A5089230793- Analytical Chemistry and Chromatography
- Liquid Crystal Research Advancements
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Molecular spectroscopy and chirality
- Mass Spectrometry Techniques and Applications
- Microfluidic and Capillary Electrophoresis Applications
- Chemical Synthesis and Analysis
- Photochromic and Fluorescence Chemistry
- Surfactants and Colloidal Systems
- Molecular Sensors and Ion Detection
- Plant Reproductive Biology
- Synthesis and Properties of Aromatic Compounds
- Supramolecular Chemistry and Complexes
- Crystallography and molecular interactions
- Chromatography in Natural Products
- Advanced Materials and Mechanics
- Forensic Toxicology and Drug Analysis
- Photochemistry and Electron Transfer Studies
- Click Chemistry and Applications
- Neuroscience and Neuropharmacology Research
- Various Chemistry Research Topics
- Axial and Atropisomeric Chirality Synthesis
- Political Economy and Marxism
- Plant-based Medicinal Research
University of Chemistry and Technology, Prague
2016-2025
California State University, San Bernardino
2008-2020
University of Vienna
2012-2015
Institute of Chemical Technology
2015
University of Tübingen
2014
Palacký University Olomouc
2014
California State University System
2008
Clark University
1999
Excited flavin facilitates stereoselective coupling of alcohols and acids to esters in the presence triphenylphosphine catalytic amount dialkyl hydrazinedicarboxylate.
Two series of new liquid crystalline lactic acid derivatives with a terminal ester group have been synthesised. The effect this unit and the length its alkyl chain on mesomorphic dielectric properties compounds exhibiting broad temperature range chiral smectic phases studied. We found that behaviour phase transition temperatures are strongly affected by molecular architecture. Depending in unit, studied materials exhibited paraelectric A*, ferroelectric tilted C* antiferroelectric CA* over...
Photoredox catalysis: A new way to induce triphenylphosphine be able mediate nucleophilic substitution reactions of alcohols and acids.
Mesomorphic properties of new bent-shaped liquid crystals based on 7-hydroxynaphthalene-2-carboxylic acid are presented. The central unit the molecular core was also modified by substitution chlorine atom or methyl group. Texture and calorimetric studies, as well electrooptical, X-ray dielectric measurements selected compounds were performed. For long homologues lamellar B2 phase observed, while for shorter two-dimensional columnar phases found, built layer fragments with electron density...
The recent popularity of indoor farming has brought about problems with parasites spreading among pollinator colonies. natural product callunene (1) can be used in the prophylaxis bumblebees against Crithidia infection. Here, we report synthesis (1), its enantioseparation, and a method for analyzing optical purity. approach was applied to determine configuration extracted from heather honey. proposed is also applicable analysis mixtures diastereomers obtained during synthesis, which allows...
The mercuration of calix[4]arene immobilized in the cone conformation allowed introduction an amino group at meta position basic skeleton. Acylation and subsequent intramolecular Bischler–Napieralski-type cyclization led to a novel type bridged calixarene containing seven-membered ring. These compounds with enlarged rigidified cavity represent unique inherently chiral system that may potentially be applicable for design receptors. absolute configuration one enantiomer, obtained by resolution...
The growing availability of new psychoactive substances with unknown toxicity is alarming all over the world. simplicity acquiring these drugs abuse from internet markets has caused an increase in total number seizures. We present first systematic spectroscopic study methylone and pentylone, which are class synthetic cathinones. High performance liquid chromatography (HPLC) was used for enantioseparation pentylone. were further analysed by conventional methods ultraviolet (UV) infrared (IR)...
Liquid crystals (LCs) are among the most prominent materials of current information age, mainly due to their well-known application in liquid crystal displays (LCDs). Their unique electro-optical properties stem from ability form organised structures (mesophases) on transition solid state isotropic liquid. Molecules LCs a mesophase still maintain anisotropy crystals, while simultaneously exhibiting fluidity liquids, which gives system react immediately external stimuli such as electric or...
In the continuation of our study role direction linking ester group and lateral substitution, we present three series bent-core liquid crystals based on 7-hydroxynaphthalene-2-carboxylic acid. The mesomorphic properties were investigated by polarised optical microscopy, differential scanning calorimetry, X-ray diffraction electro-optical methods. For non-substituted laterally methyl-substituted compounds, columnar phases broken-layer type a smectic A phase found. With increasing length...
Enantioseparation of chiral amines with HPLC has developed into a widely used analytical and preparative tool. Chiral basic molecules, which act as cationic species upon protonation, are suited for an enantioselective cation exchange process. Novel strong exchangers (SCX) based on different 3,5-disubstituted benzoic acids functionalized trans-(R,R)- trans-(S,S)-2-aminocyclohexanesulfonic acid the selector (SO) ion unit were synthesized. Employing 1,3-dipolar cycloaddition (azide-yne click...