Results 61 to 70 of about 13,032 (188)

Dual Effect of Steric Hindrance in Non‐Aqueous Amine Absorbents: Navigating the Trade‐Off Between Kinetics and Thermodynamics for Efficient CO2 Capture

Advanced Science, EarlyView.
This study elucidates how steric hindrance in amines creates a dual effect in CO2 capture: it thermodynamically favors the reaction by shifting the pathway from carbamate to alkyl carbonate formation, increasing capacity and lowering regeneration heat, while simultaneously slightly slowing the kinetics.
Xiaoyi Gao, Bin Xu, Xi Tang, Muyi Li, Cong Luo, Fan Wu, Xiaoshan Li, Liqi Zhang, Wen Chen   +8 more
wiley   +1 more source

Designer drugs: aspectos analíticos e biológicos

Química Nova, 2012
In the recent years, analytical toxicologists have been facing difficulties in detecting designer drugs due to the chemical modifications on the existing structures and the speed in which they are released into the market, requiring the development and ...
Rachel Bulcão, Solange Cristina Garcia, Renata Pereira Limberger, Marília Baierle, Marcelo Dutra Arbo, Alice Aparecida da Matta Chasin, Flávia Valladão Thiesen, Rejane Tavares   +7 more
doaj   +1 more source

Reconstructed Polyamide Nanolayers via Two‐Stage Interfacial Polymerization Engineering for Precise Ion Sieving

Advanced Science, EarlyView.
A reconstructed polyamide nanofiltration membrane is engineered via a two‐stage interfacial polymerization strategy for lithium extraction from complex brines. Incorporated bidentate quaternary ammonium monomers enable synergistic steric and electrostatic effects within sub‐nanometer channels, achieving 60‐fold lithium enrichment and demonstrating ...
Shuzhen Zhao, Liheng Dai, Feidong Yang, Bowen Li, Pengfei Zhang, Yanyan Liu, Mengyang Hu, Kecheng Guan, Ryosuke Takagi, Hideto Matsuyama   +9 more
wiley   +1 more source

Fast‐Track to Functional Neurons: Accessible and Minimalistic Neurogenin 2 Programming of Human iPSCs

Advanced NanoBiomed Research, EarlyView.
Fast‐track to functional human induced pluripotent stem cell (hiPSC)‐derived neurons: This colony‐initiated differentiation approach induces neurogenin 2 overexpression in dense hiPSC colonies (day 0), resulting in a structural reorganization of the colonies (day 2) before they are replated as single cells.
Jann Harberts, Malte Siegmund, Emma Wollesen, Caroline Viola, Kim Krieg, Ole Pless, Roey Elnathan, Robert Zierold, Robert H. Blick, Nicolas H. Voelcker   +9 more
wiley   +1 more source

Investigation of piperazines as human carbonic anhydrase I, II, IV and VII activators

Journal of Enzyme Inhibition and Medicinal Chemistry, 2018
Four human (h) carbonic anhydrase isoforms (CA, EC 4.2.1.1), hCA I, II, IV, and VII, were investigated for their activation profile with piperazines belonging to various classes, such as N-aryl-, N-alkyl-, N-acyl-piperazines as well as 2,4-disubstituted ...
Andrea Angeli, Niccolò Chiaramonte, Dina Manetti, Maria Novella Romanelli, Claudiu T. Supuran   +4 more
doaj   +1 more source

Mehr als nur ein biochemischer Puffer: Tris als Designer und Regulator einer Metall–Oxo‐Assemblierung

Angewandte Chemie, EarlyView.
Tris(hydroxymethyl)aminomethan – schematisch als Oktopus dargestellt – wirkt gleichzeitig als Alkoxy‐Ligand, Chelator und strukturleitender Puffer und programmiert in Wasser die Speziation, die Nukleation und die Heterometall‐Insertion von Polyoxometallaten. ZUSAMMENFASSUNG Polyoxometallate (POMs; molekulare Metall–Oxo‐Cluster) werden typischerweise in
Nadiia I. Gumerova, Annette Rompel
wiley   +1 more source

Iridium-Catalyzed Asymmetric Ring-Opening of Oxabenzonorbornadienes with N-Substituted Piperazine Nucleophiles

Molecules, 2015
Iridium-catalyzed asymmetric ring-opening of oxabenzonorbornadienes with N-substituted piperazines was described. The reaction afforded the corresponding ring-opening products in high yields and moderate enantioselectivities in the presence of 2.5 mol % [
Wen Yang, Renshi Luo, Dingqiao Yang
doaj   +1 more source

Simplified Procedure for General Synthesis of Monosubstituted Piperazines—From a Batch Reaction Vessel to a Flow (Microwave) Reactor

Molecules, 2020
We reported a novel simplified synthetic procedure for the preparation of monosubstituted piperazine derivatives which can now be easily prepared in a one-pot-one-step way from a protonated piperazine with no need of introduction of a protecting group ...
Dana Němečková, Eva Havránková, Jan Šimbera, Richard Ševčík, Pavel Pazdera   +4 more
doaj   +1 more source

More Than a Buffer in Biochemistry: Tris as an Architect and Gatekeeper of Metal–Oxo Assembly

Angewandte Chemie International Edition, EarlyView.
Tris(hydroxymethyl)aminomethane, depicted as an octopus, acts as an alkoxy ligand, chelator, and structure‐directing buffer that programs polyoxometalate's speciation, nucleation, and heterometal insertion in aqueous solution. ABSTRACT Polyoxometalates (POMs, molecular metal–oxo clusters) are typically studied and applied in aqueous media, where ...
Nadiia I. Gumerova, Annette Rompel
wiley   +1 more source

Enantioselective Synthesis of Sulfinamidines via Asymmetric Rhodium–Catalyzed Imidation of Sulfenamides

ChemistryEurope, EarlyView.
In this work, a catalytic enantioselective imidation approach is presented for the preparation of enantioenriched sulfinamidines from sulfenamides, employing a chiral dirhodium(II) tetracarboxylate catalyst. This method enables the imidation of N,N‐bisalkyl sulfenamides in yields of up to 98% and enantiomeric ratios up to 98:2, with a catalyst loading ...
Michael Andresini, Théo Bissonnier, Juline Courtois, Pascal Retailleau, Benjamin Darses, Jean‐François Poisson, Tanguy Saget, Philippe Dauban   +7 more
wiley   +1 more source