Reactions最新文献_第3页

Increased Yields of the Guanine Oxidative Damage Product Imidazolone Following Exposure to LED Light 暴露于 LED 光后鸟嘌呤氧化损伤产物咪唑啉酮的产量增加

Reactions Pub Date : 2023-12-16 DOI: 10.3390/reactions4040046

Taishu Kawada, Moka Maehara, Katsuhito Kino

引用次数: 0

One-Pot Reactions of Triethyl Orthoformate with Amines 正甲酸三乙酯与胺的单锅反应

Reactions Pub Date : 2023-12-02 DOI: 10.3390/reactions4040045

Elina Marinho

引用次数: 0

Chlorophyll Sensitization of TiO2: A Mini-Review 二氧化钛的叶绿素敏化：微型综述

Reactions Pub Date : 2023-12-01 DOI: 10.3390/reactions4040044

M. Fuziki, Â. Tusset, Onélia A. A. dos Santos, G. Lenzi

引用次数: 0

Review on the Synthesis, Recyclability, Degradability, Self-Healability and Potential Applications of Reversible Imine Bond Containing Biobased Epoxy Thermosets 含可逆亚胺键的生物基环氧热固性塑料的合成、可回收性、降解性、自愈性和潜在应用综述

Reactions Pub Date : 2023-12-01 DOI: 10.3390/reactions4040043

Jabed Hossen Emon, Muhammad Abdur Rashid, Md. Ariful Islam, Md. Nabiul Hasan, M. K. Patoary

{"title":"Review on the Synthesis, Recyclability, Degradability, Self-Healability and Potential Applications of Reversible Imine Bond Containing Biobased Epoxy Thermosets","authors":"Jabed Hossen Emon, Muhammad Abdur Rashid, Md. Ariful Islam, Md. Nabiul Hasan, M. K. Patoary","doi":"10.3390/reactions4040043","DOIUrl":"https://doi.org/10.3390/reactions4040043","url":null,"abstract":"Epoxy thermosets need to be designed for simple recycling and biomass resource utilization in order to be fully sustainable building materials. The development of covalent adaptive networks (CANs) using adaptive covalent chemistry (ACC) may be helpful in this regard. Several reversible covalent bonds are incorporated into the epoxy polymer to overcome the challenge of reprocessability or recyclability, degradability and self-healability. The imine bond, also referred to as the Schiff base, is one of the reversible covalent bonds that can participate in both associative and dissociative reactions. This opens up possibilities for mechanical and chemical recycling as well as self-healing. This review summarises the progress related to the synthesis and mechanical and thermal properties of epoxy thermosets based on reversible imine bonds derived from different sustainable resources over the past few decades. The feedstocks, physical and thermal properties, recycling conditions, degradability and self-healability of the biomass epoxy thermosets are addressed along with the main obstacles, prospective improvements and potential applications.","PeriodicalId":20873,"journal":{"name":"Reactions","volume":" 90","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138612005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A New Pd-Based Catalytic System for the Reductive Carbonylation of Nitrobenzene to Form N-(4-hydroxyphenyl)acetamide Selectively in One Pot 一种新型钯基催化体系，用于一锅选择性还原硝基苯羰基化形成 N-(4-羟基苯基)乙酰胺

Reactions Pub Date : 2023-11-17 DOI: 10.3390/reactions4040042

A. Vavasori, Marco Capponi, L. Ronchin

引用次数: 0

Silver Nanoparticles Coated with Recombinant Human Epidermal Growth Factor: Synthesis, Characterization, Liberation and Anti-Escherichia coli Activity 涂有重组人表皮生长因子的银纳米粒子：银纳米粒子的合成、表征、释放和抗大肠杆菌活性

Reactions Pub Date : 2023-11-15 DOI: 10.3390/reactions4040041

Layla M. Gonzales Matushita, Luis Palomino, J. Rodriguez-Reyes

{"title":"Silver Nanoparticles Coated with Recombinant Human Epidermal Growth Factor: Synthesis, Characterization, Liberation and Anti-Escherichia coli Activity","authors":"Layla M. Gonzales Matushita, Luis Palomino, J. Rodriguez-Reyes","doi":"10.3390/reactions4040041","DOIUrl":"https://doi.org/10.3390/reactions4040041","url":null,"abstract":"Epithelial tissue regeneration may be favored if the tissue receives both therapeutic agents such as recombinant human epidermal growth factor (rhEGF) and, simultaneously, antibacterial materials capable of reducing the risk of infections. Herein, we synthesized silver nanoparticles (AgNPs), which are well-known antibacterial materials, and impregnate them with rhEGF in order to study a bio-nanomaterial of potential interest for epithelial tissue regeneration. A suspension of Ag NPs is prepared by the chemical reduction method, employing sodium citrate as both a reducer and capping agent. The AgNPs suspension is mixed with a saline solution containing rhEGF, producing rhEGF-coated Ag NPs with rhEGF loadings between 0.1 and 0.4% w/w. ELISA assays of supernatants demonstrate that, in all studied cases, over 90% of the added rhEGF forms part of the coating, evidencing a high efficiency in impregnation. During the preparation of rhEGF-coated Ag NPs, no significant changes are observed on the nanoparticles, which are characterized by UV-Vis spectroscopy, transmission electron microscopy (TEM) and infrared spectroscopy. The liberation of rhEGF in vitro was followed for 72 h, finding that approximately 1% of rhEGF that is present is released. The rhEGF-coated AgNPs shows antibacterial activity against E. coli, although such activity is decreased with respect to that observed from naked AgNPs. Having confirmed the possibility of simultaneously liberating rhEGF and reducing the proliferation of bacteria, this work helps to support the use of rhEGF-loaded metallic nanoparticles for tissue regeneration.","PeriodicalId":20873,"journal":{"name":"Reactions","volume":"31 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139272068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Control of a Methanol Catalytic Membrane Reformer 甲醇催化膜重整器的实验控制

Reactions Pub Date : 2023-11-06 DOI: 10.3390/reactions4040040

Alejandro Cifuentes, Maria Serra, Ricardo Torres, Jordi Llorca

引用次数: 0

Glycerol Hydrogenolysis to Bio-Propanol: Catalytic Activity and Kinetic Model for Ni/C Modified with Al(H2PO4)3 甘油氢解制生物丙醇:Al(H2PO4)3改性Ni/C的催化活性及动力学模型

Reactions Pub Date : 2023-11-05 DOI: 10.3390/reactions4040039

Martín N. Gatti, Federico M. Perez, Gerardo F. Santori, Francisco Pompeo

{"title":"Glycerol Hydrogenolysis to Bio-Propanol: Catalytic Activity and Kinetic Model for Ni/C Modified with Al(H2PO4)3","authors":"Martín N. Gatti, Federico M. Perez, Gerardo F. Santori, Francisco Pompeo","doi":"10.3390/reactions4040039","DOIUrl":"https://doi.org/10.3390/reactions4040039","url":null,"abstract":"The aim of the present research is to investigate the effect of different operation variables in the hydrogenolysis of glycerol to 1-propanol and to develop a simple kinetic model useful for the design of the reactor. For this purpose, a carbon-based composite was impregnated with 4 wt.% of Al(H2PO4)3 (CPAl) and used as a support to prepare a Ni catalyst. The support and the catalyst were characterized by BET, XRD, NMR, potentiometric titration, isopropanol decomposition reaction, TEM and TPR analysis. The catalytic tests were carried out at 220–260 °C and 0.5–4 MPa of H2 initial pressure varying the glycerol concentration in aqueous solutions between 30 and 80 wt.%. The presence of aluminum phosphates in the Ni/CPAl catalyst moderates the surface acidity and the formation of Ni2P leads to a high selectivity towards 1-propanol. In this sense, the Ni/CPAl catalyst showed total glycerol conversion and 74% selectivity towards 1-propanol at 260 °C and 2 MPa of H2 initial pressure using 30 wt.% glycerol aqueous solution and 8 h of reaction time. A slight increase in particle size from 10 to 12 nm was observed after a first reaction cycle, but no changes in acidity and structure were observed. Based on these results, a power-law kinetic model was proposed. For glycerol consumption, partial orders of 0.07, 0.68 and −0.98 were determined with respect to glycerol, H2 and water, and an apparent activation energy of 89 kJ mol−1 was estimated. The results obtained indicate that the model fits the experimental concentration values well and can predict them with an average error of less than 7%.","PeriodicalId":20873,"journal":{"name":"Reactions","volume":"35 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135725304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Conversion of Biomass-Derived Molecules into Alkyl Levulinates Using Heterogeneous Catalysts 利用多相催化剂将生物质衍生分子转化为乙酰丙酸烷基酯

Reactions Pub Date : 2023-11-01 DOI: 10.3390/reactions4040038

Nobutaka Yamanaka, Shogo Shimazu

{"title":"Conversion of Biomass-Derived Molecules into Alkyl Levulinates Using Heterogeneous Catalysts","authors":"Nobutaka Yamanaka, Shogo Shimazu","doi":"10.3390/reactions4040038","DOIUrl":"https://doi.org/10.3390/reactions4040038","url":null,"abstract":"Alkyl levulinates are promising and versatile biomass-derived chemicals, which are utilized as fuel additives, flavoring agents, fragrances, solvents, and precursors for synthesizing valuable γ-valerolactone. A method for synthesizing alkyl levulinates involves the esterification of levulinic acid with the corresponding alkyl alcohols in the presence of solid acid catalysts that have abundant Brønsted acid sites. Alkyl levulinates can also be synthesized from other biomass-derived molecules such as furfuryl alcohol and furfural via alcoholysis and one-pot conversion, respectively. Thus far, various heterogeneous catalysts have been developed for the conversion of the biomass-derived molecules (levulinic acid, furfuryl alcohol, and furfural) into alkyl levulinates. To obtain the target products in high yields, numerous strategies have been employed including increasing Brønsted acidity, dispersing and incorporating Brønsted acid sites, inducing the formation of mesopores, and inducing a synergistic effect of metal–Brønsted acid sites that are present on a catalyst surface. Here, we summarily reviewed the performances of the heterogeneous catalysts in the conversions, describing the design and development of the heterogeneous catalysts that ensured the excellent yield of alkyl levulinates.","PeriodicalId":20873,"journal":{"name":"Reactions","volume":"150 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135271495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Palladium-Catalyzed Cross-Coupling Reaction of Bis(cyclopentadienyl)diaryltitaniums with Terminal Alkynes 钯催化双(环戊二烯基)二芳基钛与末端炔的交叉偶联反应

Reactions Pub Date : 2023-10-19 DOI: 10.3390/reactions4040037

Yuki Murata, Yuya Nishi, Mio Matsumura, Shuji Yasuike

{"title":"Palladium-Catalyzed Cross-Coupling Reaction of Bis(cyclopentadienyl)diaryltitaniums with Terminal Alkynes","authors":"Yuki Murata, Yuya Nishi, Mio Matsumura, Shuji Yasuike","doi":"10.3390/reactions4040037","DOIUrl":"https://doi.org/10.3390/reactions4040037","url":null,"abstract":"Organotitanium compounds find application in diverse reactions, including carbon–carbon bond formation and oxidation. While titanium (IV) compounds have been used in various applications, the potential of bis(cyclopentadienyl)diaryltitanium in cross-coupling reactions remains unexplored. This study focuses on Sonogashira-type cross-coupling reactions involving terminal alkynes and organotitanium compounds. Diaryltitanocenes were synthesized using titanocene dichloride with lithium intermediates derived from aryl iodide. Under open-flask conditions, reactions of diphenyltitanocenes with ethynylbenzene in the presence of 20 mol% Pd(OAc)2 in DMF produced coupling products in a remarkable 99% yield. Various diaryltitanocenes and alkynes under standard conditions yielded corresponding cross-coupling products with moderate to good yields. Notably, the Sonogashira-type alkynylation proceeds under mild conditions, including open-flask conditions, and without the need for a base. Furthermore, this cross-coupling is atom-economical and involves the active participation of both aryl groups of the diaryltitanocene. Remarkably, this study presents the first example of a Sonogashira-type cross-coupling using titanium compounds as pseudo-halides.","PeriodicalId":20873,"journal":{"name":"Reactions","volume":"7 2-3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135728782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0