Results 51 to 60 of about 12,340 (258)

A new and efficient methodology for olefin epoxidation catalyzed by supported cobalt nanoparticles

Beilstein Journal of Organic Chemistry, 2021
A new heterogeneous catalytic system consisting of cobalt nanoparticles (CoNPs) supported on MgO and tert-butyl hydroperoxide (TBHP) as oxidant is presented.
Lucía Rossi-Fernández, Viviana Dorn, Gabriel Radivoy   +2 more
doaj   +1 more source

Strain‐Adaptive Dielectric Metamaterials via Bioinspired “Ligament‐Bone” Architecture for Ultrahigh‐Energy Capacitive Storage

Advanced Science, EarlyView.
A bioinspired strain‐adaptive ligament‐bone architecture achieves record‐high energy density of 26.1 J cm−3 and 90% efficiency at 600 MV m−1, coupled with a Young's modulus of 2.13 GPa. ABSTRACT Polymer dielectrics for capacitive energy storage face fundamental trade‐offs between breakdown strength, energy density, efficiency, and mechanical robustness.
Jian Wang, Xinyu Wang, Jiabao Wang, Biyun Peng, Yifei Zhang, Ning Zhu, Xin Hu   +6 more
wiley   +1 more source

3-[2-(Oxiran-2-yl)ethyl]-1-{4-[(2-oxiran-2-yl)ethoxy]benzyl}imidazolium bis(Trifluoromethane)sulfonimide

Molbank, 2018
The synthesis of 3-[2-(oxiran-2-yl)ethyl]-1-{4-[(2-oxiran-2-yl)ethoxy]benzyl}imidazolium bis(trifluoromethane)sulfonimide was achieved in seven steps with an overall yield of 63%.
Charline Chardin, Jacques Rouden, Sébastien Livi, Jérôme Baudoux   +3 more
doaj   +1 more source

Regioselectivity in the Ring Opening of Epoxides for the Synthesis of Aminocyclitols from D-(-)-Quinic Acid

Molecules, 2012
Efficient syntheses of four aminocyclitols are reported. Each synthesis is accomplished in eight steps starting from D-(-)-quinic acid. The key step involves a highly regioselective ring opening of epoxides by sodium azide.
Shu-Yu Yang, Tzenge-Lien Shih
doaj   +1 more source

Facile Conversion of Epoxides to 1,2-Diacetates with NaOAc•3H2O/Ac2O System [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2016
This study represents a highly efficient and regioselective ring-opening of epoxides with acetic anhydride in the presence of NaOAc·3H2O at solvent-free conditions.
Masumeh Gilanizadeh, Behzad Zeynizadeh
doaj  

Synthesis with Perfect Atom Economy: Generation of Furan Derivatives by 1,3-Dipolar Cycloaddition of Acetylenedicarboxylates at Cyclooctynes

Molecules, 2014
Cyclooctyne and cycloocten-5-yne undergo, at room temperature, a 1,3-dipolar cycloaddition with dialkyl acetylenedicarboxylates 1a,b to generate furan-derived short-lived intermediates 2, which can be trapped by two additional equivalents of 1a,b or ...
Klaus Banert, Sandra Bochmann, Andreas Ihle, Oliver Plefka, Florian Taubert, Tina Walther, Marcus Korb, Tobias Rüffer, Heinrich Lang   +8 more
doaj   +1 more source

Silver-catalyzed direct conversion of epoxides into cyclopropanes using N-triftosylhydrazones

Nature Communications
Epoxides, as a prominent small ring O-heterocyclic and the privileged pharmacophores for medicinal chemistry, have recently represented an ideal substrate for the development of single-atom replacements.
Linxuan Li, Paramasivam Sivaguru, Dandan Wei, Menglin Liu, Qingwen Zhu, Shuai Dong, Emanuele Casali, Nan Li, Giuseppe Zanoni, Xihe Bi   +9 more
doaj   +1 more source

Human CYP4F3s are the main catalysts in the oxidation of fatty acid epoxides

Journal of Lipid Research, 2004
CYP4F isoforms are involved in the oxidation of important cellular mediators such as leukotriene B4 (LTB4) and prostaglandins. The proinflammatory agent LTB4 and cytotoxic leukotoxins have been associated with several inflammatory diseases.
Valérie Le Quéré, Emmanuelle Plée-Gautier, Philippe Potin, Stéphanie Madec, Jean-Pierre Salaün   +4 more
doaj   +1 more source

Characterization of Oxygenated Heterocyclic Compounds and in vitro Antioxidant Activity of Pomelo Essential Oil

Drug Design, Development and Therapy, 2021
Guijie Li,1,* Yujiao Cheng,1,* Tenghui Zhang,2 Yingzhuo Li,3 Leng Han,1 Guolu Liang4 1Citrus Research Institute, Southwest University, Chongqing, People’s Republic of China; 2Chengdu Centre Testing International Group Co., Ltd., Chengdu, People ...
Li G, Cheng Y, Zhang T, Li Y, Han L, Liang G   +5 more
doaj  

A Dual Perspective of the Action of Lysine on Soybean Oil Oxidation Process Obtained by Combining ¹H NMR and LC–MS: Antioxidant Effect and Generation of Lysine–Aldehyde Adducts

Antioxidants, 2019
Little is still known about both the effect of amino acids on the oxidation course of edible oils and the modifications that the former may undergo during this process.
Ana S. Martin-Rubio, Patricia Sopelana, Fumie Nakashima, Takahiro Shibata, Koji Uchida, María D. Guillén   +5 more
doaj   +1 more source