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Showing 1 to 20 of 37 for “"NOESY"”.
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Isolation, Characterization, and Molecular Modeling Studies on Diterpenes From Marine Organisms Withing the Eunicea Genus
… To solve this problem, molecular modeling and NOESY were employed. Comparison of the NOESY interactions to the thermodynamically available conformations of several possible stereoisomers, calculated by molecular modeling, proved to be a useful technique. One of the remaining two structures was …
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Nuclear magnetic resonance studies of highly compressed fluids
… in 2-ethylhexyl benzoate were obtained by the NOESY method, which works well when the rate of molecular motion is very slow. Applying pressure to the model lubricant slowed down the molecular motion to the point where the NOESY experiment could be performed.
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Προσδιορισμός δομής, διαμορφωτικές ιδιότητες και ανακάλυψη πιθανών στόχων του παραγώγου του κινναμωμικού οξέος NGI25
… (DFT). Επιπλέον, εφαρμόστηκαν ομοπυρηνικά (COSY, NOESY) και ετεροπυρηνικά (HSQC, HMBC) πειράματα για τον προσδιορισμό των πρωτονίων και των ατόμων άνθρακα. Μετά την ταυτοποίηση της δομής, το NGI25 υποβλήθηκε σε υπολογιστικές μελέτες για να αποκαλυφθούν οι πιο ευνοϊκές διαμορφώσεις του. …
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High-pressure NMR studies of model membranes
… studied using two-dimensional phase sensitive NOESY as an indicator of cross-relaxation in the bilayer. Results indicated a dramatic buildup of cross-peak intensity with pressure. A qualitative explanation of the results, using a well-known model of cross-relaxation in the lipid bilayer, was …
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Re-evaluation of analytical chemistry techniques in studying DNA structures
… 4) Nuclear Overhauser Effect spectroscopy (NOESY) and correlation spectroscopy (COSY) were used to examine the conformational differences of 2’-deoxyadenosine when incubated in water. From the distance and torsion angle constraints obtained from NOESY and COSY respectively, and from existing …
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Naturstoffe aus Färbe- und Heilpflanzen
… Protonen der Aglyca wurde mittels ROESY- oder NOESY-Messungen ermittelt. Auch die interglycosidischen Verknüpfungen konnten sowohl aus den HMBC- als auch aus den NOESY-Spektren ermittelt werden. Aus Atriplex semibaccata konnten die 4 neuen Triterpensaponine isoliert werden. Aus Ononis vaginalis …
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Synthese, Stereochemie und pharmakologische Charakterisierung von 3,7-Diazabicyclo[3.3.1]nonan Derivaten als selektive kappa-Agonisten
… 63-65 umgesetzt. Mit Hilfe von selektiven 1D-NOESY-Messungen konnte die Stereochemie der Triole bezüglich der Stellung der Hydroxygruppe an C9 zugeordnet werden. Die 9-OH-BNDS 66-69 wurden durch Reduktion der entsprechenden 9-Oxo-BNDS HZ2, 3FLB, 32, 33 mit Na(CN)BH3 in MeOH synthetisiert. Die …
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ΔΙΕΡΕΥΝΗΣΗ ΤΗΣ ΔΙΠΛΩΣΗΣ ΤΟΥ ΠΕΠΤΙΔΙΚΟΥ ΣΚΕΛΕΤΟΥ. ΣΥΝΘΕΣΗ ΚΑΙ ΑΝΑΛΥΣΗ ΤΗΣ ΔΙΑΜΟΡΦΩΣΗΣ ΑΝΑΛΟΓΩΝ ΤΟΥ ΚΕΝΤΡΙΚΟΥ ΤΜΗΜΑΤΟΣ ΤΗΣ ΑΓΓΕΙΟΤΕΝΣΙΝΗΣ ΙΙ. ΦΑΣΜΑΤΟΣΚΟΠΙΕΣ UV-VIS ΚΑΙ NMR
… DIMENSIONAL NMR EXPERIMENTS (COSY, RELAYED COSY, NOESY).
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Antiproliferative Natural Products from the Madagascar Rainforest
… including COSY, HSQC/HMQC, HMBC, and ROESY/NOESY sequences, mass spectrometry, and chemical conversion. In addition, ten known compounds were obtained from five of the extracts. Studies on the remaining extracts were suspended due to various reasons. A multi-step synthesis of the …
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Optimization of Multidimensional Nuclear Magnetic Resonance Spectroscopy, for Resolution and Sensitivity, Through Application of Radial Sampling
… high resolution four-dimensional 13C, 15N edited NOESY is presented in support.
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Isolation and Structure Elucidation of Antiproliferative and Antiplasmodial Natural Products from Plants
… by using 1D (1H and 13C), 2D (HMBC, HSQC, COSY, NOESY) NMR spectroscopy and mass spectrometry. The structures of the compounds were also confirmed by comparing them with reported values from the literature. Compounds 2.1 and 2.2 showed moderate antiproliferative activity against the A2780 human …
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Linear, Branched and Crosslinked Polymers, Polyesters, Polyurethanes and Polymethacrylates Derived From Rotaxane Formation: Syntheses and Properties
… and nuclear Overhauser effect spectroscopy (NOESY) correlation. The threading efficiencies increased with lower polymerization temperature and increasing feed ratio of the cyclic vs. diol monomer. H-bonding between the crown ether and the OH groups of the diol monomers was identified as the …
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High-pressure NMR studies of model membranes and Kramers turnover on solution
… the bilayer vesicles has been determined by 2D NOESY experiments. In particular, $\sp{31}$P NMR experiments on multilamellar dispersions suggest that the TTC molecules are gradually expelled from the bilayers and completely excluded around 3 kbar, while $\sp1$H NMR experiments on sonicated …
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Isolation and Structure Elucidation of Anticancer and Antimalarial Natural Products
… including COSY, HASQC, HMQC, HMBC, and NOESY sequences, mass spectrometry, UV, IR, ECD, optical rotation, and chemical conversions. In addition, ten known compounds were isolated from another five of the extracts, while studies on the remaining extracts were suspended due to loss of …
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Probing regioselectivity in the Diels -Alder cycloadditions between *[60]fullerene and aryl substituted acenes
… and 2,3-dichloro-5,6-dicyanobenzoquinone. NOESY (nuclear Overhauser effect spectroscopy) methods are especially useful for the discrimination of 5,12 and 6,11 cycloaddition regioisomers of 15 and 41-45, as well as select Diels-Alder cycloaddition regioisomers of 22. The Diels-Alder …
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Exploring the Chemistry of Bis(azido)phosphine Chalcogenides and the Pursuit of Isolable Phosphinidene Chalcogenides
… 31P-31P nuclear Overhauser effect spectroscopy (NOESY). Thermogravimetric analysis (TGA) provided insights into the thermal stability of these compounds. Density functional theory (DFT) suggested that the observed chemoselectivity was a result of energetically inaccessible lowest unoccupied …
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Carbon-13 magic angle spinning NMR studies of myelin membranes
… utilizing two-dimensional cross-correlation (NOESY) experiments, is presented. Finally, structural elucidation of one component of a Chinese medicinal plant is presented, using several two-dimensional NMR techniques."
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Dibenzo-30-crown-10: Synthetic optimization and studies of the binding conformation
… rotaxanes were characterized by 1H, 13C and 2D-NOESY NMR, mp, and HRMS. A single crystal X-ray structure of one of the [2]rotaxanes was obtained. To our knowledge, this is the first crystal structure of a rotaxane based on this particular binding motif. This result illustrated that DB30C10 was a …
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Radical based molecular design of discrete and stereoregulated oligomers via photomediated RAFT single unit monomer insertion (photo-RAFT SUMI)
… characterized by NMR, ESI-MS, XRD and 2D NOESY to confirm their unique stereo-structures which were then correlated to their properties including thermal transition, crystallization, and optical activity.
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Polyaminocarboxylic Acids as Potential Candidates for Trivalent Actinide/lanthanide Separations
… polyaminocarboxylate complexes. Advanced 2D NOESY and classic 1D NMR spectroscopy were used to differentiate experimentally between cis- (C1 symmetry) and both trans- (C2 symmetry) isomers. IR spectroscopy was used to investigate the nature of carboxylate binding for metal complexes isolated …
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