Article
Polymer Science
Tianfo Guo, Haoying Tong, Zhenjiang Li, Jie Sun, Yongqiang Li, Rui Yan, Bo Liu, Zhihao Zhang, Yuejia Zhu, Kai Guo
Summary: A polybenzoxazine (PBz) anchored with an N-4'-pyridyl group on the backbone was prepared and characterized, showing efficient catalytic activity in acylation, silylation, and tritylation reactions at room temperature. The catalyst exhibited high catalytic activity, good yields, and retained 85% activity after 4 recycles, demonstrating its potential as a versatile polymeric catalyst for various reactions.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Chemistry, Physical
Jiaqi Qiu, Jinjin Huang, Xiaokang Zhu, Yuting Min, Dongming Qi, Tao Chen
Summary: The study demonstrates the fabrication of highly efficient and recyclable micellar nanoreactors via self-assembly of catalyst-containing amphiphilic copolymers in water, using a one-step strategy of polymerization-induced self-assembly. The nanoreactors showed high catalytic activity and easy recyclability, making them promising for green organic transformations.
MOLECULAR CATALYSIS
(2022)
Article
Polymer Science
Jiaqi Qiu, Fuliang Meng, Maolin Wang, Jinjin Huang, Chengzhan Wang, Xiao Li, Guang Yang, Zan Hua, Tao Chen
Summary: The study introduces a strategy of fabricating highly efficient and recyclable nanoreactors through macromolecular self-assembly, which exhibit excellent dispersity and catalytic activity in water, achieving high conversion and selectivity in alcohol acylation reactions. The high catalytic efficiency of the nanoreactors may be attributed to enhanced interaction between reactants and catalyst, mimicking enzyme-like behavior. Additionally, the catalyst can be easily recovered and reused multiple times with high activity.
Article
Chemistry, Multidisciplinary
Titouan Desrues, Jeremy Merad, Daniela Andrei, Jean-Marc Pons, Jean-Luc Parrain, Maurice Medebielle, Adrien Quintard, Cyril Bressy
Summary: This study reported an enantioselective organocatalyzed acylation of alpha,alpha-difluorohydrins using a commercially available chiral isothiourea, greatly improving the enantioselectivity of the kinetic resolution process through electrostatic fluorine-cation interactions. The method allows for the synthesis of various fluorinated alcohols with exquisite enantiocontrol, such as 4,4-difluoro-1,3-diols, as well as demonstrated compatibility between aromatic and fluorinated groups in providing enantioenriched adducts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Esteban Matador, Javier Iglesias-Siguenza, David Monge, Pedro Merino, Rosario Fernandez, Jose M. Lassaletta
Summary: A highly enantio- and diastereoselective thiourea-catalyzed dearomatization of isoquinolines has been developed using N-tert-butylhydrazones as key neutral reagents, leading to the formation of appealing dihydroisoquinoline derivatives with excellent stereocontrol. Experimental and computational data support the generation of highly ordered complexes that play a crucial role in the selective and high-yielding transformations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Organic
Titli Ghosh, Ananya Mukherji, Pavan K. Kancharla
Summary: Amines are used as additives to facilitate the host-guest chemistry between thiourea and the anions of Bronsted acids. The combination of DMAP/HCl/Schreiner's thiourea has been shown to have a synergistic effect in catalyzing dehydrative glycosylation. The variations in electronic effects of the cationic Bronsted acid part in the presence of chloride binding Schreiner's thiourea have been discussed using NMR and X-ray crystallographic techniques.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Stefanie Mayr, Hendrik Zipse
Summary: The relative rates of Lewis base-catalyzed acylation of aryl-substituted 1,2-diols with anhydrides of varying sizes have been determined. Depending on the anhydride reagent structure, the secondary hydroxyl group of the 1,2-diol reacts faster than the primary one. This preference is further enhanced in the second acylation step from monoesters to diesters through size and additional steric effects. The first acylation step is found to be up to 35 times faster than the second one for primary alcohols due to neighboring group effects.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Organic
Lijuan Qiao, Xin He, Lulu Yang, Kaki Raveendra Babu, Yong Wu, Yuhai Tang, Silong Xu
Summary: This study describes a DMAP-catalyzed [3+3] annulation reaction that synthesizes 2-pyrones through the reaction of cyclopropenones with alpha-bromoketones. The method is simple, convenient, and offers high yields with a wide scope of applicability. The reaction benefits from transition metal-free conditions, readily available starting materials, and excellent regioselectivity.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Julie Meimoun, Yupin Phuphuak, Remi Miyamachi, Yong Miao, Marc Bria, Cyril Rousseau, Guilherme Nogueira, Andreia Valente, Audrey Favrelle-Huret, Philippe Zinck
Summary: Cyclodextrins (CDs) are cyclic oligosaccharides widely used in various fields. This study successfully achieved quantitative functionalization of various types of CDs using 4-dimethylaminopyridine (DMAP) as a catalyst. The inclusion complex formed between DMAP and β-CD was characterized for the first time, and its association constant was estimated.
Article
Materials Science, Biomaterials
Daisy Mehta, Alankar Kafle, Tharamani C. Nagaiah
Summary: A non-enzymatic electrochemical biosensor was developed for highly sensitive detection of creatinine using copper nanoparticles supported over polymelamine formaldehyde. The sensor exhibited a wide detection range and high sensitivity, and achieved high recoveries in real samples.
JOURNAL OF MATERIALS CHEMISTRY B
(2023)
Article
Chemistry, Physical
Julia S. Schulze, Raoul D. Brand, Joachim G. C. Hering, Luise M. Riegger, Peter R. Schreiner, Bernd M. Smarsly
Summary: In this study, the immobilization of 4-dimethylaminopyridine (DMAP) on mesoporous silica particles and macro-mesoporous silica monoliths for continuous flow synthesis was reported. The immobilized DMAP derivatives were characterized and their catalytic performance was studied. The results showed that both materials achieved high conversion rates in continuous flow experiments, with the macro-mesoporous silica monoliths exhibiting lower pressures and higher turnover rates compared to packed bed reactors.
Article
Chemistry, Multidisciplinary
Alexander Seitz, Raffael C. C. Wende, Peter R. R. Schreiner
Summary: We describe the site-selective acetylation of partially protected monosaccharides using immobilized oligopeptide catalysts, synthesized via solid-phase peptide synthesis. The catalysts exhibit a reversed selectivity compared to N-methylimidazole and show high selectivity for various pyranosides. The catalysts demonstrate stability for multiple reaction cycles and can be easily reused after separation from the reaction solution. They can also be used in flow without any loss of reactivity and selectivity.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Applied
I-Ting Chen, Ren-You Guan, Jeng-Liang Han
Summary: In this study, a catalytic asymmetric vinylogous Mannich/annulation/acylation reaction was developed for the synthesis of chiral spiro-oxindole piperidine derivatives with polyaromatic scaffolds. The reaction provided the desired products in good yields and high enantioselectivity. DFT computational calculations were used to explain the mechanism and origin of the observed enantioselectivity and O-acetylated products.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Polymer Science
Thanchanok Ratvijitvech
Summary: Clean water is crucial for sustainable development, and water quality is influenced by organic dyes. Converting dyes to safer substances is important for water treatment. In this study, a catechol-based hypercrosslinked polymer was developed as a solid support for Fe and used as a heterogenous Fenton catalyst. The catalyst showed good catalytic activity for methylene blue degradation, with advantages such as reusability and low cost.
Article
Chemistry, Multidisciplinary
Masaru Kondo, Kento Nakamura, Chandu G. Krishnan, Hiroaki Sasai, Shinobu Takizawa
Summary: This study presents recent advances in photoswitchable chiral organocatalysts and their applications in the photomodulation of enantioselective reactions. Under appropriate light irradiation, the E/Z-photoisomerization of the photoresponsive units on the catalysts controls the catalytic activity and/or selectivity of the reactions. The study also elucidates the design, synthesis, and catalytic application of azobenzene BINOL-based photoswitchable chiral phase-transfer catalysts. This account provides insights into the appropriate design of a photoswitchable chiral organocatalyst for achieving good enantioselectivity and photocontrol.
Article
Chemistry, Physical
Wu Xia, Longsheng Huang, Xue Huang, Yiming Wang, Cuifen Lu, Guichun Yang, Zuxing Chen, Junqi Nie
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
(2016)
Article
Chemistry, Multidisciplinary
Wu Xia, Jin Wu, Jun-Chao Hu, Shanshan Sun, Ming-De Li, Hongfang Liu, Minhuan Lan, Feng Wang
Article
Chemistry, Physical
Wu Xia, Ying-Yi Ren, Jing Liu, Bo-Yi Deng, Feng Wang
Summary: The novel binuclear cobalt complex C1 can independently catalyze the conversion of CO2 to CO with high efficiency and selectivity. Electrochemical and spectroscopic studies revealed that the (CoCoI)-Co-I species generated by photoinduced electron transfer is the active species for CO2 conversion.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Xia Wu, Ren Yingyi, Liu Jing, Wang Feng
Summary: MPA-CdSe@chitosan assemblies enhance the efficiency and selectivity of photocatalytic CO2 to-CO conversion, and exhibit good stability.
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
(2022)
Article
Chemistry, Physical
Jin Wu, Wu Xia, Minhuan Lan, Xue-Jian Xing, Jun-Chao Hu, Li Huang, Jing Liu, Ying-Yi Ren, Hongfang Liu, Feng Wang
JOURNAL OF MATERIALS CHEMISTRY A
(2020)
Article
Chemistry, Applied
Xiaodan Wu, Zihan Wang, Guansong Shao, Bingyang Qin, Ying Wang, Tao Wang, Zhiguo Liu, Yujie Fu
Summary: In this study, a new type of cellulose-based ionic imprinting adsorbent was developed for the selective removal of cobalt ions. The adsorbent exhibited excellent adsorption performance, high cycling stability, and preferential selectivity for cobalt ions. The simple preparation method and promising application prospects make it a promising candidate for water treatment.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Article
Chemistry, Applied
Chandirasekar Shanmugam, Vanitha Marimuthu, Nagappan Rajendiran
Summary: In this study, monodispersed gold and silver nanoparticles were synthesized using cholic acid functionalized star poly(DL-lactide) as a capping and reducing agent. The synthesized materials were found to be effective heterogeneous catalysts for the reduction reaction.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Article
Chemistry, Applied
Bianca-Iulia Ciubotaru, Mirela-Fernanda Zaltariov, Mihaela Dascalu, Adrian Bele, Alexandra Bargan, Maria Cazacu
Summary: Porous networks were obtained using polysiloxanes pendant functionalized with aminopropyl groups. The addition of certain substances, such as ammonium bicarbonate and acetic acid, promoted the porosity and covalent cross-linking of the polymer. The resulting materials exhibited high dielectric permittivity and significant electrical output signal when subjected to compression, making them suitable for capacitive pressure sensors.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Article
Chemistry, Applied
Mohamed A. Zein, Basim H. Asghar, Abdulaziz M. Almohyawi, Norah F. Alqahtani, Ahmed Alharbi, J. Alkabli, Reda F. M. Elshaarawy, Lamia A. Ismail
Summary: In this study, new amphiphilic chitosan-thyme extract-nanosilver nanocomposites were prepared, which synergistically inhibited bacterial biofilm formation and bacterial proliferation. The nanocomposites disrupted bacterial cell membranes, causing cell death, and prevented biofilm formation. In addition, the nanocomposites exhibited good biocompatibility, making them potential candidates for biomedical applications.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Review
Chemistry, Applied
Norah F. Alqahtani
Summary: This review explores the potential of Imidazolium-based ionic liquids (ImILs) in improving the solubility, stability, and functionality of chitosan, and provides an overview of the types and preparation methods of functionalized imidazolium ionic liquids (FImILs). Additionally, it discusses the various opportunities offered by FImIL-chitosan derivatives.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Article
Chemistry, Applied
Olesya N. Zabegaeva, Alexey F. Kosolapov, Sergei L. Semjonov, Mariam G. Ezernitskaya, Egor S. Afanasyev, Ivan A. Godovikov, Alexander Chuchalov, Dmitriy A. Sapozhnikov
Summary: Polyimides are commonly used as primary protective coatings for optical fibers in high-temperature applications. However, the manufacturing process is complicated due to certain drawbacks. This study shows the potential use of polyamide-imides as highly reliable protective coatings for optical fibers.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Article
Chemistry, Applied
Luis Miguel Nunez Tapia, Pascal Thebault, Laurent Bischoff, Alain Ledoux, Florian Defontaine, Olivier Lesouhaitier, Fabrice Burel
Summary: A water soluble cationic bis-cyclocarbonate was prepared through a three steps procedure, and non-isocyanate polyurethanes were prepared in acetonitrile with high yields. The resulting materials exhibited good thermal properties and hydrophilic properties. The polyurethane thermoset showed high inhibition towards bacteria, and the bis-cyclocarbonate oligomer was found to be harmless to organisms.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
