Results 41 to 50 of about 10,693 (226)

Catalysis with Chalcogen Bonds

Angewandte Chemie International Edition, 2016
AbstractHerein, we introduce catalysts that operate with chalcogen bonds. Compared to conventional hydrogen bonds, chalcogen bonds are similar in strength but more directional and hydrophobic, thus ideal for precision catalysis in apolar solvents. For the transfer hydrogenation of quinolines and imines, rate enhancements well beyond a factor of 1000 ...
Sebastian Benz, Javier López‐Andarias, Jiri Mareda, Naomi Sakai, Stefan Matile   +4 more
openaire   +4 more sources

Selenonium Salt as a Catalyst for Nucleophilic Substitution Reactions in Water: Synthesis of Thiocyanites and Selenocyanates

Molecules, 2023
Organothiocyanates and selenocyanates are valuable compounds, both in terms of functional group interconversion and due to their biological activities. In this contribution, we report the synthesis of a series of these important substances in a mixture ...
Alix Y. Bastidas Ángel, Philipe Raphael O. Campos, Eduardo E. Alberto   +2 more
doaj   +1 more source

Review

, 2020
The chalcogen elements oxygen, sulfur, and selenium are essential constituents of side chain functions of natural amino acids. Conversely, no structural and biological function has been discovered so far for the heavier and more metallic tellurium ...
Agh R, Arai K, Baskakov IV, Creighton TE, Dittmer K, Du Vigneaud V, Janeček J, Metanis N, Musiol HJ, Muttenthaler M, Nygard B, O'Donnell ME, Welch M, Yang F   +13 more
core   +1 more source

Nature and strength of chalcogen–π bonds [PDF]

Physical Chemistry Chemical Physics, 2018
We have analyzed the chalcogen–π bonding mechanism in a systematic series of model systems through Kohn–Sham molecular orbital theory and a quantitative energy decomposition scheme.
Marco Bortoli, Shah Masood Ahmad, Trevor A. Hamlin, F. Matthias Bickelhaupt, Laura Orian   +4 more
openaire   +5 more sources

The Nature of Strong Chalcogen Bonds Involving Chalcogen‐Containing Heterocycles

Angewandte Chemie International Edition, 2020
AbstractChalcogen bonds are σ hole interactions and have been used in recent years as an alternative to hydrogen bonds. In general, the electrostatic potential at the chalcogen atom and orbital delocalization effects are made responsible for the orientation of the chalcogen bond. Here, we were able to show by means of SAPT calculations that neither the
Gebhard Haberhauer, Rolf Gleiter
openaire   +2 more sources

Theoretical Study of Intramolecular Interactions in Peri-Substituted Naphthalenes: Chalcogen and Hydrogen Bonds

Molecules, 2017
A theoretical study of the peri interactions, both intramolecular hydrogen (HB) and chalcogen bonds (YB), in 1-hydroxy-8YH-naphthalene, 1,4-dihydroxy-5,8-di-YH-naphthalene, and 1,5-dihydroxy-4,8-di-YH-naphthalene, with Y = O, S, and Se was carried out ...
Goar Sánchez–Sanz, Ibon Alkorta, José Elguero   +2 more
doaj   +1 more source

Sulfur-mediated chalcogen versus hydrogen bonds in proteins: a see-saw effect in the conformational space

QRB Discovery, 2023
Divalent sulfur (S) forms a chalcogen bond (Ch-bond) via its σ-holes and a hydrogen bond (H-bond) via its lone pairs. The relevance of these interactions and their interplay for protein structure and function is unclear.
Vishal Annasaheb Adhav, Sanket Satish Shelke, Pananghat Balanarayan, Kayarat Saikrishnan   +3 more
doaj   +1 more source

Noncovalent Bonds, Spectral and Thermal Properties of Substituted Thiazolo[2,3-b][1,3]thiazinium Triiodides

Crystals, 2019
The interrelation between noncovalent bonds and physicochemical properties is in the spotlight due to the practical aspects in the field of crystalline material design.
Irina Yushina, Natalya Tarasova, Dmitry Kim, Vladimir Sharutin, Ekaterina Bartashevich   +4 more
doaj   +1 more source

Synthesis and Biological Evaluation of S-, O- and Se-Containing Dispirooxindoles

Molecules, 2021
A series of novel S-, O- and Se-containing dispirooxindole derivatives has been synthesized using 1,3-dipolar cycloaddition reaction of azomethine ylide generated from isatines and sarcosine at the double C=C bond of 5-indolidene-2-chalcogen-imidazolones
Maksim Kukushkin, Vladimir Novotortsev, Vadim Filatov, Yan Ivanenkov, Dmitry Skvortsov, Mark Veselov, Radik Shafikov, Anna Moiseeva, Nikolay Zyk, Alexander Majouga, Elena Beloglazkina   +10 more
doaj   +1 more source

Anion Transport with Chalcogen Bonds

Journal of the American Chemical Society, 2016
In this report, we introduce synthetic anion transporters that operate with chalcogen bonds. Electron-deficient dithieno[3,2-b;2',3'-d]thiophenes (DTTs) are identified as ideal to bind anions in the focal point of the σ holes on the cofacial endocyclic sulfur atoms.
Benz, Sebastian, Macchione, Mariano, Verolet, Quentin, Mareda, Jiri, Sakai, Naomi, Matile, Stefan   +5 more
openaire   +3 more sources