Results 61 to 70 of about 4,909 (228)

A DFT Study on the Mechanism of Selective Formation of Substituted Azepines From 1‐Azabutadienes and Cyclopropanes

Chemistry – A European Journal, EarlyView.
The origin of the unusual regioselectivity in the Mg‐catalyzed cyclization of azadiene‐type imines with cyclopropanes is elucidated by DFT calculations. Although five‐membered rings are typically favored, energy decomposition analysis reveals that severe steric congestion induces a highly distorted transition state, rendering the five‐membered pathway ...
Ryo Kobayashi, Chao Wang, Shuto Kosuge, Yuji Matsuya, Kenji Sugimoto, Keiichi Hirano   +5 more
wiley   +1 more source

Flipping the Card With Enantiodivergent Organocatalysis

Chemistry – A European Journal, EarlyView.
This minireview elaborates on recent organocatalytic strategies for achieving enantiodivergence—the ability to access both product enantiomers using a single chiral catalyst. It highlights how achiral stimuli, such as solvent polarity and chemical additives, along with minimal catalyst modifications, trigger stereochemical inversions in reactions ...
Debora Iapadre, Alessio Carioscia, Alessandro Brusa, Armando Carlone   +3 more
wiley   +1 more source

Organocatalytic Formal (3+2+1)‐Cycloaddition of Allenoates, Michael Acceptors, and Carbaldehydes

Chemistry – A European Journal, EarlyView.
The use of secondary amine Lewis base organocatalysts allows for the unprecedented activation of allenoates for formal (3+2+1)‐cycloadditions with Michael acceptors and aromatic carbaldehydes. ABSTRACT Employing secondary amines as covalently interacting Lewis basic organocatalysts allows for the activation of electron‐deficient allenes (allenoates ...
David Naderer, Alexander Pötscher, Katharina Eder, Uwe Monkowius, Markus Himmelsbach, Mario Waser   +5 more
wiley   +1 more source

Design and Synthesis of Polyheterocyclic Compounds Containing Pyrazolopyridopyrimidine Nucleus with Antimicrobial Activities

ChemistryOpen
This study reports the design, synthesis, and antibacterial evaluation of a library of novel polyheterocyclic derivatives featuring a unique fused pyrimidopyridopyrazole moiety.
Farag A. El‐Essawy, Mohammad Ahmad Ahmad Odah   +1 more
doaj   +1 more source

Structure-Based Rationale for Selectivity in the Asymmetric Allylic Alkylation of Cycloalkenyl Esters Employing the Trost ‘Standard Ligand’ (TSL): Isolation, Analysis and Alkylation of the Monomeric form of the Cationic η3-Cyclohexenyl Complex [(η3-c-C6H9)Pd(TSL)]+ [PDF]

, 2009
The solution-phase structures of the monomeric forms of the cationic Pd-η3-allyl and Pd-η3-cyclohexenyl complexes [Pd(R,R)-1(η3-C3H5)]+ (7+) and [Pd(R,R)-1(η3-C6H9)]+ (8+) bearing the trans-cyclohexylenediamine-based Trost ‘Standard Ligand’ (R,R)-1 have ...
Albinati A., Alcock N. W., Allinger N. L., Allinger N. L., Amatore C., Amatore C., Amatore C., Auburn P. R., Becke A. D., Berrisford D. J., Boog-Wick K., Breutel C., Brookhart M., Burger S., Butts C. P., Correia J. D. G., Dominguez B., Dunina V. V., Evans D. A., Evans L. A., Fairlamb I. J. S., Fairlamb I. J. S., Filali E., Frank M., Fristrup P., Fristrup P., Gais H. J., Gais H.-J., Gogoll A., Gogoll A., Goodman J. M., Gundertofte K., Hagelin H., Hagelin H., Hansson S., Hay P. J., Hayashi T., Hayashi T., Hoots J. E., Imaizumi S., Johansson M. J., Kolossvary I., Kudis S., Lee C., Lloyd-Jones G. C., Lloyd-Jones G. C., Lloyd-Jones G. C., Lu Z., Lüssem B. J., Mackenzie P. B., Madec M., Malet R., Markl G., Marten B., Nama D., Norrby P.-O., Norrby P.-O., Norrby P.-O., Norrby P.-O., Oslob J. D., Pregosin P. S., Ramdeehul S., Smidt J., Solin N., Stephens P. J., Svensen N., Tani K., Tannor D. J, Trost B. M., Trost B. M., Trost B. M., Trost B. M., Trost B. M., Trost B. M., Trost B. M., Trost B. M., Trost B. M., Trost B. M., Trost B. M., Trost B. M., Trost B. M., Vrieze K., Wang C.   +82 more
core   +1 more source

Design, Synthesis, and Photophysical Studies of Functionalized Polyaromatic Isonitriles as Visible Light Photoredox Catalysts

European Journal of Organic Chemistry, EarlyView.
A new series of structurally rich polyaromatic isonitriles is presented as photoredox catalysts. Their photophysical properties are investigated by UV–Vis absorption and fluorescence measurements, combined with experimental and theoretical studies to evaluate both ground‐ and excited‐state redox properties.
Cristina Martini, Camilla Russo, Jussara Amato, Carmine Volpe, Francesca Brunelli, Laurence Grimaud, Maxime R. Vitale, Greta Donati, Andrea Basso, Mariateresa Giustiniano   +9 more
wiley   +1 more source

Uncovering the Mechanisms of Long-Range Magnetic Order in [Mn(mal)(H₂O)]_n: Insights from Microscopic and Macroscopic Magnetic Analysis

Magnetochemistry
In this study, we investigate the magnetic properties of the molecular compound [Mn(mal)(H2O)]ₙ (mal = dianion of malonic acid) by integrating microscopic and macroscopic characterization, combining unpolarized neutron diffraction and magnetometry ...
Fernando S. Delgado, Laura Cañadillas-Delgado, Juan Rodríguez-Carvajal, Óscar Fabelo, Jorge Pasán   +4 more
doaj   +1 more source

Adsorption properties of surfaces silochrom C-120 grafted acetylacetonate layers of transition metals [PDF]

, 2017
Studied the adsorption properties of the surface Silipor 200 and chemically modified on the basis of its sorption materials containing acetylacetonates, ethylacetoacetate, malonates of nickel.
Ващенко, Е. А., Пахнутова, Е. А.   +1 more
core  

NIR Calibrations for Soybean Seeds and Soy Food Composition Analysis: Total Carbohydrates, Oil, Proteins and Water Contents [v.2] [PDF]

, 2011
Conventional chemical analysis techniques are expensive, time consuming, and often destructive. The non-invasive Near Infrared (NIR) technology was introduced over the last decades for wide-scale, inexpensive chemical analysis of food and crop seed ...
Doina M. Costescu, I. C. Baianu, Jun Guo, Randall L. Nelson, Tiefeng You   +4 more
core   +2 more sources

Rh(III)‐Catalyzed [4+2] Annulation of Imidazoles With α‐Diazocarbonyl Compounds: Direct Access to π‐Conjugated Imidazole‐Fused Isoquinolinone

European Journal of Organic Chemistry, EarlyView.
A Rh(III)‐catalyzed [4 + 2] annulation of 2‐aryl imidazoles/benzimidazoles with α‐diazocarbonyl compounds is developed for the synthesis of π‐conjugated imidazo/benzimidazo[2,1‐a]isoquinolinones systems. Mechanistic studies and control experiment reveal that the reaction proceeds via imidazole‐directed ortho C(sp2)–H activation, followed by carbene C–H
Ganesh P. Pawar, Duc Huy Le, Li Ching Shen, Sheng‐Cih Huang, Chung‐Ming Sun   +4 more
wiley   +1 more source