Publications by authors named "Helmut Duddeck"

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Novel double functional protection of cephalostatin analogues using a gas-free chlorination method.
Mansour Nawasreh, Andreas Kirschning, Helmut Duddeck, Gerald Dräger, Dieter Fenske

Heliyon· January 2020

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Cis-diastereoselectivity in pictet-spengler reactions of L-tryptophan and electronic circular dichroism studies.
Naghmana Rashid, Samina Alam, Mashooda Hasan, Naeema Khan, Khalid M Khan, Helmut Duddeck

Chirality· October 2012

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Competition of ester, amide, ether, carbonate, alcohol and epoxide ligands in the dirhodium experiment (chiral discrimination by NMR spectroscopy).
Jens T Mattiza, Vera Meyer, Gülsüm Ozüduru, Tanja Heine, Joerg Fohrer, Helmut Duddeck

Nat Prod Commun· March 2012

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Flavonoids from Algerian endemic Centaurea microcarpa and their chemotaxonomical significance.
Souheila Louaar, Amel Achouri, Mostefa Lefahal, Hocine Laouer, Kamel Medjroubi, Helmut Duddeck

Nat Prod Commun· November 2011

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Optimizing dirhodium(II) tetrakiscarboxylates as chiral NMR auxiliaries.
Jens T Mattiza, Joerg G G Fohrer, Helmut Duddeck, Michael G Gardiner, Ashraf Ghanem

Org Biomol Chem· October 2011

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Adamantanes as spherical nanosondes in adducts with a chiral dirhodium complex-discriminating enantiomers and probing spatial proximities.
Helmut Duddeck, Gábor Tóth, Andras Simon, Edison Díaz Gómez, Jens T Mattiza

Magn Reson Chem· June 2011

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Experimental verification of diverging mechanisms in the binding of ether, thioether, and sulfone ligands to a dirhodium tetracarboxylate.
Jens T Mattiza, Vera J Meyer, Helmut Duddeck

Magn Reson Chem· March 2010

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Comparing various chiral dirhodium tetracarboxylates in the dirhodium method.
Jens T Mattiza, Nobuyuki Harada, Shunsuke Kuwahara, Zahid Hassan, Helmut Duddeck

Chirality· October 2009

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A new method proposed for the determination of absolute configurations of alpha-amino acids.
Edison Díaz Gómez, Helmut Duddeck

Magn Reson Chem· March 2009

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Chiral recognition of ethers by NMR spectroscopy.
Helmut Duddeck, Edison Díaz Gómez

Chirality· January 2009

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Atropisomeric 3-aryl-2-oxo-4-oxazolidinones and some thione analogues--enantiodifferentiation and ligand competition in applying the dirhodium method.
Edison Díaz Gómez, Ilknur Doğan, Müjde Yilmaz, Oznur Demir-Ordu, Dieter Albert, Helmut Duddeck

Chirality· March 2008

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Origin of 13C complexation shifts in the adduct formation of 2-butyl phenyl ethers with a dirhodium tetracarboxylate complex.
Edison Díaz Gómez, Helmut Duddeck

Magn Reson Chem· January 2008

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Benzaldehyde derivatives from Sarcodontia crocea.
Tetsuo Kokubun, Zbigniew Rozwadowski, Helmut Duddeck

J Nat Prod· September 2007

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Chemotypes in Achillea collina based on sesquiterpene lactone profile.
Milka Todorova, Antoaneta Trendafilova, Bozhanka Mikhova, Antonina Vitkova, Helmut Duddeck

Phytochemistry· July 2007

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Saturated amine oxides: Part 8. Hydroacridines: Part 27. Effects of N-oxidation and of N-quaternization on the 15N NMR chemical shifts of N-methylpiperidine-derived mono-, bi-, and tricycloaliphatic tertiary amines.
Francisc Potmischil, Helmut Duddeck, Alina Nicolescu, Calin Deleanu

Magn Reson Chem· March 2007

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Rh2[MTPA]4, a dirhodium complex as NMR auxiliary for chiral recognition.
Helmut Duddeck

Chem Rec· July 2006

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The dirhodium-method in the determination of absolute configurations of phospholene chalcogenides.
Stefan Moeller, Zbigniew Drzazga, Zbigniew Pakulski, K Michał Pietrusiewicz, Helmut Duddeck

Chirality· June 2006

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Sesquiterpene lactones from Achillea collina J. Becker ex Reichenb.
Antoaneta Trendafilova, Milka Todorova, Bozhanka Mikhova, Antonina Vitkova, Helmut Duddeck

Phytochemistry· April 2006

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Iridoid and lignan glycosides from Citharexylum spinosum L.
Barbara Balázs, Gábor Tóth, Helmut Duddeck, Hesham S M Soliman

Nat Prod Res· February 2006

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Glycosides from Bougainvillea glabra.
András Simon, Gábor Tóth, Helmut Duddeck, Hesham S M Soliman, Ibrahim I Mahmoud

Nat Prod Res· January 2006

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Complete 1H and 13C NMR spectral assignment of N-aralkylsulfonamides, N-sulfonyl-1,2,3,4-tetrahydroisoquinolines and N-sulfonyl-2,3,4,5-tetrahydro-1H-2-benzazepines. Conformational analysis of N-[((3',4'-dichlorophenyl)methyl)sulfonyl]-3-methyl-2,3,4,5-tetrahydro-1H-2-benzazepin.
Jorge L Jios, Gustavo P Romanelli, Juan Carlos Autino, Héctor E Giaccio, Helmut Duddeck

Magn Reson Chem· December 2005

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Effective enantiodifferentiation of spirochalcogenuranes by the dirhodium method: towards the determination of absolute configurations?
Tamás Gáti, Gábor Tóth, Józef Drabowicz, Stefan Moeller, Edgar Hofer, Helmut Duddeck

Chirality· September 2005

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Absolute configuration of C2-symmetric spiroselenurane: 3,3,3',3'-tetramethyl-1,1'-spirobi[3 H,2,1]benzoxaselenole.
Ana G Petrovic, Prasad L Polavarapu, Jozef Drabowicz, Yingru Zhang, Oliver J McConnell, Helmut Duddeck

Chemistry· July 2005

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Oxygenated bisabolane fucosides from Carthamus lanatus L.
Bozhanka Mikhova, Helmut Duddeck, Rilka Taskova, Maya Mitova, Kalina Alipieva

Z Naturforsch C J Biosci· September 2004

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Adducts of Rh2[MTPA]4 with some phosphine chalcogenides: nature of binding and ligand exchange.
Tamás Gáti, András Simon, Gábor Tóth, Damian Magiera, Stefan Moeller, Helmut Duddeck

Magn Reson Chem· July 2004

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