Results 91 to 100 of about 19,882 (280)

Concise Synthesis of (+)-allo-Kainic Acid via MgI2-Mediated Tandem Aziridine Ring Opening-Formal [3+2] Cycloaddition [PDF]

, 2013
3-Methyl vinyl aziridine undergoes a mild MgI2-promoted S(N)2' ring opening and concomitant cyclization with fumarate Michael acceptors to give trisubstituted pyrrolidines. The process is efficient and highly diastereoselective. This methodology has been
Aggarwal, Varinder K., Arena, Giada, Chen, Chia-Chun, Leonori, Daniele   +3 more
core   +1 more source

Energy Transfer Catalysis Enabled 2,2,2‐Trifluoroethoxy‐Amination of Olefins

ChemistryEurope, EarlyView.
A thioxanthone‐catalyzed 2,2,2‐trifluoroethoxyamination of olefins is developed using unprecedented, easily prepared, and bench‐stable oxime ethers via the generation of alkoxy and iminyl radicals. The controlled intermolecular addition of the alkoxy radical to an olefin, over possible competing side processes, is critical.
Floriane Doche, Thibault Gallavardin, Thomas Poisson, Tatiana Besset   +3 more
wiley   +1 more source

Reactivity of δ‐Functionalized Para‐Quinone Methides in Nucleophilic Addition Reactions

Chemistry – A European Journal, EarlyView.
The reactivities of δ‐functionalized para‐quinone methides (pQMs) were characterized by kinetic studies of their reactions with carbanions in DMSO. Evaluating the second‐order rate constants (k2) by the Mayr‐Patz equation gave the electrophilicities E of pQMs.
Christoph Gross, Andreas Eitzinger, Peter Mayer, Armin R. Ofial   +3 more
wiley   +1 more source

Iodine-catalyzed diazo activation to access radical reactivity

Nature Communications, 2018
Radical reactivity of diazo compounds, useful organic building blocks, is yet underexplored. Here, the authors report an iodine-catalyzed radical activation of diazo compounds affording a variety of substituted cyclopropanes, pyrroles and epoxides under ...
Pan Li, Jingjing Zhao, Lijun Shi, Jin Wang, Xiaodong Shi, Fuwei Li   +5 more
doaj   +1 more source

Olefin Cyclopropanation via Carbene Transfer Catalyzed by Engineered Cytochrome P450 Enzymes [PDF]

, 2013
Transition metal–catalyzed transfers of carbenes, nitrenes, and oxenes are powerful methods for functionalizing C=C and C–H bonds. Nature has evolved a diverse toolbox for oxene transfers, as exemplified by the myriad monooxygenation reactions catalyzed ...
Arnold, Frances H., Brustad, Eric M., Coelho, Pedro S., Kannan, Arvind   +3 more
core  

Stereoselective synthesis of tetrahydroindolizines via catalytic formation of pyridinium ylides from diazo compounds [PDF]

, 2016
Commercially available iron (III) and copper (I) complexes catalyze new multicomponent cycloadditions between diazo compounds, pyridines and electrophilic alkenes to give alkaloid-inspired tetrahydroindolizidines in high yields and diastereoselectivities.
Aggarwal, Aggarwal, Allgäuer, Barluenga, Bayazit, Brioche, Chen, Choi, Day, Franke, Fulton, Galliford, Gillingham, Guo, Hodgson, Lee, Lemercier, Lerchner, Li, Liu, Maurya, Michael, Nicolle, Ortega, Padwa, Teodoro, Wang, Xu, Zhao, Zhu   +29 more
core   +1 more source

The Genuine Carbene Conundrum

Chemistry – A European Journal, EarlyView.
From fleeting intermediates to well‐defined molecular structures, carbenes (neutral divalent carbon) remind us that the most reactive ideas often make a large impact. Despite their wide‐ranging applications, the direct characterization of these reactive species remains a persistent experimental challenge.
Bethany Sawyer, Jesse. L. Peltier, Rodolphe Jazzar   +2 more
wiley   +1 more source

Evaluating the thermal vinylcyclopropane rearrangement (VCPR) as a practical method for the synthesis of difluorinated cyclopentenes : experimental and computational studies of rearrangement stereospecificity [PDF]

, 2014
Vinyl cyclopropane rearrangement (VCPR) has been utilised to synthesise a difluorinated cyclopentene stereospecifically and under mild thermal conditions.
Adam, Anderl, Antony, Audouard, Bakalova, Baldwin, Baldwin, Baldwin, Barth, Becke, Benson, Bowry, Brahms, Bremer, Buttle, Csuk, Danheiser, Davidson, Dolbier, Dolbier, Dolbier, Doubleday, Ellis, Erbes, Eusterwiemann, Fedoryński, Goldschmidt, Grimme, Gritsch, Harrington, Houk, Hudlicky, Itoh, Jiao, Kobayashi, Kobayashi, Kyne, Lee, Lewis, Li, Loncharich, Mase, Maskill, Miles, Mitsch, Morikawa, Mulzer, Munemori, Nendel, Neureiter, Newcomb, Newcomb, ONeal, Overberger, Percy, Roth, Schlag, Seyferth, Seyferth, Shibuya, Smart, Tian, Tian, Vatèle, Vogel, Wang, Wang, Wellington, Willcott, Willcott, Yang, Yudin, Zeiger, Zhao, Zhao, Zhao, Zuo   +76 more
core   +1 more source

Structure of Cyclopropane [PDF]

Nature, 1948
ALTHOUGH I am pleased to note that Dr. A. D. Walsh has made a final contribution to this discussion, it may nevertheless be possible to correct a mis-statement. He says1 that I take the usual formula to represent only the position in space of the atoms involved. What I actually wrote was2: ". . . to the usual formulae. These represent nothing more than
openaire   +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