Savvas G. Chalkidis

One‐Pot Synthesis of 2‐Arylthio‐2‐Thiazolines via a Propargylamine Cyclization—Chan‐Lam C─S Arylation Strategy

Savvas G. Chalkidis, Georgios C. Vougioukalakis

ABSTRACT The straightforward, one‐pot synthesis of 2‐arylthio‐2‐thiazolines is described. The facile preparation of these compounds is achieved through a propargylamine‐CS 2 cyclization step, followed by a subsequent copper‐catalyzed Chan‐Lam C─S cross coupling arylation reaction under O 2 atmosphere. Both reactions are conducted …

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Roadmap for light interaction with biophotonic surfaces and their diverse applications

Adam Władziński, Igor V. Meglinski, Alexander Bykov, Maria I. Gritsevich et autres

Significance: Biophotonics has advanced through many discoveries, yet challenges remain, including label-free biomolecular specificity, quantitative imaging, and single-molecule detection. Progress is further constrained by the need for cheaper, lighter, miniaturized materials that still meet strict optical, electrical, and mechanical specifications. This limitation …

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The Activation of the Precatalyst Au–Cl Bond in the Cycloisomerization of Propargylamides: The Role of Hydrogen Bonding

Leandros P. Zorba, Riku Saito, Sayan Dutta, Savvas G. Chalkidis et autres

Herein we describe our findings dealing with the activation of the Au–Cl bond in [Au(L)Cl] complexes with several additives. We have probed several additives for their ability to promote the activation of the Au–Cl bond, in a prototypical cationic Au(I)‐mediated reaction, namely …

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DABCO-Catalyzed Synthesis of Thiazolidine-2-thiones: System Development and Mechanistic Insights

Savvas G. Chalkidis, Sungil Hong, Anthi-Markella Tsiadi, Evangelia Fika et autres

High Resolution Image Download MS PowerPoint Slide A base-catalyzed protocol is reported for the construction of 1,3-thiazolidine-2-thione scaffolds bearing quaternary carbon centers from carbon disulfide and α-tertiary propargylamines. The reaction proceeds using low catalyst loading, under ambient temperatures, and in the absence …

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Nanoarchitectured N -Heterocyclic Carbene-Pt Nanoparticles on Carbon Nanotubes: Toward Advanced Electrocatalysis in the Hydrogen Evolution Reaction

Amalia Rapakousiou, Michail P. Minadakis, Savvas G. Chalkidis, M. Luisa Ruiz‐González et autres

High Resolution Image Download MS PowerPoint Slide In response to the need for sustainable energy, this study focuses on advancing the electrocatalytic Hydrogen Evolution Reaction (HER). Considering platinum-based catalysts’ efficacy, but acknowledging their cost and scarcity implications, our work pursues Pt content …

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NHC–Ni nanoclusters covalently ligated on carbon nanotubes: highly active electrocatalysts for the oxygen evolution reaction

Amalia Rapakousiou, Savvas G. Chalkidis, Michail P. Minadakis, Cristina Navío et autres

NHC–NiNCs covalently ligated on MWCNTs for highly efficient OER.

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A straightforward approach to robust thiazolylidene gold complexes: efficient catalysts for propargylamide cycloisomerizations

Savvas G. Chalkidis, Nikolaos Tsoureas, Steven P. Nolan, Georgios C. Vougioukalakis

The straightforward synthesis of new thiazolylidene gold complexes is described. Despite their decreased steric protection, these complexes demonstrate excellent stability and high catalytic activity in the HFIP-assisted cycloisomerization of propargylamides. The synthesis and catalytic activity of a novel, stable thiazolylidene gold alkoxide …

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KA2 Coupling, Catalyzed by Well‐Defined NHC‐Coordinated Copper(I): Straightforward and Efficient Construction of α‐Tertiary Propargylamines**

Savvas G. Chalkidis, Georgios C. Vougioukalakis

Abstract A new, straightforward, highly efficient, and mild catalytic protocol for the synthesis of α‐tertiary propargylamines, via the multicomponent KA2 reaction (Ketone‐Amine‐Alkyne), employing well‐defined, sustainable copper(I) complexes bearing N‐heterocyclic carbene ligands, is reported herein. The methodology uses very low catalyst loading under …

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Kevlar®, Nomex®, and VAR Modification by Small Organic Molecules Anchoring: Transfusing Antibacterial Properties and Improving Water Repellency

Efrosyni Frousiou, Efstathios Tonis, Georgios Rotas, Anna Pantelia et autres

The surface modification of fabrics composed of Kevlar®, Nomex®, or VAR was extensively investigated. Kevlar® and Nomex® are widely-utilized aramid materials, whereas VAR is a technical fabric comprising 64% viscose, 24% para-aramid (Kevlar®), 10% polyamide, and 2% antistatic fibers. Both aramid materials …

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CCDC 2175757: Experimental Crystal Structure Determination

Nikolaos V. Tzouras, Alberto Gobbo, Nestor Bracho Pozsoni, Savvas G. Chalkidis et autres

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …

Hydrogen bonding-enabled gold catalysis: ligand effects in gold-catalyzed cycloisomerizations in hexafluoroisopropanol (HFIP)

Nikolaos V. Tzouras, Alberto Gobbo, Nestor Bracho Pozsoni, Savvas G. Chalkidis et autres

Gold catalysis has witnessed immense evolution in recent years, yet it still requires the use of activators to render the common [AuCl(L)] complexes catalytically active. Herein, the H-bonding donor properties of hexafluoroisopropanol (HFIP) are utilized for Au-Cl bond activation and the ancillary …

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