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Journal of Flow Chemistry最新文献

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Continuous synthesis of boron-doped carbon nitride supported silver nanoparticles in an ultrasound-assisted coiled flow inverter microreactor 在超声辅助盘流变频微反应器中连续合成掺硼氮化碳支撑的银纳米粒子
IF 2 4区 化学
Journal of Flow Chemistry Pub Date : 2023-12-22 DOI: 10.1007/s41981-023-00300-1
Yu-tian Tao, Ke-Jun Wu, Chao-Hong He
{"title":"Continuous synthesis of boron-doped carbon nitride supported silver nanoparticles in an ultrasound-assisted coiled flow inverter microreactor","authors":"Yu-tian Tao,&nbsp;Ke-Jun Wu,&nbsp;Chao-Hong He","doi":"10.1007/s41981-023-00300-1","DOIUrl":"10.1007/s41981-023-00300-1","url":null,"abstract":"<div><p>The combination of ultrasound and microreactors for the synthesis of nanomaterials is becoming increasingly popular, but effectively altering the ultrasonic field at the microscale to control the crystallization process remains a challenge. Herein, we investigated numerically and experimentally the effects of the ultrasonic field on the synthesis of boron-doped carbon nitride supported silver nanoparticles based on our homemade ultrasound-assisted coiled flow inverter microreactor (UCFIR). Specifically, the ultrasound promotes the radial mixing in the coiled flow inverter microreactor, even under low Reynolds number 10, resulting in better control over the crystallization process. The effects of key parameters, such as ultrasonic field distribution and ultrasonic power, on the particle size and size distribution of Ag/B-g-C<sub>3</sub>N<sub>4</sub> have been demonstrated. The results show that when the ultrasound transducer is positioned on the ‘abc’ sides, the Ag/B-g-C<sub>3</sub>N<sub>4</sub> with small and uniform Ag particles (4.12 ± 1.12 nm) can be obtained. As ultrasound power increased (0–176 W) and residence time decreased (17.5–140 s), the size of silver nanoparticles decreased, and their distribution narrowed.</p></div>","PeriodicalId":630,"journal":{"name":"Journal of Flow Chemistry","volume":"14 1","pages":"177 - 196"},"PeriodicalIF":2.0,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138944876","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}
引用次数: 0
Continuous-flow Synthesis of Anisotropic Plasmonic Nanostructures 各向异性质子纳米结构的连续流合成
IF 2 4区 化学
Journal of Flow Chemistry Pub Date : 2023-12-18 DOI: 10.1007/s41981-023-00299-5
Vini Singh, Perali Ramu Sridhar, R. Singh
{"title":"Continuous-flow Synthesis of Anisotropic Plasmonic Nanostructures","authors":"Vini Singh,&nbsp;Perali Ramu Sridhar,&nbsp;R. Singh","doi":"10.1007/s41981-023-00299-5","DOIUrl":"10.1007/s41981-023-00299-5","url":null,"abstract":"<div><p>Owing to enhanced light-matter interactions and unique optical properties, plasmonic metal nanostructures have garnered extensive research interest and use in wide range of applications. A 3D-printed device for the synthesis of seed-mediated anisotropic gold (Au) nanoparticles (NPs) by droplet-based method is demonstrated. The miniaturized device was used to synthesize Au NPs by using three different reducing agents of different concentrations at two different flow rates and study the evolution of morphology of NPs. The device channel geometry and configuration allowed on-chip chemical syntheses of Au nanomaterials with good uniformity in shape and size. XRD and zeta potential measurement confirmed face-centered cubic structure and negative  surface charge of the synthesized nanomaterials. TEM studies confirmed flower-, urchin- and spindle-shaped morphologies of Au NPs synthesized on using different concentrations of reducing agent. Additionally, computational study to deduce the residence time of the droplets in the device and estimate the electric field distribution around the anisotropic Au NPs is also shown.</p></div>","PeriodicalId":630,"journal":{"name":"Journal of Flow Chemistry","volume":"14 2","pages":"397 - 407"},"PeriodicalIF":2.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138746048","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}
引用次数: 0
Two photons are better than one: continuous flow synthesis of ꞵ-lactones through a doubly photochemically-activated Paternò-Büchi reaction 两个光子胜过一个光子：通过双重光化学激活的 Paternò-Büchi 反应连续流合成ꞵ-内酯
IF 2 4区 化学
Journal of Flow Chemistry Pub Date : 2023-12-15 DOI: 10.1007/s41981-023-00297-7
Federica Minuto, Emanuele Farinini, Serena De Negri, Riccardo Leardi, Davide Ravelli, Pavlo Solokha, Andrea Basso
{"title":"Two photons are better than one: continuous flow synthesis of ꞵ-lactones through a doubly photochemically-activated Paternò-Büchi reaction","authors":"Federica Minuto,&nbsp;Emanuele Farinini,&nbsp;Serena De Negri,&nbsp;Riccardo Leardi,&nbsp;Davide Ravelli,&nbsp;Pavlo Solokha,&nbsp;Andrea Basso","doi":"10.1007/s41981-023-00297-7","DOIUrl":"10.1007/s41981-023-00297-7","url":null,"abstract":"<div><p>In this paper we report a [2 + 2] cycloaddition reaction between ketenes and benzils, characterized by an unusual double photochemical activation triggered by visible light. Employment of a flow system and optimization of reaction conditions through Design of Experiments resulted in moderate to good yields of the corresponding β-lactones. A thorough computational analysis allowed to elucidate the mechanism of the reaction and justify the observed diastereoselectivity. The reaction was also successfully tested with mixed benzils, showing complete regioselectivity.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":630,"journal":{"name":"Journal of Flow Chemistry","volume":"14 1","pages":"149 - 159"},"PeriodicalIF":2.0,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s41981-023-00297-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138683379","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}
引用次数: 0
HO-SAS catalyzed protection and deprotection of aldehydes and alcohols in continuous flow reactors 连续流反应器中的 HO-SAS 催化醛和醇的保护和脱保护作用
IF 2 4区 化学
Journal of Flow Chemistry Pub Date : 2023-12-13 DOI: 10.1007/s41981-023-00298-6
Takahide Fukuyama, Toshiaki Hirano, Kengo Takamura
{"title":"HO-SAS catalyzed protection and deprotection of aldehydes and alcohols in continuous flow reactors","authors":"Takahide Fukuyama,&nbsp;Toshiaki Hirano,&nbsp;Kengo Takamura","doi":"10.1007/s41981-023-00298-6","DOIUrl":"10.1007/s41981-023-00298-6","url":null,"abstract":"<div><p>We investigated the flow acetalization of aldehydes and THP protection of alcohols using sulfonic acid-functionalized silica gel having hydroxy moiety (HO-SAS) as the solid acid catalyst. The reaction both aliphatic and aromatic aldehydes reacted with methanol within 5 min of residence time to give acetalization product in good to excellent yield. THP protection of primary, secondary, and tertiary alcohols proceeded well to the corresponding products. Both reactions did not require a neutralization process. Scalable syntheses were also achieved with continuous operation. The deprotection reactions were also effective using HO-SAS packed flow reactors.</p></div>","PeriodicalId":630,"journal":{"name":"Journal of Flow Chemistry","volume":"14 1","pages":"297 - 301"},"PeriodicalIF":2.0,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139003559","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}
引用次数: 0
Methyl acetate production by reactive distillation using a vertical plate microdistillator 竖板式微蒸馏器反应精馏生产醋酸甲酯
IF 2 4区 化学
Journal of Flow Chemistry Pub Date : 2023-12-01 DOI: 10.1007/s41981-023-00294-w
Yosuke Muranaka, Taisuke Maki, Soma Matsumoto, Kazuhiro Mae
{"title":"Methyl acetate production by reactive distillation using a vertical plate microdistillator","authors":"Yosuke Muranaka,&nbsp;Taisuke Maki,&nbsp;Soma Matsumoto,&nbsp;Kazuhiro Mae","doi":"10.1007/s41981-023-00294-w","DOIUrl":"10.1007/s41981-023-00294-w","url":null,"abstract":"<div><p>Micro-distillation is one of the unit operation technologies that are looking toward innovation through on-site and on-demand production system. In this study, a simple structure microdistillator consisting of some plates was applied to reactive distillation, and its potential was investigated. As a target reaction, the heterogeneous esterification between acetic acid and methanol using a solid acid catalyst was employed. The effects of feedstock supply rate, feedstock composition, and device temperature on operation stability and conversion were examined. By controlling the feedstock supply rate and temperature properly, a stable operation with a conversion of approximately 100% was successfully achieved. The amount of methyl acetate produced per weight of catalyst was greater in the reactive distillation using a microdistillator than in the batch reaction, soon after the start of the reaction. Thus, it was demonstrated that the reactive distillation using a microdistillator was able to achieve highly efficient reactions with short reaction time and small amounts of catalyst.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":630,"journal":{"name":"Journal of Flow Chemistry","volume":"14 1","pages":"289 - 295"},"PeriodicalIF":2.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138528263","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}
引用次数: 0
Telescoped synthesis of vicinal diamines via ring-opening of electrochemically generated aziridines in flow 流动中电化学生成的aziridine开环套筒合成邻二胺
IF 2 4区 化学
Journal of Flow Chemistry Pub Date : 2023-11-29 DOI: 10.1007/s41981-023-00296-8
Marharyta Laktsevich-Iskryk, Anastasiya Krech, Mihhail Fokin, Mariliis Kimm, Tatsiana Jarg, Timothy Noël, Maksim Ošeka
{"title":"Telescoped synthesis of vicinal diamines via ring-opening of electrochemically generated aziridines in flow","authors":"Marharyta Laktsevich-Iskryk,&nbsp;Anastasiya Krech,&nbsp;Mihhail Fokin,&nbsp;Mariliis Kimm,&nbsp;Tatsiana Jarg,&nbsp;Timothy Noël,&nbsp;Maksim Ošeka","doi":"10.1007/s41981-023-00296-8","DOIUrl":"10.1007/s41981-023-00296-8","url":null,"abstract":"<div><p>A vicinal diamine motif can be found in numerous natural compounds and pharmaceuticals, making it an important synthetic target. Herein, we report a telescoped synthesis of vicinal diamines under continuous flow conditions. This approach involves the electrochemical aziridination of alkenes with primary amines, followed by the strain-release driven ring-opening using various nitrogen nucleophiles. The efficacy of the developed method was demonstrated through the synthesis of diverse symmetrically and non-symmetrically substituted vicinal diamines, as well as vicinal amino azides, which can be further hydrogenated to diamines in flow. Additionally, <i>O</i>-centered nucleophiles were employed for the ring-opening of aziridines in our telescoped synthesis, yielding vicinal amino ethers and alcohol. This process offers a streamlined and efficient pathway for the direct synthesis of valuable products from readily available starting materials, bypassing the isolation of unstable aziridine intermediates.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":630,"journal":{"name":"Journal of Flow Chemistry","volume":"14 1","pages":"139 - 147"},"PeriodicalIF":2.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138528137","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}
引用次数: 0
Impact of gas-solid direct contact on gas-liquid-solid reaction performance in a flow reactor 流动反应器中气固直接接触对气液固反应性能的影响
IF 2 4区 化学
Journal of Flow Chemistry Pub Date : 2023-11-28 DOI: 10.1007/s41981-023-00295-9
Shusaku Asano, Hiroyuki Miyamura, Mizuki Matsushita, Shinji Kudo, Shū Kobayashi, Jun-ichiro Hayashi
{"title":"Impact of gas-solid direct contact on gas-liquid-solid reaction performance in a flow reactor","authors":"Shusaku Asano,&nbsp;Hiroyuki Miyamura,&nbsp;Mizuki Matsushita,&nbsp;Shinji Kudo,&nbsp;Shū Kobayashi,&nbsp;Jun-ichiro Hayashi","doi":"10.1007/s41981-023-00295-9","DOIUrl":"10.1007/s41981-023-00295-9","url":null,"abstract":"<p>Although gas-liquid-solid reactions, such as catalytic hydrogenation, have a long history, a fundamental understanding of the flow behavior and its effect on the reaction is lacking for flow chemistry applications using powder catalysts. This study revealed the distinctive effect of gas-solid direct contact on the surface of a powder catalyst. Direct gas–solid contact accelerates the reaction beyond the theoretical maximum of the batch reaction system, where gaseous species are supplied to the catalyst surface after dissolution into the liquid. The benefit of direct contact is further pronounced in systems with low-solubility gaseous species. Liquid holdup analysis revealed that the micro-concavities of the catalyst support is crucial for sustaining the liquid using capillary forces and supplying the liquid substrate to the catalyst surface even under high gas flow rate conditions. The gas-to-liquid flow rate ratio (G/L) is a decisive factor for direct gas–solid contact, whereas the flow direction, whether upflow or downflow, has no impact on powder catalysts with a size of a few hundred microns.</p>","PeriodicalId":630,"journal":{"name":"Journal of Flow Chemistry","volume":"14 1","pages":"329 - 335"},"PeriodicalIF":2.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138528146","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}
引用次数: 0
Enhancing N-arylation productivity: the amplified potential of electrophotocatalysis in flow 提高n -芳基化生产力:流动中光电催化的放大潜力
IF 2 4区 化学
Journal of Flow Chemistry Pub Date : 2023-11-28 DOI: 10.1007/s41981-023-00290-0
Jolien De Ketelaere, Thomas S. A. Heugebaert
{"title":"Enhancing N-arylation productivity: the amplified potential of electrophotocatalysis in flow","authors":"Jolien De Ketelaere,&nbsp;Thomas S. A. Heugebaert","doi":"10.1007/s41981-023-00290-0","DOIUrl":"10.1007/s41981-023-00290-0","url":null,"abstract":"<div><p>The recent advances in the area of electrophotocatalysis (EPC) show that it is a highly suitable technique to yield greener and more sustainable organic synthesis. The overall productivity of EPC however is constrained by a multitude of practical limitations, which impose difficulties in effectively harmonizing the photochemical and electrochemical steps, let alone in accelerating both steps simultaneously. In this contribution, we have tackled these limitations by developing a parallel plate flow cell that permits the execution of EPC in continuous flow. By using a transparent electrode, such as fluorine-doped tin oxide (FTO) or indium tin oxide (ITO) coated glass, the interelectrode distance could be reduced while improving photon absorption. By enhancing both the photochemical and electrochemical steps simultaneously, a notable increase in productivity and space–time-yield (a ten-fold and 300-fold improvement, respectively) of the <i>N</i>-arylation of different azoles was observed. In addition, this was achieved in a single-pass process under electrolyte-free conditions.</p></div>","PeriodicalId":630,"journal":{"name":"Journal of Flow Chemistry","volume":"14 1","pages":"119 - 128"},"PeriodicalIF":2.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138528166","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}
引用次数: 0
Investigations on the continuous flow generation of 2,6-dichloro-N-fluoropyridinium tetrafluoroborate using F2 gas F2气连续流动生成2,6-二氯- n -氟吡啶的研究
IF 2 4区 化学
Journal of Flow Chemistry Pub Date : 2023-11-28 DOI: 10.1007/s41981-023-00291-z
Kevin Simon, Desiree Znidar, Gabriel Glotz, Doris Dallinger, C. Oliver Kappe
{"title":"Investigations on the continuous flow generation of 2,6-dichloro-N-fluoropyridinium tetrafluoroborate using F2 gas","authors":"Kevin Simon,&nbsp;Desiree Znidar,&nbsp;Gabriel Glotz,&nbsp;Doris Dallinger,&nbsp;C. Oliver Kappe","doi":"10.1007/s41981-023-00291-z","DOIUrl":"10.1007/s41981-023-00291-z","url":null,"abstract":"<div><p>An explorative study on the continuous flow generation of the N-F reagent 2,6-dichloro-1-fluoro-pyridinium tetrafluoroborate from 2-6-dichloropyridine and 10% F<sub>2</sub>/N<sub>2</sub> and its telescoped downstream electrophilic fluorination reaction with an enamine is reported. The 2-step procedure was performed in a modular lab-scale silicon carbide flow reactor, which safely allowed processing corrosive F<sub>2</sub> and precise temperature control. Both reaction sequences turned out to be very fast when carried out in flow at − 10 °C: the N-F generation step could be done within 7.9 s and only 6.6 s were necessary for the fluorination of the enamine.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":630,"journal":{"name":"Journal of Flow Chemistry","volume":"13 4","pages":"427 - 434"},"PeriodicalIF":2.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s41981-023-00291-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138528147","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}
引用次数: 0
Asymmetric electrochemical synthesis in flow 流动中的不对称电化学合成
IF 2 4区 化学
Journal of Flow Chemistry Pub Date : 2023-11-28 DOI: 10.1007/s41981-023-00293-x
Daniele Mazzarella
{"title":"Asymmetric electrochemical synthesis in flow","authors":"Daniele Mazzarella","doi":"10.1007/s41981-023-00293-x","DOIUrl":"10.1007/s41981-023-00293-x","url":null,"abstract":"<div><p>We are currently experiencing a resurgence in the realm of electrochemical organic synthesis, driven by the transformative potential of conducting redox chemistry under mild conditions through the simple use of electrons, thereby circumventing the use of harmful reductants and oxidants. This renaissance is further bolstered by the fusion of electrochemistry with flow chemistry, which not only grants precise control over reaction parameters but also promotes sustainability and heightened reproducibility. Despite these promising advancements, the application of flow electrochemistry to steer asymmetric processes remains in its nascent stage. This perspective delves into the limited contributions to date, shedding light on critical challenges and presenting prospective solutions that are essential for fully unleashing the untapped potential of this field.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":630,"journal":{"name":"Journal of Flow Chemistry","volume":"14 1","pages":"357 - 366"},"PeriodicalIF":2.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s41981-023-00293-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139225074","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}
引用次数: 0
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