Results 71 to 80 of about 1,389 (161)

A Novel Cycloaddition Reaction of Thermally Generated Sulfenes

CHIMIA, 1992
The highly strained ?-sultine 4, resulting from the addition of SO2 to benzobenzvalene, is shown to undergo a thermal cycloreversion which gives 1H-indene-1-thiocarbaldehyde dioxide (6) as an intermediate and subsequently 1H-indene-1 ...
Ulrich Burger, Serge P. Schmidlin, Jiri Mareda, Gerald Bernardinelli   +3 more
doaj   +2 more sources

Imidazoline‐Proline and Imidazoline‐Prolinate Ligands for Copper‐Catalyzed Asymmetric Exo‐Selective [3 + 2] Cycloaddition of Iminoesters with Nitroalkenes

ChemistryEurope, Volume 4, Issue 1, January 2026.
From a modular synthesis of nonphosphine chiral nitrogen‐based chiral imidazoline–amino acid ligands, two new chiral imidazoline–proline‐copper catalysts are developed for targeting exo‐selective [3 + 2] cycloaddition reaction. Density functional theory studies rationalize the observed stereoselectivity and the distinct chiral pockets of the two ...
Yan Yu, Takuya Shimada, Chihiro Tokumitsu, Ayaka Fujiwara, Takayoshi Arai   +4 more
wiley   +1 more source

SuFExable NH-Pyrazoles via 1,3-Dipolar Cycloadditions of Diazo Compounds with Bromoethenylsulfonyl Fluoride. [PDF]

J Org Chem, 2022
Yamanushkin P, Kaya K, Feliciano MAM, Gold B.   +3 more
europepmc   +1 more source

Molecular Engineering of Donor–Acceptor Structures in Fullerene‐Indacenodithiophene Photocatalysts for Efficient Hydrogen Evolution

Carbon Neutralization, Volume 5, Issue 1, January 2026.
A molecular engineering strategy is applied to tune donor side chains and fullerene cage size in supramolecular organic photocatalysts. Structural modulation enhances π–π stacking, charge transport, and light absorption. The optimized SA‐C70‐IDTT architecture achieves efficient hydrogen evolution of 17.16 mmol g−1 h−1, highlighting donor–acceptor ...
Yupeng Song, Zihui Hua, Guangchao Han, Chong Wang, Ying Jiang, Tianyang Dong, Ruizhi Liu, Rui Wen, Chunru Wang, Jiechao Ge, Bo Wu   +10 more
wiley   +1 more source

Acceleration of 1,3-Dipolar Cycloadditions by Integration of Strain and Electronic Tuning. [PDF]

J Am Chem Soc, 2021
Dones JM, Abularrage NS, Khanal N, Gold B, Raines RT.   +4 more
europepmc   +1 more source

Exploring Isophorone‐Based Dienones: Comprehensive Insights Into Their Synthesis, Reactivity, and Diverse Applications

Journal of Chemistry, Volume 2026, Issue 1, 2026.
Isophorone is an important motif in synthetic organic chemistry, as it is highly reactive and can get involved in a diverse array of functional group transformations to access various synthetic intermediates and molecular targets. In this context, an important group of compounds is the conjugated or nonconjugated isophorone‐cored dienones, which are ...
M. Saeed Abaee, Mohammad M. Mojtahedi, Sohini Basu Roy   +2 more
wiley   +1 more source

Regio- and Diastereoselective 1,3-Dipolar Cycloadditions of 1,2,4-Triazin-1-ium Ylides: a Straightforward Synthetic Route to Polysubstituted Pyrrolo[2,1-f][1,2,4]triazines. [PDF]

ACS Omega, 2022
Galeta J, Šlachtová V, Dračínský M, Vrabel M.   +3 more
europepmc   +1 more source

Dimerization reactions of aryl selenophen-2-yl-substituted thiocarbonyl S-methanides as diradical processes: a computational study

Beilstein Journal of Organic Chemistry, 2017
An intriguing stepwise diradical mechanism of the dimerization of the reactive intermediate (thiocarbonyl S-methanide) appearing in the reaction of phenyl selenophen-2-yl thioketone with diazomethane was studied by means of computational methods.
Michael L. McKee, Grzegorz Mlostoń, Katarzyna Urbaniak, Heinz Heimgartner   +3 more
doaj   +1 more source

Nitropyridines as 2π-Partners in 1,3-Dipolar Cycloadditions with N-Methyl Azomethine Ylide: An Easy Access to Condensed Pyrrolines. [PDF]

Molecules, 2021
Bastrakov MA, Fedorenko AK, Starosotnikov AM, Shakhnes AK.   +3 more
europepmc   +1 more source

Multicomponent syntheses of pyrazoles via (3 + 2)-cyclocondensation and (3 + 2)-cycloaddition key steps

Beilstein Journal of Organic Chemistry
Pyrazoles are rarely found in nature but are traditionally used in the agrochemical and pharmaceutical industries, while other areas of use are also actively developing. However, they have also found numerous other applications.
Ignaz Betcke, Alissa C. Götzinger, Maryna M. Kornet, Thomas J. J. Müller   +3 more
doaj   +1 more source