2579–84. http://dx.doi.org/10.1073/pnas.1516945113.

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A one-step, gas-phase photothermocatalytic process for the synthesis of hydrocarbons, including liquid alkanes, aromatics, and oxygenates, with carbon numbers (Cn) up to C13, from CO2 and water is demonstrated in a flow photoreactor operating at elevated temperatures (180–200 °C) and pressures (1–6 bar) using a 5% cobalt on TiO2 catalyst and under UV irradiation. A parametric study of temperature, pressure, and partial pressure ratio revealed that temperatures in excess of 160 °C are needed to obtain the higher Cn products in quantity and that the product distribution shifts toward higher Cn p
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23

Marinković, Siniša, and Norbert Hoffmann. "Diastereoselective Radical Tandem Addition-Cyclization Reactions of Aromatic Tertiary Amines by Semiconductor-Sensitized Photochemical Electron Transfer." European Journal of Organic Chemistry 2004, no. 14 (2004): 3102–7. http://dx.doi.org/10.1002/ejoc.200400102.

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Nakatani, Kazuhiko, Kaoru Adachi, Kazuhito Tanabe, and Isao Saito. "Tandem Cyclizations Involving Carbene as an Intermediate: Photochemical Reactions of Substituted 1,2-Diketones Conjugated with Ene-Yne." Journal of the American Chemical Society 121, no. 36 (1999): 8221–28. http://dx.doi.org/10.1021/ja990763q.

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Bertrand, Samuel, Norbert Hoffmann, Stephane Humbel, and Jean Pierre Pete. "ChemInform Abstract: Diastereoselective Tandem Addition-Cyclization Reactions of Unsaturated Tertiary Amines Initiated by Photochemical Electron Transfer (PET)." ChemInform 32, no. 17 (2001): no. http://dx.doi.org/10.1002/chin.200117044.

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Aoyama, Hiromu. "Photochemical reactions of thiobenzamides bearing an allylic substituent on the nitrogen atom: double-bond migration via tandem 1,4- and 1,6-hydrogen transfer." Journal of the Chemical Society, Perkin Transactions 1, no. 12 (1997): 1851–54. http://dx.doi.org/10.1039/a700247e.

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Pretali, Luca, Angelo Albini, Alice Cantalupi, Federica Maraschi, Stefania Nicolis, and Michela Sturini. "TiO2-Photocatalyzed Water Depollution, a Strong, yet Selective Depollution Method: New Evidence from the Solar Light Induced Degradation of Glucocorticoids in Freshwaters." Applied Sciences 11, no. 6 (2021): 2486. http://dx.doi.org/10.3390/app11062486.

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The photodegradation of the most prescribed glucocorticoids (GCs) was studied under relevant environmental conditions in the presence of suspended TiO2. The considered drugs included cortisone (CORT), hydrocortisone (HCORT), betamethasone (BETA), dexamethasone (DEXA), prednisone (PRED), prednisolone (PREDLO), and triamcinolone (TRIAM). The experiments were carried out at concentrations (50 µg L−1) close to the real ones in freshwater samples (tap and river) under simulated and natural sunlight, and their decomposition took place very efficiently under natural sunlight. The reactions were monit
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28

Flores, J. M., D. F. Zhao, L. Segev, et al. "Evolution of the complex refractive index in the near UV spectral region in ageing secondary organic aerosol." Atmospheric Chemistry and Physics Discussions 14, no. 3 (2014): 4149–87. http://dx.doi.org/10.5194/acpd-14-4149-2014.

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Abstract. The chemical and physical properties of secondary organic aerosol (SOA) formed by the photochemical degradation of biogenic and anthropogenic volatile organic compounds (VOC) are yet poorly constrained. The evolution of the complex refractive index (RI) of SOA, formed from purely biogenic VOC and mixtures of biogenic and anthropogenic VOC was studied over a diurnal cycle in the SAPHIR photochemical outdoor chamber in Jülich, Germany. The correlation of RI with SOA chemical and physical properties such as oxidation level and volatility was examined. The RI was retrieved by a newly dev
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Flores, J. M., D. F. Zhao, L. Segev, et al. "Evolution of the complex refractive index in the UV spectral region in ageing secondary organic aerosol." Atmospheric Chemistry and Physics 14, no. 11 (2014): 5793–806. http://dx.doi.org/10.5194/acp-14-5793-2014.

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Abstract. The chemical and physical properties of secondary organic aerosol (SOA) formed by the photochemical degradation of biogenic and anthropogenic volatile organic compounds (VOC) are as yet still poorly constrained. The evolution of the complex refractive index (RI) of SOA, formed from purely biogenic VOC and mixtures of biogenic and anthropogenic VOC, was studied over a diurnal cycle in the SAPHIR photochemical outdoor chamber in Jülich, Germany. The correlation of RI with SOA chemical and physical properties such as oxidation level and volatility was examined. The RI was retrieved by a
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AOYAMA, H. "ChemInform Abstract: Photochemical Reactions of Thiobenzamides Bearing an Allylic Substituent on the Nitrogen Atom: Double-Bond Migration via Tandem 1,4- and 1,6-Hydrogen Transfer." ChemInform 28, no. 44 (2010): no. http://dx.doi.org/10.1002/chin.199744091.

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yu, xiaodan, Thomas Boddaert, and David J. Aitken. "Functionalized alkylidenecyclobutanes from a cyclopent‐2‐enone substrate via a tandem photochemical transformation and an allylic substitution protocol." Advanced Synthesis & Catalysis, October 4, 2023. http://dx.doi.org/10.1002/adsc.202300798.

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A four‐step metal‐free procedure is described for the transformation of 4‐hydroxy‐2‐methylcyclopent‐2‐enone derivatives into highly functionalized E‐alkylidenecyclobutanes featuring oxygenated tetrasubstituted centers. The key intermediate is a (cyclobutenyl)propane‐1,3‐diol diester, easily accessed via a tandem photochemical reaction, which undergoes an original Brønsted acid‐catalyzed allylic substitution reaction with alcohols to give the title products with ester‐protected primary alcohol side chains.
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Gou, Yanhui, Xiaoqing Wang, Juan Wang, Hongya Li, Yunyi Zhang та Zhengsen Yu. "Photochemical cascade cyclization of quinazolinone-tethered unactivated alkenes with α‐halocarbonyls toward 2,3-fused quinazolinones". Organic & Biomolecular Chemistry, 2025. https://doi.org/10.1039/d5ob00534e.

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The divergent synthesis of 2,3-fused quinazolinones via photocatalytic tandem cyclization has been disclosed. It features green reaction conditions, good functional group compatibility and applicable to gram-scale synthesis. Especially the precursors...
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Chen, Honghao, Yuhao Wang, Feixiang Yao, et al. "Chlorine Radical Mediated Deprotection of Aryl Ethers via Photocatalyzed Ligand‐to‐Metal Charge Transfer." Asian Journal of Organic Chemistry, June 16, 2025. https://doi.org/10.1002/ajoc.202500423.

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AbstractA photochemical FeCl3‐catalyzed the C(sp3)‐H activation of aryl ethers was achieved via hydrogen atom abstraction strategy of chlorine radicals. Followed by the tandem hydrolysis, the aryl ethers were converted into the corresponding phenol products (28 examples). Compared with traditional reductive deprotection methods for aryl ethers, such as Pd/C, Mg/alcohol system and so forth, our strategy features mild reaction conditions, atom economy, and wide functional group compatibility. In addition, several control experiments were conducted to investigate the reasonable mechanism.
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Zhu, Yaqing, Fengchao Yi, Ningning Zhou, et al. "Photochemical tandem reaction of nitrogen containing heterocycles, bicyclo[1.1.1]pentane, and difluoroiodane(iii) reagents." Organic & Biomolecular Chemistry, 2024. http://dx.doi.org/10.1039/d4ob01020e.

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Ivatt, Peter D., Mathew J. Evans, and Alastair C. Lewis. "Suppression of surface ozone by an aerosol-inhibited photochemical ozone regime." Nature Geoscience, July 7, 2022. http://dx.doi.org/10.1038/s41561-022-00972-9.

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AbstractAtmospheric ozone (O3) is a pollutant produced through chemical chain reactions where volatile organic compounds (VOCs), carbon monoxide and methane are oxidized in the presence of oxides of nitrogen (NOx). For decades, the controlling chain termination step has been used to separate regions into either ‘NOx limited’ (peroxyl-radical self-reactions dominate) or ‘VOC limited’ (hydroxyl radical (OH) + nitrogen dioxide (NO2) reaction dominates). The controlling regime would then guide policies for reducing emissions and so O3 concentrations. Using a chemical transport model, we show that
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Shen, Di, Qun Zhao, Huaiyue Zhang, et al. "A hydrophobic photouncaging reaction to profile the lipid droplet interactome in tissues." Proceedings of the National Academy of Sciences 122, no. 16 (2025). https://doi.org/10.1073/pnas.2420861122.

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Most bioorthogonal photouncaging reactions preferentially occur in polar environments to accommodate biological applications in the aqueous cellular milieu. However, they are not precisely designed to chemically adapt to the diverse microenvironments of the cell. Herein, we report a hydrophobic photouncaging reaction with tailored photolytic kinetics toward solvent polarity. Structural modulations of the aminobenzoquinone-based photocage reveal the impact of cyclic ring size, steric substituent, and electronic substituent on the individual uncaging kinetics ( k H2O and k dioxane ) and polarity
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Li, Peifeng, Wanghui Zhao, Kaixuan Wang, Tao Wang, and Biaobiao Zhang. "Photocatalytic Synthesis of Glycine from Methanol and Nitrate." Angewandte Chemie, August 13, 2024. http://dx.doi.org/10.1002/ange.202405370.

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Photocatalytic utilization of methanol and nitrate as carbon and nitrogen sources for the direct synthesis of amino acids could provide a sustainable way for the valorization of green “liquid sunlight” and nitrate waste. In this study, we developed an efficient photochemical method to synthesize glycine directly from methanol and nitrate, which cascades the C‐C coupling to form glycol, nitrate reduction to NH3, and finally C‐N coupling to generate glycine. Interestingly, the involved photocatalytic tandem reactions show a synergistic effect, in which the presence of nitrate is the dominant fac
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Li, Peifeng, Wanghui Zhao, Kaixuan Wang, Tao Wang, and Biaobiao Zhang. "Photocatalytic Synthesis of Glycine from Methanol and Nitrate." Angewandte Chemie International Edition, August 13, 2024. http://dx.doi.org/10.1002/anie.202405370.

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Photocatalytic utilization of methanol and nitrate as carbon and nitrogen sources for the direct synthesis of amino acids could provide a sustainable way for the valorization of green “liquid sunlight” and nitrate waste. In this study, we developed an efficient photochemical method to synthesize glycine directly from methanol and nitrate, which cascades the C‐C coupling to form glycol, nitrate reduction to NH3, and finally C‐N coupling to generate glycine. Interestingly, the involved photocatalytic tandem reactions show a synergistic effect, in which the presence of nitrate is the dominant fac
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Mohamadpour, Farzaneh. "Photochemical synthesis of pyrano[2,3-d]pyrimidine scaffolds using photoexcited organic dye, Na2 eosin Y as direct hydrogen atom transfer (HAT) photocatalyst via visible light-mediated under air atmosphere." BMC Chemistry 17, no. 1 (2023). http://dx.doi.org/10.1186/s13065-023-00912-7.

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AbstractThe Knoevenagel-Michael cyclocondensation of barbituric acid/1,3-dimethylbarbituric acid, malononitrile, and arylaldehyde derivatives was used to construct a multicomponent green tandem method for the metal-free synthesis of pyrano[2,3-d]pyrimidine scaffolds. At room temperature in aqueous ethanol, photo-excited state functions generated from Na2 eosin Y were employed as direct hydrogen atom transfer (HAT) catalysts by visible light mediated in the air atmosphere. This research looks towards expanding the use of a non-metallic organic dye that is both affordable and readily available.
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Zhang, Hanzhi, Jingdan Zhao, Zhenhua Tian, and Hao Liu. "Structure Analysis of Unsaturated Polymyxin E Components Based on High Performance Liquid Chromatography – Quadrupole/ Time of Flight Tandem Mass Spectrometry and Photochemical Reaction." Current Pharmaceutical Analysis 18 (September 1, 2022). http://dx.doi.org/10.2174/1573412918666220901150000.

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Background: Polymyxin E (PME), which is a complex of cationic cyclic lipodecapeptides, is used to treat multidrug-resistant gram-negative bacterial infections. Besides the main components PME1 and PME2, polymyxin containing unsaturated fatty acyl (FA) group with lower contents is hardly to determine the structure without chromatographic preparations and NMR. Introduction: The peptide sequences of PME components has been carried out based on high performance liquid chromatography-quadrupole / time-of-flight mass spectrometry (HPLC-Q/TOF-MS). However, the components with double bond on the FA, s
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Wang, Zhanyong, guipeng feng, xiaoying jiang, hanyue xue, qing xu, and ran xia. "Recent Developments in C‐S, C‐Se Bond Formation via Three‐Component Reactions of Alkynes." European Journal of Organic Chemistry, August 28, 2024. http://dx.doi.org/10.1002/ejoc.202400844.

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Alkynes are valuable building blocks in organic synthesis. They can undergo three‐component difunctionalization to create sulfur or selenium‐containing compounds. Three‐component reactions of alkynes are atom economic, practical and regioselective. This review will disscuss decade developments, including C‐S and C‐Se bond formation via thiolation, sulfonylation and selenylation. Recent developments can be mainly categorized into three types. (1) Radical C‐S/S‐Se bond formation is a hot topic. Reactions initiated by S/Se radicals or other radicals exhibit two types of selectivities. Photochemic
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Gao, Minmin, Tianxi Zhang, Serene Wen Ling Ng, et al. "Polymeric Layered Films for TiO2‐Au/CuS Tandem Photothermal Catalytic H2 Production in Harsh Seawater and Waste Plastic Media." Advanced Energy Materials, January 10, 2025. https://doi.org/10.1002/aenm.202404198.

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AbstractConventional suspension photocatalysts face stability and efficiency challenges in harsh, unconditioned environments characterized by high alkalinity, salinity, and organic species in seawater and wastewater. Moreover, suspension‐based photothermal‐assisted catalysis presents further challenges, particularly concerning formation of heterojunctions between photocatalysts and photothermal materials that disrupt charge‐transfer pathways and are exacerbated by photothermal heating‐induced carrier recombination. Here, a photocatalytic system is proposed in which three key photoprocesses: ph
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Pretali, Luca, Angelo Albini, Alice Cantalupi, Federica Maraschi, Stefania Nicolis, and Michela Sturini. "TiO2-Photocatalyzed Water Depollution, a Strong, yet Selective Depollution Method: New Evidence from the Solar Light Induced Degradation of Glucocorticoids in Freshwaters." March 11, 2021. https://doi.org/10.3390/app11062486.

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The photodegradation of the most prescribed glucocorticoids (GCs) was studied under relevant environmental conditions in the presence of suspended TiO2. The considered drugs included cortisone (CORT), hydrocortisone (HCORT), betamethasone (BETA), dexamethasone (DEXA), prednisone (PRED), prednisolone (PREDLO), and triamcinolone (TRIAM). The experiments were carried out at concentrations (50 µg L−1) close to the real ones in freshwater samples (tap and river) under simulated and natural sunlight, and their decomposition took place very efficiently under natural sunlight. The reactions were monit
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