Results 11 to 20 of about 17,928 (220)

First Trifluoromethylated Phenanthrolinediamides: Synthesis, Structure, Stereodynamics and Complexation with Ln(III)

Molecules, 2022
The first examples of 1,10-phenanthroline-2,9-diamides bearing CF3-groups on the side amide substituents were synthesized. Due to stereoisomerism and amide rotation, such complexes have complicated behavior in solutions. Using advanced NMR techniques and
Yuri A. Ustynyuk, Pavel S. Lemport, Vitaly A. Roznyatovsky, Konstantin A. Lyssenko, Alexey O. Gudovannyy, Petr I. Matveev, Ennie K. Khult, Mariia V. Evsiunina, Vladimir G. Petrov, Igor P. Gloriozov, Anton S. Pozdeev, Valentine S. Petrov, Nane A. Avagyan, Alexander S. Aldoshin, Stepan N. Kalmykov, Valentine G. Nenajdenko   +15 more
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Stereoselectivity in spontaneous assembly of rolled incommensurate carbon bilayers

Nature Communications, 2021
Incommensurate pairing is a type of stereoisomerism, observed in carbon bilayers, that arises from the twisted orientations of the graphitic layers. Here, the authors create a finite molecular version of an incommensurate carbon bilayer in the form of ...
Taisuke Matsuno, Yutaro Ohtomo, Maki Someya, Hiroyuki Isobe   +3 more
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Development of an open-source software for isomer enumeration

Journal of Cheminformatics, 2023
This article documents enu, a freely-downloadable, open-source and stand-alone program written in C++ for the enumeration of the constitutional isomers and stereoisomers of a molecular formula.
Salomé R. Rieder, Marina P. Oliveira, Sereina Riniker, Philippe H. Hünenberger   +3 more
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Early contributions of crystallography to the atomic theory of matter

Substantia, 2019
After briefly presenting early hypotheses on the submicroscopic origin of symmetry and polyhedral morphology in the crystals, the structural model proposed by Haüy in 1784, based on the periodic repetition of integrant molecules made up of simple ...
Giovanni Ferraris
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Pyrethroid Stereoisomerism: Diastereomeric and Enantiomeric Selectivity in Environmental Matrices – A Review

Orbital: The Electronic Journal of Chemistry, 2018
Pyrethroids are chiral insecticides characterized by stereoisomerism, which occurs due to the presence of one to three asymmetric (chiral) carbons, generating one or two pairs of cis/trans diastereomers, and two or four pairs of enantiomers ...
Cláudio Ernesto Taveira Parente, Claudio Eduardo Azevedo-Silva, Rodrigo Ornellas Meire, Olaf Malm   +3 more
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Stereoisomerism and Conformational Directionality (Prelog Lecture)

CHIMIA, 1986
The inaugural Prelog Lecture provides me with a unique opportunity to pay tribute to a great scientist, teacher, and friend. As I hope to show, the work of Vladimir Prelog is profoundly relevant to the work that I want to describe today.
Kurt Mislow
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Stereoselective formation of bismuth complexes by transmetalation of lead with adaptable overhanging carboxylic acid 5,10-strapped porphyrins

Comptes Rendus. Chimie, 2021
Out-of-plane deformations of metalloporphyrin skeletons have been well documented as playing important roles in relevant biological processes. In contrast, out-of-plane binding to the N-core of large metal cations as period 6 post-transition elements has
Barakat, Wael, Hijazi, Ismail, Roisnel, Thierry, Dorcet, Vincent, Le Gac, Stéphane, Boitrel, Bernard   +5 more
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The role of stereochemistry of antibiotic agents in the development of antibiotic resistance in the environment

Environment International, 2020
Antibiotic resistance (ABR) is now recognised as a serious global health and economic threat that is most efficiently managed via a ‘one health’ approach incorporating environmental risk assessment.
Felicity C.T. Elder, Edward J. Feil, JasoN. Snape, William H. Gaze, BarbarA. Kasprzyk-Hordern   +4 more
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Hepatic Organoid-Based High-Content Imaging Boosts Evaluation of Stereoisomerism-Dependent Hepatotoxicity of Stilbenes in Herbal Medicines

Frontiers in Pharmacology, 2022
The complexity of chemical components of herbal medicines often causes great barriers to toxicity research. In our previous study, we have found the critical divergent hepatotoxic potential of a pair of stilbene isomers in a famous traditional Chinese ...
Juan Liu, Tingting Li, Ruihong Li, Jie Wang, Pengyan Li, Ming Niu, Le Zhang, Chunyu Li, Tao Wang, Xiaohe Xiao, Jia-bo Wang, Jia-bo Wang, Yunfang Wang   +12 more
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Analysis of cis-isomer-enriched dihydroquercetin sample by 1D and 2D NMR spectroscopy

Разработка и регистрация лекарственных средств
Introduction. The structure of dihydroquercetin (DHQ) is characterized by two chiral centers at positions 2 and 3 of the benzopyran cycle, resulting in possible diastereomers: trans- and cis-isomers.
R. P. Terekhov, A. Taldaev, E. V. Bocharov, D. I. Pankov, A. D. Savina, I. A. Selivanova   +5 more
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