Results 41 to 50 of about 19,944 (197)

Rotamers or Diastereomers? An Overlooked NMR Solution

, 2016
The existence of rotamers in a solution of analyte complicates 1H NMR analysis, especially when the presence of diastereomers is also possible. Organic chemists have often responded to this problem by conducting variable-temperature (VT) NMR experiments,
Peter Grice (2078575), Dennis X. Hu (1630801), Steven V. Ley (532034)   +2 more
core   +1 more source

Synthetic routes towards cryptophycin unit A diastereomers

, 2008
Eissler S, Neumann B, Stammler H-G, Sewald N. Synthetic routes towards cryptophycin unit A diastereomers. SYNLETT. 2008;2008(2):273-277.Unit A of cryptophycin 1 is a delta-hydroxy acid with four stereogenic centres.
Stammler, Hans-Georg, Neumann, Beate, Eissler, Stefan, Sewald, Norbert ; https://orcid.org/   +3 more
core   +1 more source

Force-Triggered Atropisomerization of a Parallel Diarylethene to Its Antiparallel Diastereomers

, 2023
This paper describes a mechanical approach to inducing the atropisomerization of a parallel diarylethene into its antiparallel diastereomers exhibiting distinct chemical reactivity.
Boyu Zhu (16504806), Xuancheng Fu (5129966), Xuancheng Fu, Xiaoran Hu, Xiaoran Hu (3046596), Boyu Zhu   +5 more
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Unified Total Synthesis of Pteriatoxins and Their Diastereomers [PDF]

Journal of the American Chemical Society, 2006
A unified total synthesis is reported to access all of the possible diastereomers of pteriatoxins A-C, with the use of an intramolecular Diels-Alder reaction as the key step to form the carbo-macrocyclic core structure. The C34/C35-diol protecting groups were found to have significant effects on both the exo/endo-selectivity and the exo-facial ...
Fumiyoshi, Matsuura, René, Peters, Masahiro, Anada, Scott S, Harried, Junliang, Hao, Yoshito, Kishi   +5 more
openaire   +2 more sources

Separation of peptide diastereomers using CEC and a hydrophobic monolithic column

, 2010
A neutral hydrophobic monolith prepared by radical in situ copolymerization of lauryl methacrylate and ethylene dimethacylate has been evaluated for the CEC separation of diastereomers of small peptides using acidic mobile phases containing ACN as ...
Ludewig, Ronny, Zou, Hanfa, Scriba, Gerhard K. E., 邹汉法, Dong, Jing   +4 more
core   +1 more source

Isolation of the 3′R and 3′S diastereomers of fasciculic acid C from the Australian mushroom Hypholoma australianum

, 2021
Nine compounds including the new diastereomers (3′R)-fasciculic acid C (1) and (3′S)-fasciculic acid C (2), the triterpenes (3–5), the sesquiterpenes (6–7) and the diketopiperazines (8–9) were isolated from the Australian mushroom Hypholoma australianum.
Cooper, O, Ward, BT, Tiralongo, E, Carroll, AR, Elnaas, AR, Tiralongo, J, Holland, DC, Grice, ID, Voser, TM, Abitbol, A, Zunk, M, Hayton, JB, May, TW   +12 more
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Stereoisomer-Independent Stable Blue Emission in Axial Chiral Difluorenol

Frontiers in Chemistry, 2021
Bulky conjugated molecules with high stability are the prerequisite for the overall improvement of performance in wide-bandgap semiconductors. Herein, a chiral difluorenol, 2,2′-(9,9′-spirobi[fluorene]-2,2′-diyl)bis(9-(4-(octyloxy)phenyl)-9H-fluoren-9-ol)
Mengna Yu, Xiong Jia, Dongqing Lin, Xue Du, Dong Jin, Ying Wei, Linghai Xie, Linghai Xie, Wei Huang, Wei Huang   +9 more
doaj   +1 more source

Separation of phosphorothioated oligonucleotide diastereomers using multiplexed drift tube ion mobility mass spectrometry.

, 2022
peer reviewedHydrophilic interaction liquid chromatography (HILIC) coupled to drift tube ion mobility spectrometry (DTIMS) was used to separate diastereomers of five-unit oligonucleotides containing 0, 1, 2 or 3 phosphorothioate (PS) linkages ...
Fjeldsted, John C, Nix, Cindy, Demelenne, Alice, Crommen, Jacques, Fillet, Marianne, Nys, Gwenael   +5 more
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Comparative Study on Separation of Diastereomers by HPLC.

, 2003
Reversed (RP-HPLC) and normal phase chromatographic (NP-HPLC) separations have been developed for diastereomers ofN-acyl-1-methyl-1,2,3,4-tetrahydo-β-carbolines which are acylated derivatives of simple natural β-carboline alkaloids. Separations
Milen, M., Hazai, L., Kettrup, A., Gebefügi, I., Poppe, L., Szantay, Cs., Fekete, J.   +6 more
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Synthesis of Novel Planar-Chiral Charge-Compensated nido-Carborane-Based Amino Acid

Molecules
Amino acids with unusual types of chirality and their derivatives have recently attracted attention as precursors in the synthesis of chiral catalysts and peptide analogues with unique properties.
Dmitry A. Gruzdev, Angelina A. Telegina, Marina A. Ezhikova, Mikhail I. Kodess, Galina L. Levit, Victor P. Krasnov   +5 more
doaj   +1 more source