{"title":"A Comprehensive Review of Magnetic Nanocatalysts for C-S, C-Se Bond Formation.","authors":"Radwan Ali, Jianlin Han, Mosstafa Kazemi, Ramin Javahershenas","doi":"10.1002/open.202500041","DOIUrl":"https://doi.org/10.1002/open.202500041","url":null,"abstract":"<p><p>This review manuscript examines magnetic nanocatalysts and their pivotal role in forming carbon-sulfur (C-S) and carbon-selenium (C-Se) bonds. The study delves into the latest advancements in the synthesis, characterization, and application of magnetic nanocatalysts, highlighting their unique advantages, including enhanced catalytic activity, superior selectivity, and easy recovery through magnetic separation, which align with the principles of green chemistry. Through a critical analysis of recent research findings, this review also explores the mechanistic pathways facilitated by these nanocatalysts, offering insights into their operational efficiency and potential for recyclability. The manuscript aims not only to catalog the current achievements in this burgeoning field but also to identify challenges and propose future directions for developing more efficient, sustainable, and versatile catalytic systems for C-S and C-Se bond formation. By encompassing a broad spectrum of magnetic nanocatalysts, ranging from bare magnets to functionalized and composite materials, this review is a comprehensive resource for researchers engaged in organic synthesis, catalysis, and sustainable chemistry.</p>","PeriodicalId":9831,"journal":{"name":"ChemistryOpen","volume":" ","pages":"e202500041"},"PeriodicalIF":2.5,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143718113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ChemistryOpenPub Date : 2025-03-26DOI: 10.1002/open.202500001
Jun Sung Kang, Jin Yi Jung, Chan Jae Cho, Seoungwoo Kang, Yeonjoon Kim, Jae Hyun Kim
{"title":"One-Pot Gram-Scale Synthesis of Cynandione A and Detailed Mechanistic Insights into its Regioselectivity.","authors":"Jun Sung Kang, Jin Yi Jung, Chan Jae Cho, Seoungwoo Kang, Yeonjoon Kim, Jae Hyun Kim","doi":"10.1002/open.202500001","DOIUrl":"https://doi.org/10.1002/open.202500001","url":null,"abstract":"<p><p>Cynandione A, a natural biaryl product with a bis-acetophenone structure isolated from Cynanchi wilfordii Radix, has garnered considerable attention because of its diverse biological activities, including anti-inflammatory, neuroprotective, antioxidant, and adipogenic effects. However, the limited natural and commercial availability of cynandione A impedes large-scale evaluations, particularly in vivo studies. Herein, we report a one-pot gram-scale synthesis of cynandione A. The key step of this synthesis is a regioselective conjugate addition of acetyl bisphenol to a benzoquinone substrate, which has been mechanistically explored using density functional theory (DFT) calculations. The significant energetic differences at the transition states among the possible pathways indicate the C3 position of the acetyl bisphenol nucleophile as the exclusive site of addition. Through careful optimization, the one-pot synthesis affords cynandione A in a gram scale with a high yield. This method presents a practical, and scalable approach for synthesizing cynandione A with excellent pot economy.</p>","PeriodicalId":9831,"journal":{"name":"ChemistryOpen","volume":" ","pages":"e202500001"},"PeriodicalIF":2.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143718119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ChemistryOpenPub Date : 2025-03-24DOI: 10.1002/open.202400493
Mahzad Irandoust, Afrooz Anbaraki, Zahra Dindar, Atiyeh Ghasemi, Ali Akbar Saboury, Saeed Rayati, Arefeh Seyedarabi
{"title":"Concentration-Based Analysis of Metal-Induced Tau Fibrillar versus non-fibrillar Aggregation: Implications for Neurotoxicity in Alzheimer's Disease.","authors":"Mahzad Irandoust, Afrooz Anbaraki, Zahra Dindar, Atiyeh Ghasemi, Ali Akbar Saboury, Saeed Rayati, Arefeh Seyedarabi","doi":"10.1002/open.202400493","DOIUrl":"https://doi.org/10.1002/open.202400493","url":null,"abstract":"<p><p>Tau protein aggregation is the most significant factor in Alzheimer's disease (AD) pathogenesis, and the accumulation of metal ions in the brain is considered a key factor in the development of this disease. Tau protein exhibits two distinct aggregate structures: fibrillar and non-fibrillar aggregates. In this study, we conducted the first detailed study of the interactions of tau protein with three different concentrations of Zn<sup>2+</sup>, Cu<sup>2+</sup>, and Fe<sup>3+</sup>ions. Our findings demonstrate that low concentrations (0.01 mM) of these metal ions promote tau fibrillation, while higher concentrations (1 mM) induce non-fibrillar aggregates. We have investigated the structural changes of tau by using advanced techniques such as SDS-PAGE, DTNB, AFM, CD and fluorescence spectroscopy. At low concentrations, Zn<sup>2+</sup> ions produced shorter fibrils, whereas Cu<sup>2+</sup> and Fe<sup>3+</sup> ions resulted in longer fibrils. CD showed increased β-sheet structures with a decrease in random coil content. Interestingly, Cu<sup>2+</sup> ions caused a significant decrease in neuronal viability. Our data highlights a new approach that illuminates the different ways in which the metal ions distinctively cause tau fibrillar versus non-fibrillar aggregates, linked to neurotoxicity and neurodegeneration.</p>","PeriodicalId":9831,"journal":{"name":"ChemistryOpen","volume":" ","pages":"e202400493"},"PeriodicalIF":2.5,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143691061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ChemistryOpenPub Date : 2025-03-20DOI: 10.1002/open.202500040
Elaheh Akbarzadeh, M Saeed Abaee, Yazdanbakhsh L Nosood, Mohammad M Mojtahedi, Klaus Harms, Zahra Shabani
{"title":"Aqueous/Nonaqueous DBU Mixtures: Versatile Switching Media for Chemoselective Aldol, Baylis-Hillman, and Aldol Condensation Reactions.","authors":"Elaheh Akbarzadeh, M Saeed Abaee, Yazdanbakhsh L Nosood, Mohammad M Mojtahedi, Klaus Harms, Zahra Shabani","doi":"10.1002/open.202500040","DOIUrl":"https://doi.org/10.1002/open.202500040","url":null,"abstract":"<p><p>Isophorone is a relatively small molecule with several neighboring reacting sites, making it susceptible to various competing reactions with aldehydes, including aldol, Baylis-Hillman (BH), aldol condensation, and Michael addition reactions. In the present work, we have designed a switchable 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-catalyzed procedure, where the reaction of isophorone with aldehydes is guided chemoselectively toward either aldol, BH, or aldol condensation reactions, depending on the use of water and/or heat. This controllable divergency likely stems from the ability to tune the dual nucleophilicity/basicity characters of the DBU/H<sub>2</sub>O medium. In other words, the nucleophilicity of DBU plays a crucial role in directing the process toward the formation of the BH adducts in the absence of water. At the same time, the aldol pathway dominates when water is present. The conditions were amenable for tandem processes, as demonstrated for an aldol condensation/Diels-Alder sequence.</p>","PeriodicalId":9831,"journal":{"name":"ChemistryOpen","volume":" ","pages":"e202500040"},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143662645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Chemically Driven Contraction and Elongation: Interconversion between Molecular Figure of Eight.","authors":"Sanjaya Kumar Moharana, Radhakrishna Ratha, Chandra Shekhar Purohit","doi":"10.1002/open.202500081","DOIUrl":"https://doi.org/10.1002/open.202500081","url":null,"abstract":"<p><p>A 90-membered macrocycle having two functional moiety, diphenyl-phenanthroline (dpp) and two tri-dentate pyridine-diamide (pda) as templating center has been synthesized from precursor molecules via amide bond formation in 10 steps. dpp and pda are arranged alternatively around the macrocycle in a sequence of dpp-pda-dpp-pda and demeostrated orthogonal behaviour, when treated with transition metal such as Cu(I) and Co(III): It forms figure of eight complexes selectively between dpp units and pda units respectively due to the geomtric preferance. This makes the macrocycle operates in bimodal manner. Interconversion between figure of eight complexes has been witnessed by metal-exchange via demetalation and subsequent re-metalation between orthogonal templating centres. Removal of Cu(I) template is performed using a common and less toxic reagent NH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>NH<sub>2</sub> and Co(III) by Zn/CH<sub>3</sub>COOH at RT.</p>","PeriodicalId":9831,"journal":{"name":"ChemistryOpen","volume":" ","pages":"e202500081"},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143662647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Title: Identification of Redox State Based on the Difference in Solvation Dynamics.","authors":"Yasuhiro Kato, Jelena Muncan, Yoshinori Hirano, Hiroko Yamamoto, Roumiana Tsenkova, Masato Yasui","doi":"10.1002/open.202400278","DOIUrl":"https://doi.org/10.1002/open.202400278","url":null,"abstract":"<p><p>Oxidation-reduction (Redox) reactions are crucial for many biological processes, yet there is no method available to evaluate redox states in a non-invasive, continuous manner. Here we introduce a novel approach to distinguish between reduced and oxidized states of glutathione (GSH and GSSG, respectively) using aquaphotomics near-infrared (NIR) spectroscopy and multivariate analysis. We identified clear differences in NIR spectra reflecting not only glutathione itself, but different redox states of glutathione based on the spectral features of water molecular conformations interacting with the reaction site. Molecular dynamic simulations also revealed the difference in water molecule coordination and hydration numbers around the reaction site. This approach not only sheds light on the significance of water molecules in redox reactions but also enables non-destructive, continuous assessment of redox states, with potential applications for bioreactor optimization.</p>","PeriodicalId":9831,"journal":{"name":"ChemistryOpen","volume":" ","pages":"e202400278"},"PeriodicalIF":2.5,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143656313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ChemistryOpenPub Date : 2025-03-15DOI: 10.1002/open.202500060
Kumsal Eroğlu, Ömer Tahir Günkara, Wim Dehaen
{"title":"Synthesis of Thieno[2,3-c]pyridine Derivatives by 1,2,3-Triazole-Mediated Metal-Free Denitrogenative Transformation Reaction.","authors":"Kumsal Eroğlu, Ömer Tahir Günkara, Wim Dehaen","doi":"10.1002/open.202500060","DOIUrl":"https://doi.org/10.1002/open.202500060","url":null,"abstract":"<p><p>In this study, we report the synthesis of thieno[2,3-c]pyridine derivatives by a metal-free method via fused 1,2,3-triazoles. In the synthesis of this skeleton using a three-step method, we first obtained 1-(2,2-dimethoxyethyl)-5-(thiophen-2-yl)-1H-1,2,3-triazole through a one-pot triazolation reaction and in the next step, we synthesized the thieno[2,3-c][1,2,3]triazolo[1,5-ɑ]pyridine compound using a modified Pomeranz-Fritsch reaction. In the final step, the synthesis of thieno[2,3-c]pyridine derivatives was achieved in good yield via acid-mediated denitrogenative transformation reactions. This mild condition synthetic process has enabled access to the title compounds, of which limited examples have been reported until now in the literature. Thus, the syntheses of 7-(substituted methyl)thieno[2,3-c]pyridine, thieno[2,3-c]pyridine-7-ylmethyl esters, and imidazo[1,5-ɑ]thieno[2,3-c]pyridine derivatives have been successfully achieved.</p>","PeriodicalId":9831,"journal":{"name":"ChemistryOpen","volume":" ","pages":"e202500060"},"PeriodicalIF":2.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143633792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ChemistryOpenPub Date : 2025-03-15DOI: 10.1002/open.202400490
S Mato, S Municio, J L Alonso, E R Alonso, I León
{"title":"Elucidating the Three-Dimensional Structure of Piracetam through Rotational Spectroscopy.","authors":"S Mato, S Municio, J L Alonso, E R Alonso, I León","doi":"10.1002/open.202400490","DOIUrl":"https://doi.org/10.1002/open.202400490","url":null,"abstract":"<p><p>Herein we report on the most stable structures adopted by piracetam, a nootropic drug, in isolated conditions. A chirped pulse Fourier transform microwave spectrometer (CP-FTMW) coupled with a laser ablation source has been employed to explore the broadband rotational spectrum of piracetam in the 6.0-14.0 GHz range. Two conformers have been observed. The most stable conformer of piracetam adopts an exo configuration of the ring and is mainly stabilized through a N-H⋅⋅⋅⋅⋅⋅O=C hydrogen bond between the amide group and the rings' carbonyl oxygen. The second conformer is close in stability and only differs in the endo disposition of the ring. The results show a low interconversion barrier between both conformers.</p>","PeriodicalId":9831,"journal":{"name":"ChemistryOpen","volume":" ","pages":"e202400490"},"PeriodicalIF":2.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143633765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ChemistryOpenPub Date : 2025-03-10DOI: 10.1002/open.202580301
Christoph Oleszak, Christian L. Ritterhoff, Bernd Meyer, Norbert Jux
{"title":"Front Cover: Panchromatic PAH-Porphyrin Hybrids with a Step-Wise Increasing π-System (ChemistryOpen 3/2025)","authors":"Christoph Oleszak, Christian L. Ritterhoff, Bernd Meyer, Norbert Jux","doi":"10.1002/open.202580301","DOIUrl":"https://doi.org/10.1002/open.202580301","url":null,"abstract":"<p><b>In the Front Cover</b>, two futuristic-looking machines make use of their robotic limbs to assemble glowing aromatic fragments around a Nickel-porphyrin. In this way, the modular approach of the synthetic strategy toward π-extended porphyrin-PAH hybrids is underlined. The machine to the right also contains several five-ring motifs to further highlight the <i>β</i>-<i>meso</i>-fusion step the work is centered around. The cover art was designed and made by Christoph Oleszak. More details can be found in the Research article by Bernd Meyer, Norbert Jux, and co-workers (DOI: 10.1002/open.202400481).<figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure>\u0000 </p>","PeriodicalId":9831,"journal":{"name":"ChemistryOpen","volume":"14 3","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/open.202580301","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ChemistryOpenPub Date : 2025-03-05DOI: 10.1002/open.202400394
Xiwei Liu, Hui Zhang
{"title":"A Flexible and Stretchable Triboelectric Nanogenerator with Agarose/P(HEA-co-AA)-Al/NaCl Electrodes for Bio-Mechanical Energy Harvesting and Fall Detection.","authors":"Xiwei Liu, Hui Zhang","doi":"10.1002/open.202400394","DOIUrl":"https://doi.org/10.1002/open.202400394","url":null,"abstract":"<p><p>Recent advancements in wearable electronics for fall detection have shown significant potential, yet challenges remain in developing reliable, energy-efficient systems capable of continuous monitoring in real-world conditions. In this work, a double-network (DN) conductive hydrogel, comprising NaCl-coordinated agarose and poly (2-hydroxyethyl acrylate-co-acrylic acid) (Agarose/P(HEA-co-AA)-Al/NaCl) (APA-hydrogel), was synthesized. The agarose forms a stable first network, while the second network is established by P(HEA-co-AA) through aluminum ion coordination. Immersion in NaCl solution leads to the formation of hydrated sodium ions ([Na(H<sub>2</sub>O)n]<sup>+</sup>), which are anchored within the hydrogel matrix via hydrogen bonding and metal coordination. The resulting APA-hydrogel was applied as a triboelectric nanogenerator (APA-TENG), demonstrating excellent performance with an open-circuit voltage of 900 V, a short-circuit current of 73.42 μA, and a peak power output of 3.52 mW at a 3 MΩ load. APA-TENG shows strong potential for energy harvesting and powering low-power devices, as well as real-time sensing for motion and fall detection, making it highly suitable for wearable and assistive technologies powered by human activity.</p>","PeriodicalId":9831,"journal":{"name":"ChemistryOpen","volume":" ","pages":"e202400394"},"PeriodicalIF":2.5,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143556019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}