Results 61 to 70 of about 9,019 (233)

New Carbene Donor for Biocatalysis: Stereodivergent Synthesis of Pyridyl Cyclopropanes via Enzymatic Activation of Pyridyltriazoles

Hemoproteins have recently emerged as powerful biocatalysts for new-to-nature carbene transfer reactions. Despite this progress, these strategies have remained largely limited to diazo-based carbene precursor reagents.
Rudi , Fasan, Yong, Zhang, Satyajit, Roy, Jia-Min, Chu, Xinyi , Zhao, Thakshila , Dayananda, Yining, Wang   +6 more
core   +1 more source

Synthesis of a novel chemotype via sequential metal-catalyzed cycloisomerizations

Beilstein Journal of Organic Chemistry, 2012
Sequential cycloisomerizations of diynyl o-benzaldehyde substrates to access novel polycyclic cyclopropanes are reported. The reaction sequence involves initial Cu(I)-mediated cycloisomerization/nucleophilic addition to an isochromene followed by ...
Bo Leng, Stephanie Chichetti, Shun Su, Aaron B. Beeler, John A. Porco Jr.   +4 more
doaj   +1 more source

Charge State Influence on Stability and Isomerism in Dehydrogenated PAHs: Insights from Anthracene, Acridine, and Phenazine

ChemPhysChem, Volume 26, Issue 6, March 15, 2025.
The ionization of anthracene, acridine, and phenazine has been explored, along with the removal of one and two hydrogen atoms, to provide valuable information for astrochemists and to understand the behavior of the resulting structures and their electronic reorganization. Abstract In this study, we systematically explored the stability and isomerism of
Khaldia Zghida, Farouk Hamza Reguig, Manuel Alcamí, Al Mokhtar Lamsabhi   +3 more
wiley   +1 more source

Regiospecific synthesis of alkylidene cyclopropanes

, 1979
Alkylidene cyclopropanes are prepared from carbonyl compounds and α-selenolithiocyclopropane with formation of new C-C ...
Krief, A., Halazy, Serge
core   +1 more source

Total synthesis of avenaol

Nature Communications, 2017
Avenaol is a potent germination stimulant that can be extracted from black oat. Here, the authors report the total synthesis of avenaol by developing a strategy to access all-cis-substituted cyclopropanes.
Motohiro Yasui, Rina Ota, Chihiro Tsukano, Yoshiji Takemoto   +3 more
doaj   +1 more source

Iminodirhodium‐ and Iminocopper‐Catalyzed CH Activation: Chemoselective Oxidation of Alcohols and Aldehydes via Intermolecular Hydride Abstraction

European Journal of Organic Chemistry, EarlyView.
Chemoselective hydride abstractor iminometalloids, derived from O‐mesylacetoxime (MAO) using Rh2(II/II) or Cu(I) catalysts, can activate the C–Hα bonds of alcohols and aldehydes ultimately forming ketones, carboxylic acids, and esters even in the presence of C–H bonds with comparable bond strengths.
Raghunath Reddy Anugu, John R. Falck, Adeniyi M. Adebesin   +2 more
wiley   +1 more source

Uncovering the Neglected Similarities of Arynes and Donor-Acceptor Cyclopropanes [PDF]

, 2019
Arynes and donor-acceptor (D-A) cyclopropanes are two classes of strained systems having the potential for numerous applications in organic synthesis.
Akkattu T. Biju, Werz, Daniel B, Werz, Daniel B., Biju, Akkattu T, Daniel B. Werz, Biju, Akkattu T.   +5 more
core   +1 more source

General and Scalable Approach to Trifluoromethyl-substituted Cyclopropanes

, 2023
CF3-cyclopropanes were prepared on a multigram scale by deoxyfluorination of cyclopropane carboxylic acids or their salts with sulfur tetrafluoride.
Karen , Tarasenko, Iryna , Sadkova, Serhii , Trofymchuk, Maksym, Bugera, Anton, Klipkov, Oleh , Stanko, Mykola , Zheludenko, Volodymyr , Ahunovych, Pavel, Mykhailiuk, Andrii , Boretskyi   +9 more
core   +1 more source

Aldehyde–Olefin Couplings by Photoinduced Reduction of Electron‐Deficient Olefins with Hantzsch Ester Anions

Angewandte Chemie, Volume 138, Issue 25, 15 June 2026.
Single‐electron transfer‐mediated reductive carbonyl–olefin couplings are valuable carbon–carbon bond forming reactions. However, limitations persist for couplings of aliphatic aldehydes with electron‐deficient olefins. Here, we report a simple, photocatalyst‐free protocol that overcomes these limitations by using a Hantzsch ester anion as a ...
Zhihang Li, Adam Noble
wiley   +2 more sources

Main‐chain polyfullerenes: Taking fullerene to the next dimension

Polymer International, EarlyView.
This short review appraises main‐chain polyfullerenes. Their slow development over 30 years has suddenly boomed with a rapid growth due to exciting developments in solar energy. Abstract This mini‐review gives an overview of the development, chemistry, properties and applications of main‐chain polyfullerenes.
Marco Antônio GB Gomes, Orisson Ponce Gomes, Patricia Targon Campana, Didier Bégué, Roger C Hiorns   +4 more
wiley   +1 more source