نتایج جستجو برای: dynamic 1h nmr

تعداد نتایج: 482449  

Journal: :Organic & biomolecular chemistry 2005
Sylvia Schmid Martin Röttgen Ulf Thewalt Volkhard Austel

The synthesis of 2,6-bis-anilino-3-nitropyridines that are alkylated or acylated at the anilino nitrogen atoms is described. These derivatives show characteristic differences in the 1H-NMR spectra compared with the unsubstituted parent compound. These differences are used to determine structure-conformation relationships of this type of compounds. The conclusions drawn from the 1H-NMR spectra i...

Farhad Hatamjafari

An efficient protocol for the synthesis of 3,4-dihydropyrimidin-2-(1H)-one/thione derivatives via multi-component coupling reaction of aromatic aldehydes, β-ketoester and urea or thiourea under solvent-free conditions using Silica Supported Barium Chloride as a catalyst is described. All prepared compounds with melting points, IR,1H NMR and 13C NMR were identified. High yields, mild conditi...

P. Samadhiya

A new series of N-[2-(1H-1,2,3-benzotriazol-1-yl)ethyl]-4-(substitutedphenyl)-3-chloro-2-oxo-1-iminoazetidine, compounds 4(a-j) were synthesized. The structures of all the synthesized compounds were confirmed by chemical and spectral analyses such as IR, 1H NMR, 13C NMR and FAB-Mass. The compounds 4(a-j) were screened for their antibacterial, antifungal and antitubercular activities and gave ac...

2015
ALI AMINKHANI

Synthesis of the Guanidium-Meldrum acid zwitterionic salts was developed through a three component reaction of 2, 2-dimethyl-1, 3-dioxane-4, 6-dione (Meldrum acid), aromatic aldehydes and N, N, N’, N’-Tetramethyl-guanidine in benzen at room temperature. These reaction conditions allow the preparation of stable zwitterionic salts in good yields. A dynamic NMR effect is observed as a result of re...

Journal: :Molecules 2018
Eglė Arbačiauskienė Sonata Krikštolaitytė Aiva Mitrulevičienė Aurimas Bieliauskas Vytas Martynaitis Matthias Bechmann Alexander Roller Algirdas Šačkus Wolfgang Holzer

The tautomerism of 1-phenyl-1,2-dihydro-3H-pyrazol-3-One was investigated. An X-ray crystal structure analysis exhibits dimers of 1-phenyl-1H-pyrazol-3-ol units. Comparison of NMR (nuclear magnetic resonance) spectra in liquid state (¹H, 13C, 15N) with those of "fixed" derivatives, as well as with the corresponding solid state NMR spectra reveal this compound to exist predominantly as 1H-pyrazo...

Journal: :Revista Colombiana de Ciencias Químico - Farmacéuticas 2022

Introduction: Cannabidiol (CBD) has become a promising bioactive for the next decades after recent recognition of medical potential Cannabis derivatives by United Nations member countries, as it no psychotropic your isomer ∆9-tetrahydrocannabinol (∆9-THC). The differentiation these isomers been studied decades. Recent studies demonstrate that even with more subtle chemical characteristics, such...

Journal: :The Journal of chemical physics 2006
M Carravetta O G Johannessen M H Levitt I Heinmaa R Stern A Samoson A J Horsewill Y Murata K Komatsu

We have observed 1H NMR spectra of hydrogen molecules trapped inside modified fullerene cages under cryogenic conditions. Experiments on static samples were performed at sample temperatures down to 4.3 K, while magic-angle-spinning (MAS) experiments were performed at temperatures down to 20 K at spinning frequencies of 15 kHz. Both types of NMR spectra show a large increase in the intramolecula...

2014
Thomas Cruz Stéphane Balayssac Véronique Gilard Robert Martino Christian Vincent Jérémie Pariente Myriam Malet-Martino

Two publications from the same research group reporting on the detection of new possible biomarkers for the early diagnosis of Alzheimer's disease (AD), based on the analysis of cerebrospinal fluid samples (CSF) with 1H Nuclear Magnetic Resonance (NMR), are at the origin of the present study. The authors observed significant differences in 1H NMR spectra of CSF from AD patients and healthy cont...

Journal: :Dalton transactions 2006
Jakub Rudovský Mauro Botta Petr Hermann Avtandil Koridze Silvio Aime

A novel "ditopic" ligand containing two monophosphinate triacetate DOTA-like units linked by a thiourea bridge has been synthesized and its complexes with Ln3+ ions (Ln = Y, Eu, Gd, Dy) investigated by NMR spectroscopy and relaxometry. The presence of one water molecule in the first coordination sphere has been determined by the measurement of the dysprosium(III)-induced 17O NMR shifts. The 1H ...

Journal: : 2021

Bu makalede, 4-metil-2,3-difenil-2,3-dihidro-1H-pirazol ve 4-(4-metil-5-fenil-2,5-dihidro-1H-pirazol-1-il)benzensulfonamid türevi bileşikler α,β-doymamış aldehit bileşiklerinin fenilhidrazin hidrat veya 4-sülfamoil fenil hidrazin hidrojen klorür ile tepkimelerinden elde edildi. reaksiyonların takibinde bileşiklerin aromatlaştırma tepkimeleri 2,3-dikloro-5,6-disiyano-1,4-benzokinon (DDQ) yapıldı...

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