Results 11 to 20 of about 135,103 (314)
Ammonia Synthesis at Room Temperature and Atmospheric Pressure from N2: A Boron‐Radical Approach
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 Boron‐centered radicals, generated by reduction of R2BCl derivatives, react with N2 all the way to borylamine formation. DFT calculations rationalize the reduction/functionalization process, involving N−N bond splitting. Hydrolysis of the mixture yields NH4+. Radical addition to N2 provides a new strategy for N2 fixation.
Soukaina Bennaamane +6 more
wiley +1 more source
Superchaotropic Nano‐ion Binding as a Gelation Motif in Cellulose Ether Solutions
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 Nano‐ions, like polyoxometalates and boron clusters, co‐assemble strongly with non‐ionic solutes in water driven by the chaotropic effect. Here, nano‐ion assembly with non‐ionic cellulose ethers (CE) is shown to result in unprecedented thickening effects and gelation of CE‐solutions. An interplay of electrostatic repulsion and attraction between chains
Max Hohenschutz +4 more
wiley +1 more source
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 A highly efficient stereoinvertive nucleophilic substitution at the quaternary carbon stereocenter of cyclopropyl carbinol derivatives using water, alcohols and phenols as nucleophiles is reported. A variety of highly sterically hindered tertiary alkyl ethers and alcohols with adjacent tertiary carbon stereocenters are obtained in good yields with ...
Xu Chen, Kaushalendra Patel, Ilan Marek
wiley +1 more source
Fluorine‐Directed Automated Mannoside Assembly
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 Motivated by the importance of fluorination in drug discovery, fluorine‐directed automated glycan assembly (AFGA) is disclosed. This strategy leverages the C(sp3)−F bond at C2 to enable α‐stereocontrolled glycosylation that eliminates the reliance on O‐based directing groups.
Charlotte S. Teschers, Ryan Gilmour
wiley +1 more source
Enriching Surface‐Accessible CO2 in the Zero‐Gap Anion‐Exchange‐Membrane‐Based CO2 Electrolyzer
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 A descriptor called the surface‐accessible CO2 concentration ([CO2]SA) is developed, which enables to indicate the transient state of the local [CO2]/[OH−] ratio and helps define the limits of CO2‐to‐CO conversion. Three general tactics are developed to enrich [CO2]SA for high current electrolysis: (1) increasing the catalyst layer thickness, (2 ...
Qiucheng Xu +6 more
wiley +1 more source
Predicting Collagen Triple Helix Stability through Additive Effects of Terminal Residues and Caps
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 Collagen model peptides are like a construction set. The stability of collagen triple helices is critically determined by the frame, terminal residues, capping groups, and their charge state. The effects are additive and can be used to predict the melting temperatures of new collagen trimers.
Tomas Fiala +4 more
wiley +1 more source
Photocatalytic Alkylation of C(sp3)−H Bonds Using Sulfonylhydrazones**
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 Herein, we report the realization of an alkyl‐alkyl cross‐coupling reaction, which combines N‐sulfonyl hydrazones and C(sp3)−H donors through a diarylketone‐enabled photocatalytic hydrogen atom transfer and a subsequent fragmentation of the obtained alkylated hydrazide.
Antonio Pulcinella +4 more
wiley +1 more source
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 Through the interplay of X‐ray spectroscopy and computational analysis, we show that gold +I and +III complexes, despite their physically distinct electronic structures, tend to activate substrates to similar extents. We focus in particular on the role of electron‐sharing covalency of the metal‐ligand bonds and provide an explanation for the often ...
Evgeniya A. Trifonova +5 more
wiley +1 more source
GM Crops & Food, 2023 This paper focuses on analyzing discussions related to Genetically Modified Organisms (GMOs) on Twitter, with a specific focus on the spread of misinformation and conspiracy theories. The authors collected and analyzed 1,048,274 English tweets related to GMOs between January 2020 and December 2022 using the Twitter API.
Erokhin, Dmitry, Komendantova, Nadejda
openaire +5 more sources
Twitter, time and emotions [PDF]
Royal Society Open Science, 2021 The study of temporal trajectories of emotions shared in tweets has shown that both positive and negative emotions follow nonlinear circadian (24 h) and circaseptan (7-day) patterns. But to this point, such findings could be instrument-dependent as they rely exclusively on coding using the Linguistic Inquiry Word Count. Further, research has shown that
Eric Mayor, Lucas M. Bietti
openaire +5 more sources