Results 41 to 50 of about 2,257 (201)

Bis-Squaramide-Based [2]Rotaxane Hosts for Anion Recognition. [PDF]

Chemistry
The first examples of bis‐squaramide axle containing [2]rotaxanes linked via rigid aryl and flexible alkyl spacers synthesised using copper(I) catalysed active metal template methodology are reported.
Arun A, Docker A, Beer PD.
europepmc   +2 more sources

High‐Affinity Anion Binding by Steroidal Squaramide Receptors [PDF]

Angewandte Chemie International Edition, 2015
AbstractExceptionally powerful anion receptors have been constructed by placing squaramide groups in axial positions on a steroidal framework. The steroid preorganizes the squaramide NH groups such that they can act cooperatively on a bound anion, while maintaining solubility in nonpolar media.
Edwards, Sophie J., Valkenier, Hennie, Busschaert, Nathalie, Gale, Philip A., Davis, Anthony P.   +4 more
openaire   +6 more sources

Organocatalytic Enantioselective Conjugate Addition of Nitromethane to Benzylidene-2-Benzoyl Acetate: Asymmetric Synthesis of ABT – 627, an Endothelin Receptor Antagonist

Frontiers in Chemistry, 2020
First catalytic and enantioselective conjugate addition of nitromethane to benzylidene-2-benzoyl acetate has been developed using dihydroquinine derived squaramide catalyst with moderate to high selectivities.
Saumen Hajra, Sk Mohammad Aziz, Bibekananda Jana, Bibekananda Jana, Sunit Hazra   +4 more
doaj   +1 more source

Molecular Plastics Programming: Squaramide as a Building Block [PDF]

, 2023
The plastics structure-property correspondence has been conventionally identified through either forward discovery chemistry approach or reverse analysis physics approach. The viewing of each monomer unit as a non-divisible entity limits these approaches
Jin, Zhu, Tielei, Li, Benfa, Chu, Baochen, Wang   +3 more
core   +2 more sources

Organocatalytic asymmetric addition of malonates to unsaturated 1,4-diketones

Beilstein Journal of Organic Chemistry, 2012
The organocatalytic Michael addition of malonates to symmetric unsaturated 1,4-diketones catalyzed by thiourea and squaramide derivatives with Cinchona alkaloids afforded the formation of a new C–C bond in high yields (up to 98%) and enantiomeric ...
Sergei Žari, Tiiu Kailas, Marina Kudrjashova, Mario Öeren, Ivar Järving, Toomas Tamm, Margus Lopp, Tõnis Kanger   +7 more
doaj   +1 more source

Squaramide—Naphthalimide Conjugates as “Turn-On” Fluorescent Sensors for Bromide Through an Aggregation-Disaggregation Approach

Frontiers in Chemistry, 2019
The syntheses of two new squaramide-naphthalimide conjugates (SQ1 and SQ2) are reported where both compounds have been shown to act as selective fluorescence “turn on” probes for bromide in aqueous DMSO solution through a disaggregation induced response.
Lokesh K. Kumawat, Anthony A. Abogunrin, Michelle Kickham, Michelle Kickham, Jyotsna Pardeshi, Orla Fenelon, Martina Schroeder, Martina Schroeder, Robert B. P. Elmes, Robert B. P. Elmes   +9 more
doaj   +1 more source

Potentiometric Sensing of Nonsteroidal Painkillers by Acyclic Squaramide Ionophores

ACS Sensors, 2023
We report here a small library of a new type of acyclic squaramide receptors (L1-L5) as selective ionophores for the detection of ketoprofen and naproxen anions (KF- and NS-, respectively) in aqueous media. 1H NMR binding studies show a high affinity of these squaramide receptors toward KF- and NS-, suggesting the formation of H-bonds between the two ...
Giacomo Picci, Sara Farotto, Jessica Milia, Claudia Caltagirone, Vito Lippolis, Maria Carla Aragoni, Corrado Di Natale, Roberto Paolesse, Larisa Lvova   +8 more
openaire   +3 more sources

Spatial Orientation‐Dependent Double Hydrogen Bond/Photoredox Cooperative Catalysis in Metal–Organic Frameworks

Angewandte Chemie, Volume 138, Issue 32, 3 August 2026.
We report a heterogeneous double hydrogen bond/photoredox synergistic catalysis, wherein the flexibility and spatial orientation of catalytic centers, rather than catalyst activity, play a dominant role in catalytic performance. ABSTRACT Catalyst activity is typically the primary priority in designing a catalytic system. The higher catalyst activity is
Jing Ouyang, Sze Lam Lam, Chao Li, Peiqi Zhang, Le Yang, Zhiyi Yang, Teng‐Teng Chen, Xueliang Xiao, Yangjian Quan   +8 more
wiley   +2 more sources

On the Importance of Squaramide and Squarate Derivatives as Metal–Organic Framework Building Blocks

Crystals
In this review article the synthesis and solid state structure of squaramide/squarate based metal–organic frameworks (MOFs) are analyzed and discussed.
Catalina Nicolau, María de las Nieves Piña, Jeroni Morey, Antonio Bauzá   +3 more
doaj   +1 more source

In Vitro Evaluation of the Squaramide-Conjugated Fibroblast Activation Protein Inhibitor-Based Agents AAZTA⁵.SA.FAPi and DOTA.SA.FAPi

Molecules, 2021
Recently, the first squaramide-(SA) containing FAP inhibitor-derived radiotracers were introduced. DATA5m.SA.FAPi and DOTA.SA.FAPi with their non-radioactive complexes showed high affinity and selectivity for FAP.
Euy Sung Moon, Yentl Van Rymenant, Sandeep Battan, Joni De Loose, An Bracke, Pieter Van der Veken, Ingrid De Meester, Frank Rösch   +7 more
doaj   +1 more source