Results 81 to 90 of about 17,328 (234)

Hydrocarbons as Proton Receptors and Evidences of Unconventional and Unusual π···H, p-π···H and C···H Hydrogen Bonds

Orbital: The Electronic Journal of Chemistry, 2019
In this current work, a brief historical narrative of the most popular theories that decisively aid in the comprehension of the hydrogen bond formation is presented.
Boaz Galdino de Oliveira
doaj  

1,1‐and 1,2‐Diborylalkenes: Preparation and Synthetic Applications

Advanced Synthesis &Catalysis, Volume 368, Issue 12, 17 June 2026.
In this review, we highlight recent advances in the synthesis and reactivity of 1,1‐diborylalkenes and 1,2‐diborylalkenes, along with various transformations leading to C‐C, C‐heteroatom, and multicomponent products. By providing a comprehensive and practical resource, this review aims to assist researchers in exploring the synthetic utility of 1,1 and
Jayaram Vankudoth, Maruti Mali, Fabienne Berrée   +2 more
wiley   +1 more source

Iodine‐Mediated Electrochemical Diastereoselective Synthesis of Enaminones

ChemElectroChem, Volume 13, Issue 12, 17 June 2026.
This work describes an efficient electrochemical (EC) method for transforming thioamides into enaminones via reaction with organic diazo compounds. The electrochemical approach is cost‐effective, mild, and proceeds through the in situ electrochemical generation of a copper complex.
Ijaz Khan, Głowacki Michał P., Rybicka‐Jasińska Katarzyna   +2 more
wiley   +1 more source

Enantioselective Gas Chromatographic Analysis of Cyclopropane Derivatives [PDF]

, 2018
Chirasil-β-Dex was used as chiral stationary phase for the enantioselective gas chromatographic analysis of several new chiral cyclopropane derivatives.
Lacrampe, F., Grass, S., Müller, P., Jiang, Z., Ghanem, A., Aboul-Enein, H. Y.   +5 more
core  

Is Cyclopropane Really the sigma-Aromatic Paradigm?

, 2009
Dewar proposed the sigma-aromaticity concept to explain the seemingly anomalous energetic and magnetic behavior of cyclopropane in 1979. While a detailed, but indirect energetic evaluation in 1986 raised doubts-"There is no need to involve 'sigma ...
吴玮, Ma, Ben, Wu, Judy I-Chia（Univ Georgia, Dept Chem）, Wu, Wei, Schleyer, Paul von Rague（Univ Georgia, Dept Chem）, Mo, Yirong（ Western Michigan Univ, Dept Chem）   +5 more
core   +1 more source

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

Chemistry – A European Journal, Volume 32, Issue 23, 16 June 2026.
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

1,1‐Disubstituted Vinylbromides: Versatile Building Blocks for the Synthesis of Nitrogen‐Containing Heterocycles

European Journal of Organic Chemistry, Volume 29, Issue 23, 16 June 2026.
1,1‐Disubstituted vinylbromides are key intermediates for constructing nitrogen‐containing heterocycles. This review provides an overview of the synthetic applications of 1,1‐disubstituted vinylbromides and summarizes recent developments in reaction methodologies, mechanistic insights, and the structural diversity of N‐heterocyclic compounds accessible
Anne Westermeyer, Jun Fang, Chonghuo Liu, Guillaume Lefèvre, Gérard Guillamot, Phannarath Phansavath, Virginie Ratovelomanana‐Vidal   +6 more
wiley   +1 more source

Schwefel‐gesteuerter Aufbau von Vinylcyclopropanen ausgehend von 1,3‐Dienen

Angewandte Chemie, Volume 138, Issue 25, 15 June 2026.
Schwefel übernimmt die Kontrolle: Ein Thioether wirkt als molekularer Dirigent, der die Carbenaddition an 1,3‐Diene mit außergewöhnlicher Regio‐ und Diastereokontrolle lenkt. Dabei werden schwefelhaltige Vinylcyclopropane (S‐VCPs) erhalten, die mittels herkömmlicher Methoden nur schwer zugänglich sind.
Anna Keimer, Jonas Rettig, Tim‐Niclas Streit, Bob Barthel, Mélissa Calmels, Moritz Malischewski, Franz‐Lucas Haut   +6 more
wiley   +1 more source

Converting 1,1‐Bisborylalkanes into 1,2‐Bisborylalkanes Enabled by Iron Ligand‐to‐Metal Charge Transfer (LMCT) Photocatalysis

Angewandte Chemie, Volume 138, Issue 22, 25 May 2026.
1,2‐Bisborylalkanes are valuable intermediates for chemical synthesis as they could serve as a platform to generate value‐added products with two distinct functional groups at vicinal positions. A novel strategy to synthesize 1,2‐bisborylalkanes via Fe ligand‐to‐metal charge transfer (LMCT) photocatalysis is developed.
Zheye Zhang, George Chen, Michael Li, Carla Slebodnick, Diego Troya, Ming Chen   +5 more
wiley   +2 more sources

The Discovery and Future Prospects of Artificial Porphyrins: Molecular Batteries Functioning with the Reversible Formation and Cleavage of Cyclopropane Units

CHIMIA, 1996
The absence of the meso-hydrogen atoms in meso-octaalkylporphyrinogens enable the generation of novel forms of the oxidized porphyrinogen, 'artificial porphyrins'. A stepwise four-electron oxidation of meso-octaalkylporphyrinogen transitionmetal
Carlo Floriani
doaj   +2 more sources