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205 results on '"Vogel, Emanuel"'

1. Three exposures to the spike protein of SARS-CoV-2 by either infection or vaccination elicit superior neutralizing immunity to all variants of concern

Author

Wratil, Paul R., Stern, Marcel, Priller, Alina, Willmann, Annika, Almanzar, Giovanni, Vogel, Emanuel, Feuerherd, Martin, Cheng, Cho-Chin, Yazici, Sarah, Christa, Catharina, Jeske, Samuel, Lupoli, Gaia, Vogt, Tim, Albanese, Manuel, Mejías-Pérez, Ernesto, Bauernfried, Stefan, Graf, Natalia, Mijocevic, Hrvoje, Vu, Martin, Tinnefeld, Kathrin, Wettengel, Jochen, Hoffmann, Dieter, Muenchhoff, Maximilian, Daechert, Christopher, Mairhofer, Helga, Krebs, Stefan, Fingerle, Volker, Graf, Alexander, Steininger, Philipp, Blum, Helmut, Hornung, Veit, Liebl, Bernhard, Überla, Klaus, Prelog, Martina, Knolle, Percy, Keppler, Oliver T., and Protzer, Ulrike

Published
2022
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2. Dynamics of spike-and nucleocapsid specific immunity during long-term follow-up and vaccination of SARS-CoV-2 convalescents

Author

Koerber, Nina, Priller, Alina, Yazici, Sarah, Bauer, Tanja, Cheng, Cho-Chin, Mijočević, Hrvoje, Wintersteller, Hannah, Jeske, Samuel, Vogel, Emanuel, Feuerherd, Martin, Tinnefeld, Kathrin, Winter, Christof, Ruland, Jürgen, Gerhard, Markus, Haller, Bernhard, Christa, Catharina, Zelger, Otto, Roggendorf, Hedwig, Halle, Martin, Erber, Johanna, Lingor, Paul, Keppler, Oliver, Zehn, Dietmar, Protzer, Ulrike, and Knolle, Percy A.

Published
2022
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3. MCD of Non-aromatic Cyclic π-Electron Systems. Part 6: Pentalenes and Heptalenes

Author

Fleischhauer, Jörg, Raabe, Gerhard, Klingensmith, Kenneth A., Höweler, Udo, Chatterjee, Prabir K., Hafner, Klaus, Vogel, Emanuel, and Michl, Josef

Abstract

The magnetic circular dichroism (MCD) spectra of several stable derivatives of pentalene (1) and heptalene (2) have been recorded. The lowest energy transition (from the ground to the S state in perimeter model nomenclature) is extremely weak in MCD and in absorption. The sign patterns of the B terms for the first three strong transitions—N₁, N₂, P₁—in the order of increasing energy, are −−+ for 1 and ++− for 2. These findings are in perfect agreement with numerical results obtained at the SACCI level and with expectations based on the perimeter model of Parts 1–4 of this series, both of which lead to the conclusion that the magnetic mixing of the S excited state with the ground state is dominant. This is an extremely rare situation for an organic molecule, in which B term signs are normally determined by the mutual magnetic mixing of excited states. It can be expected to occur in other conjugated systems derived from 4N-electron perimeters that have a low-energy first excitation, which is of intrashell nature in the perimeter model and therefore is magnetic-dipole allowed. In contrast, all low-energy transitions in the much more common systems derived from (4N + 2)-electron perimeters are of intershell nature and are magnetic-dipole forbidden.

Published
2022

6. Excited states of bridged [14]annulenes

Author

Moroni, Laura, Gellini, Cristina, Salvi, Pier Remigio, and Vogel, Emanuel

Subjects
Ylides -- Properties, Ethanes -- Atomic properties, Excited state chemistry -- Research, Chemicals, plastics and rubber industries
Abstract

Fluorescence and Raman spectra of two representative bridged [14]annulenes, namely 1,6:8,13-ethanediylidene[14]-annulene and 1,6:8,13-propanediylidene[14]annulene are measured. The Raman spectra are measured using several excitation wavelengths in pre- and/or near-resonance conditions with respect to the L(sub a) and B(sub a) states.

Published
2004

7. Vibrational spectra and density functional calculations of bridged [14]annulenes with an anthracene perimeter

Author

Moroni, Laura, Gellini, Cristina, Salvi, Pier Remigio, Chung-Jing Liu, and Vogel, Emanuel

Subjects
Chemistry, Physical and theoretical -- Research, Raman spectroscopy -- Usage, Vibrational spectra -- Analysis, Chemicals, plastics and rubber industries
Abstract

Vibrational spectra of bridged [14]annulenes with an anthracene perimeter are presented and discussed on the basis of density functional calculations with the B3LYP functional and 6-31G** and cc-pVDZ, basis sets. The Raman spectra are obtained exciting at 647.1 and 1064 nm, that is, in pre- and off-resonance excitation conditions, respectively.

Published
2002

8. Synthesis of persialylated beta-cyclodextrins

Author

Roy, Rene, Hernandez-Mateo, Fernando, Sactoyo-Gonzalez, Francisco, Lex, Johann, Schmickler, Hans, and Vogel, Emanuel

Subjects
Cyclodextrins -- Research, Cyclodextrins -- Properties, Biological sciences, Chemistry
Abstract

Synthesis of homogeneous hepta-antennated C-6 branched sialosyl cyclomaltoheptose derivatives were performed in good yields and the compounds were fully characterized. The preparation of such multivalent sialosidea with potential biorecognizable properties contributes to expand the existing array of such glycoforms.

Published
2000

9. Enantioselective synthesis of fluorinated analogues of the orsellinic acid-type twelve-membered lactone lasiodiplodin

Author

Runge, Martina, Haufe, Gunter, Roush, William R., Lex, Johann, Schmickler, Hans, and Vogel, Emanuel

Subjects
Enantiomers -- Research, Cyclooxygenases -- Research, Cyclooxygenases -- Structure, Biological sciences, Chemistry
Abstract

The chemoenzymatic synthesis of the racemate and the one enantiomer of the fluorinated analogue of the natural cyclooxygenase inhibitor lasiodiplodin is described. The formation of the 12-membered lactone by a ring-closing metathesis is the key step in this synthesis.

Published
2000

10. Synthesis of the C(29)-C(45) bis-pyran subunit (E-F) of spongistatin 1 (altohyrtin A)

Author

Micalizio, Glenn C., Pinchuk, Anatoly N., Roush, William R., Lex, Johann, Schmickler, Hans, and Vogel, Emanuel

Subjects
Methyl groups -- Chemical properties, Statins -- Research, Biological sciences, Chemistry
Abstract

A synthesis of the C(29)-C(45) bis-pyran subunit of spongistatin 1 is described. The C(29)-c(45) bis-pyran subunit can be assembled through an aldol reaction between a suitably functionalized F-ring methly ketone and 2,3-syn aldehyde.

Published
2000

11. P-Nitrosophosphate compounds: New N-O heterodienophiles and nitroxyl delivery agents

Author

Ware, Roy W. Jr., King, S. Bruce, Velu, Sadanandan E., Lex, Johann, Schmickler, Hans, and Vogel, Emanuel

Subjects
Nitric oxide -- Research, Electrons -- Usage, Phosphates -- Research, Phosphates -- Chemical properties, Biological sciences, Chemistry
Abstract

P-nitrosophosphates represent new asymmetric N-O heterodienophiles that react with 1,3-dienes to produce complex oxygen-, nitrogen-, and phosphorous- containing cycloadducts and permit the direct introduction of the phosphoramidate functional group. P-nitrosophosphates also reacts with water to yield nitoxyl, the biologically important one-electron-reduced form of nitric oxide.

Published
2000

12. Conjugate addition reactions of alpha-aminoalkylcuprates with alpha, beta-alkenyl, alpha,beta-alkynyl, alpha, beta-beta,gamma-allenyl, and alpha,beta-gamma,sigma-dienyl carboxylic acid derivatives, nitriles, and sulfoxides

Author

Dieter, R. Karl, Lu, Kai, Velu, Sadanandan E., Lex, Johann, Schmickler, Hans, and Vogel, Emanuel

Subjects
Amino acids -- Usage, Carboxylic acids -- Research, Carboxylic acids -- Atomic properties, Biological sciences, Chemistry
Abstract

Reaction conditions are developed for the conjugate addition of alpha-nitrogen heteroatom functionalized cuprate reagents with the less reactive carboxylic acid derivatives. The conjugate addition reactions of alpha-aminoalkylcuprates to alpha,beta-unsaturated carboxylic acid derivatives proceeds eventually when used with CuCN.2LiCl.

Published
2000

13. Competitive formation of helical cycloocta- and cyclododecapyrroles

Author

Wytko, Jennifer A., Michels, Martin, Zander, Lars, Lex, Johann, Schmickler, Hans, and Vogel, Emanuel

Subjects
Methyl groups -- Research, Methyl groups -- Structure, Pyrrole -- Usage, Biosynthesis -- Usage, Biological sciences, Chemistry
Abstract

The synthesis, characterization and dynamic nature of gem-dimethyl-functionalized cyclooctapyrrole and cyclododecapyrrole are presented. Formation of the larger cyclododecapyrrole is a result of the gem-dimethyl effect.

Published
2000

15. Heterologous prime–boost vaccination with ChAdOx1 nCoV-19 and BNT162b2

Author

Roggendorf, Hedwig, Zelger, Otto, Christa, Catharina, Jeske, Samuel, Heringer, Sarah, Alsalameh, Rayya, Esse, Jan, Mattner, Jochen, Wytopil, Monika, Tenbusch, Matthias, Schumacher, Sofie, Vogel, Emanuel, Priller, Alina, Held, Jürgen, Steininger, Philipp, Beileke, Stephanie, Irrgang, Pascal, Brockhoff, Ronja, Salmanton-García, Jon, Tinnefeld, Kathrin, Mijocevic, Hrvoje, Schober, Kilian, Bogdan, Christian, Yazici, Sarah, Knolle, Percy, Cornely, Oliver A, Überla, Klaus, and Protzer, Ulrike

Published
2021
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18. Magnetic circular dichroism of octaethylcorrphycene and its doubly protonated and deprotonated forms

Author

Gorski, Alexander, Vogel, Emanuel, Sessler, Jonathan L., and Waluk, Jacek

Subjects
Ligands -- Analysis, Copper compounds -- Research, Copper compounds -- Magnetic properties, Chemicals, plastics and rubber industries
Abstract

The nature of magnetic orbitals is analyzed on a series of five Cu(d (sub 9)...Cu(d (sub 9) complexes, comparing various theoretical approaches. The DFT magnetic orbitals appear to strongly overestimate the metal-ligand delocalization.

Published
2002

19. Corroles with group 15 ions. 2. synthesis and characterization of octaethylcorroles containing a phosphorus central atom

Author

Kadish, Karl M., Zhongping Ou, Adamian, Victor A., Guilard, Roger, Gros, Claude P., Erben, Christoph, Will, Stefan, and Vogel, Emanuel

Subjects
Chemical synthesis -- Observations, Phosphorus compounds -- Chemical properties, Chemistry
Abstract

A report is presented which states the synthesis spectroscopic characterization and electro chemistry of five new phosphorus corroles. The investigated complexes contained alkyl,aryl,oxo, or hydrido axial ligands and were represented as (OEC)P(H)(sub 2),(OEC)P(CH(sub 3))(sub 2), (OEC)P(C(sub 6)H(sub 5))(sub 2),(OEC)P=O is the trianion of octaethylcorrole.

Published
2000

23. MCD of non‐aromatic cyclic π‐electron systems. Part 6: Pentalenes and heptalenes.

Author

Fleischhauer, Jörg, Raabe, Gerhard, Klingensmith, Kenneth A., Höweler, Udo, Chatterjee, Prabir K., Hafner, Klaus, Vogel, Emanuel, and Michl, Josef

Subjects
SPECTRUM analysis, QUANTUM theory, QUANTUM chemistry, PARTICLES (Nuclear physics)
Abstract

The magnetic circular dichroism (MCD) spectra of several stable derivatives of pentalene (1) and heptalene (2) have been recorded. The lowest energy transition (from the ground to the S state in perimeter model nomenclature) is extremely weak in MCD and in absorption. The sign patterns of the B terms for the first three strong transitions—N1, N2, P1—in the order of increasing energy, are −−+ for 1 and ++− for 2. These findings are in perfect agreement with numerical results obtained at the SACCI level and with expectations based on the perimeter model of Parts 1–4 of this series, both of which lead to the conclusion that the magnetic mixing of the S excited state with the ground state is dominant. This is an extremely rare situation for an organic molecule, in which B term signs are normally determined by the mutual magnetic mixing of excited states. It can be expected to occur in other conjugated systems derived from 4N‐electron perimeters that have a low‐energy first excitation, which is of intrashell nature in the perimeter model and therefore is magnetic‐dipole allowed. In contrast, all low‐energy transitions in the much more common systems derived from (4N + 2)‐electron perimeters are of intershell nature and are magnetic‐dipole forbidden. © 2005 Wiley Periodicals, Inc. Int J Quantum Chem, 2005 [ABSTRACT FROM AUTHOR]

Published
2005
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