Results 61 to 70 of about 177,307 (324)

Botrylactone: new interest in an old moleculedreview of its absolute configuration and related compounds [PDF]

, 2010
The absolute configuration of botrylactone, a unique compound with an interesting polyketide lactone skeleton with two oxirane bridges previously isolated from Botrytis cinerea and described as a powerful antibiotic, has been reviewed on the basis of ...
Durán Patrón, Rosa María, González Collado, Isidro, Hernández Galán, Rosario, Moraga Galindo, Javier, Pinedo Rivilla, Cristina   +4 more
core   +2 more sources

Biogenic Next‐Gen CPL Emitters: Strategies with Proteins, Polysaccharides, and Nucleotides

Advanced Optical Materials, EarlyView.
Biogenic molecules such as proteins, peptides, saccharides, and DNA can act as natural scaffolds for generating circularly polarized luminescence (CPL). This review highlights recent strategies exploiting these inherently chiral frameworks to achieve light emission with controllable handedness under unpolarized excitation, bridging biological ...
Ricardo Chavez‐Jimenez, Gustavo González‐Gaitano, Julio Fernandez‐Cestau, Mattia Nieddu, Juan Pablo Fuenzalida‐Werner   +4 more
wiley   +1 more source

Stereochemistry of Chiral 2-Substituted Chromanes: Twist of the Dihydropyran Ring and Specific Optical Rotation

Molecules, 2023
Chiral 2-substituted chromanes are important substructures in organic synthesis and appear in numerous natural products. Herein, the correlation between specific optical rotations (SORs) and the stereochemistry at C2 of chiral 2-substituted chromanes was
Bei-Bei Yang, Fan Gao, Ya-Dong Yang, Ru Wang, Xin Li, Li Li   +5 more
doaj   +1 more source

Hierarchical Twist: Chirality Across Scales in Cellulose Cholesterics

Advanced Optical Materials, EarlyView.
Hierarchical left‐ and right‐handed chiral nematic structures are observed in a solvent‐free thermotropic cellulose derivative. Free‐standing films show hierarchical twisted structures whose pitches respond differently to uniaxial strain: left‐handed pitches increase, ones decrease.
N. Monge, L.F.V. Pinto, E. Ferreira, P.L. Almeida, J.L. Figueirinhas, A.L. Carvalho, P.J. Sebastião, M.H. Godinho   +7 more
wiley   +1 more source

The Role of Intimate Dipole Carbonyl–Carbonyl and Hydrogen–Carbonyl Interactions in the Stereocomplexation and Crystallization: The Case of Poly(Cyclohexene Carbonate)

Angewandte Chemie, EarlyView.
Isotactic poly(cyclohexene carbonate) crystalizes both as enantiopure polymer and upon stereocomplexation of the two opposite enantiomers. Both structures are characterized by multiple H‐‐‐O═C tight attractive interactions, whereas in the stereocomplex a tight interdigitation of the two enantiomeric chains occurs due to additional intimate dipole ...
Massimo Christian D'Alterio, Miriam Scoti, Rocco Di Girolamo, Giovanni Talarico, Geoffrey W. Coates, Claudio De Rosa   +5 more
wiley   +2 more sources

Unambiguous Stereochemical Assignment of Cyclo(Phe-Pro), Cyclo(Leu-Pro), and Cyclo(Val-Pro) by Electronic Circular Dichroic Spectroscopy

Molecules, 2021
2,5-diketopiperazines (DKPs) are cyclic dipeptides ubiquitously found in nature. In particular, cyclo(Phe-Pro), cyclo(Leu-Pro), and cyclo(Val-Pro) are frequently detected in many microbial cultures.
Alison Domzalski, Liliana Margent, Valeria Vigo, Faizunnahar Dewan, Naga Vara Kishore Pilarsetty, Yujia Xu, Akira Kawamura   +6 more
doaj   +1 more source

Lancifodilactone G : insights about an unusually stable enol [PDF]

, 2008
From quantum mechanics calculations we confirm that the naturally occurring enol lancifodilactone G is stable over the keto form (by 2.6 kcal/mol in water), the only known stable aliphatic enol (devoid of conjugated or bulky aromatics and lacking a 1,3 ...
Chenoweth, D. M., Chenoweth, K., Goddard, W. A., III   +2 more
core   +1 more source

Visible‐Light Photocatalyzed Selective Synthesis of 1,2‐ or 1,3‐Dithianes From Thietanes: An Experimental and Theoretical Study

Advanced Synthesis &Catalysis, EarlyView.
Although this article formally presents a regioselective photochemical ring enlargement of thietanes into 1,2‐ or 1,3‐dithianes, time‐dependent density functional theory calculations have revealed that 1,3‐dithianes are in fact formed thought photoinduced hydrogen atom transfers from 1,2‐dithianes initially resulting from the ring enlargement using ...
Gabriel Cormier, Manuel Pedrón, Maria I. Lapuh, Regis Guillot, Ilaria Ciofini, Thomas Boddaert   +5 more
wiley   +1 more source

Bright Circularly Polarized Electrochemiluminescence from Heterobinuclear IrIII–AuI Enantiomers

Angewandte Chemie, EarlyView.
Efficient and bright circularly polarized electrochemiluminescence (CP‐ECL) is achieved in a class of enantiopure hetobinuclear iridium(III)–gold(I) complexes owing to the combination of high ECL efficiency with stability, good emission dissymmetry factor and high brightness, thus paving the way to the next‐generation of bright CP‐ECL probes.
Lavinia Ballerini, Miaoxia Liu, Lorenzo Arrico, Silvia Voci, Christophe Gourlaouen, Chantal Daniel, Vincent César, Stéphane Bellemin‐Laponnaz, Francesco Zinna, Laurent Bouffier, Federico Polo, Lorenzo Di Bari, Neso Sojic, Matteo Mauro   +13 more
wiley   +2 more sources

General Anesthetics: Aspects of Chirality, Pharmacodynamics, and Pharmacokinetics

Pharmaceuticals
The introduction of general anesthetics in the mid-19th century is considered one of the greatest contributions to medical practice. It was the first time that complicated surgical interventions became feasible, without putting an excessive strain on the
Ružena Čižmáriková, Ladislav Habala, Jindra Valentová   +2 more
doaj   +1 more source