Results 91 to 100 of about 2,257 (201)

Phosphate and polyphosphate anions recognition by a dinuclear copper(II) complex of an unsymmetrical squaramide [PDF]

, 2019
International audienceIn the search for receptors suitable for the recognition of phosphate or polyphosphate anions a new unsymmetrical squaramide-based ligand bearing dipicolylamine (dpa) and ethylpiperazine units (L) was designed and prepared. The acid-
Esteban, David, Lamosa, Pedro, Esteves, Catarina, Tripier, Raphaël, Platas-Iglesias, Carlos, Esteban-Gómez, David, Delgado, Rita, Bernard, Hélène, Esteves, Catarina V., Costa, Judite   +9 more
core   +1 more source

Bifunctional Squaramide‐Catalyzed Oxidative Kinetic Resolution: Simultaneous Access to Axially Chiral Thioether and Sulfoxide

Advanced Science
Axially chiral thioethers and sulfoxides emerge as two pivotal classes of ligands and organocatalysts, which have remarkable features in the stereoinduction of various asymmetric transformations. However, the lack of easy methods to access such molecules
Wei Wen, Chang‐Lin Yang, Zhu‐Lian Wu, Dong‐Rong Xiao, Qi‐Xiang Guo   +4 more
doaj   +1 more source

Amino acid – Squaramide conjugates as anion binding receptors

Results in Chemistry
Squaramides have garnered significant attention as anion binding motifs and have become a popular supramolecular synthon owing to their unique structural features and propensity to form strong hydrogen bond interactions particularly with anionic species.
Hua Tong, Farhad Ali Mohammed, Robert B.P. Elmes   +2 more
doaj   +1 more source

Quinine-Derived Thiourea and Squaramide Catalyzed Conjugate Addition of alpha-Nitrophosphonates to Enones: Asymmetric Synthesis of Quaternary alpha-Aminophosphonates

, 2015
Conjugate addition of a-nitrophosphonates to enones was carried out in the presence of two sets of organocatalysts, viz. a quinine-thiourea and a quinine-squaramide.
Kalisankar Bera, NAMBOOTHIRI, INN, Namboothiri, Irishi N. N., BERA, K, Bera, Kalisankar, Irishi N. N. Namboothiri   +5 more
core   +1 more source

Squaramide-Catalyzed Asymmetric Michael Addition/Cyclization Reaction for the Synthesis of Chiral Bisspiro Barbituric Acid–Oxindole Derivatives

Molecules
An efficient stereoselective strategy for the synthesis of chiral bisspiro barbituric acid–oxindole derivatives was developed. The asymmetric Michael addition/cyclization tandem reaction between benzylidene barbituric acids and oxindolylmalonitriles was ...
De-Jun Qiao, Da-Ming Du
doaj   +1 more source

A novel calix[4]arene-based bifunctional squaramide organocatalyst for enantioselective Michael addition of acetylacetone to nitroolefins [PDF]

, 2016
A new chiral calix[4]arene-based organocatalyst 3 bearing bis-squaramide moieties was designed and synthesized from p-tert-butylcalix[4] arene.
Vural, Ummu, Durmaz, Mustafa, Sirit, Abdulkadir   +2 more
core   +1 more source

Pressure-sensitive adhesives with squaramide as a building block

Squaramide pressure-sensitive adhesives are developed via squaramate aminolysis, presenting a modular design platform and showcasing tunable adhesion–cohesion balance dictated by side-chain ...
Jin Zhu, Baochen Wang, Kaini Yang, Yachun Su, Tielei Li, Zhengqing Kong   +5 more
core   +1 more source

Quinine-Derived Thiourea and Squaramide Catalyzed Conjugate Addition of α‑Nitrophosphonates to Enones: Asymmetric Synthesis of Quaternary α‑Aminophosphonates

, 2016
Conjugate addition of α-nitrophosphonates to enones was carried out in the presence of two sets of organocatalysts, viz. a quinine-thiourea and a quinine-squaramide.
Irishi N. N. Namboothiri (1376568), Kalisankar Bera (1376571)   +1 more
core   +1 more source

Squaramide-based interpenetrated networks for load-bearing applications [PDF]

This thesis explores squaramide-based supramolecular polymers and hydrogels, enhancing their mechanical strength for 3D cell culture. We first examined how the hydrophilic-hydrophobic balance and hydrogen bonds in tripodal squaramide monomers influence ...
Chen, Y.
core  

Preparation, Solid-State Characterization, and Computational Study of a Crown Ether Attached to a Squaramide.

[eng] Crystals of a disecondary squaramide covalently linked to a crown ether presents a great variety of inter- and intramolecular nonbonded interactions including C-H/ð contacts, C-HâââO and N-HâââO hydrogen bonds, and ð-ð stacking between squaramide ...
Garau Rosselló, Carolina, Orell, Maria, Frontera Beccaria, Antonio, Quiñonero Santiago, David, Mata, Ignasi, Morey Salvà, Jeroni, Molins, Elies   +6 more
core   +1 more source