Results 41 to 50 of about 3,271,959 (246)

Axially Chiral Nonalternant Polycyclic Aromatic Hydrocarbon With Consecutive Pentagons Exhibiting Large Spin‐Polarized Current

Angewandte Chemie, EarlyView.
Here we report two nonalternant polycyclic aromatic hydrocarbons (PAH) (1 and 2), which contain two and four consecutive pentagons, respectively. Under acidic conditions, 1 and 2 dimerize to afford the axially chiral dimers AC1 and AC2. The central azulene moiety in both 2 and AC2 shows an unusually short transannular bond of 1.366 Å.
Chang Wang, Jiaxin Luo, Haipeng Lu, Junzhi Liu   +3 more
wiley   +2 more sources

Efficient synthesis of π-conjugated molecules incorporating fluorinated phenylene units through palladium-catalyzed iterative C(sp2)–H bond arylations

Beilstein Journal of Organic Chemistry, 2015
We report herein a two or three step synthesis of fluorinated π-conjugated oligomers through iterative C–H bond arylations. Palladium-catalyzed desulfitative arylation of heteroarenes allowed in a first step the synthesis of fluoroaryl-heteroarene units ...
Fatiha Abdelmalek, Fazia Derridj, Safia Djebbar, Jean-François Soulé, Henri Doucet   +4 more
doaj   +1 more source

Palladium-Catalyzed Direct (Het)arylation Reactions of Benzo[1,2-d:4,5-d′]bis([1,2,3]thiadiazole and 4,8-Dibromobenzo[1,2-d:4,5-d′]bis([1,2,3]thiadiazole)

Molecules, 2023
Palladium-catalyzed direct (het)arylation reactions of strongly electron-withdrawing tricyclic benzo[1,2-d:4,5-d′]bis([1,2,3]thiadiazole) and its 4,8-dibromo derivative were studied; the conditions for the selective formation of mono- and bis-aryl ...
Timofey N. Chmovzh, Timofey A. Kudryashev, Daria A. Alekhina, Oleg A. Rakitin   +3 more
doaj   +1 more source

Synthesis of Large‐ and Medium‐Sized Heterobiaryl Atropisomeric Rings and Atropopeptides by Catalytic Intramolecular SNAr

Angewandte Chemie, EarlyView.
Catalytic, intramolecular N‐heterocycle arylation by nucleophilic aromatic substitution (SNAr) is now available for synthesis of highly strained macrocycles and medium‐sized heterobiaryl atropisomeric rings, including atropopeptides. Key to the approach is the ability to generate a strong base catalytically, taking advantage of base‐embedding ...
Alireza Abbasi Kejani, Paritosh Dey, Nicholas H. Stillman, Daniel M. Andrade, Michal Šimek, Martin Dračínský, Daniel Bím, Paulo H. S. Paioti   +7 more
wiley   +2 more sources

Pd−Xantphos-Catalyzed Direct Arylation of Nucleosides

, 2016
Direct arylation of the exocyclic amino groups of nucleosides represents a simple approach to N-aryl nucleoside derivatives. To date, one limitation has been that only electron-deficient aryl bromides and triflates possessed adequate reactivity for ...
Felix N. Ngassa (2510620), Mahesh K. Lakshman (1554784), Edmund A.-H. Yeh (2300611), Theothora S. Melistas (2526742), Kyle A. DeKorver (1944499)   +4 more
core   +1 more source

Recent Developments in C–H Activation for Materials Science in the Center for Selective C–H Activation

Molecules, 2018
Organic electronics is a rapidly growing field driven in large part by the synthesis of π-conjugated molecules and polymers. Traditional aryl cross-coupling reactions such as the Stille and Suzuki have been used extensively in the synthesis of &pi ...
Junxiang Zhang, Lauren J. Kang, Timothy C. Parker, Simon B. Blakey, Christine K. Luscombe, Seth R. Marder   +5 more
doaj   +1 more source

Synthesis of a diaryliodonium salt and its use in the direct arylation of andole: a two-step experiment for the organic teaching laboratory [PDF]

, 2019
In the past decade, C–H functionalization has been a very active topic of research in both academia and industry. When a H atom is replaced by an aryl (or heteroaryl) group, the transformation is termed “direct arylation”.
Hickey, Aobha, Shanahan, Rachel, Harrington, Francis, Byrne, Peter A., Schnürch, Michael, David Schönbauer, Gerard P. McGlacken, Schönbauer, David, Aobha Hickey, McGlacken, Gerard P., Rachel Shanahan, Peter A. Byrne, Prendergast, Aisling M., Aisling M. Prendergast, Michael Schnürch, Francis Harrington   +15 more
core   +1 more source

Regioselective Direct C−H Bond (Hetero)arylation of Thiazoles Enabled by a Novel Iminopyridine-Based α‐Diimine Nickel(II) Complex Evaluated by DFT Studies. [PDF]

, 2023
Direct C−H bond arylation is a highly effective method for synthesizing arylated heteroaromatics. This method reduces synthetic steps and minimizes the formation of impurities. We report an air and moisture-stable iminopyridine-based α-diimine nickel (II)
John , Michael O. Cue, Md Muktadir , Talukder, Mihaela , C. Stefan, Shubham, Chatterjee, Phillip , Damien E. Arche, Justin, T. Miller, Richard , Lord, G. Andrés , Cisneros, Chinthaka , M. Udamulle Gedara, Michael , C. Biewer   +9 more
core   +2 more sources

Z‐Retentive Enantioselective Rh‐Catalyzed Hydroarylation of E,Z‐Dienes

Angewandte Chemie, EarlyView.
The Rh‐catalyzed hydroarylation of conjugated E,Z‐dienoates is found to proceed with high selectivity for addition to the E‐alkene unit. Mechanistic analysis of this Z‐retentive process points towards preferred binding of the E‐alkene unit to a Rh‐aryl species to give rise to the observed selectivity and that Rh‐enolate protonolysis to be turnover ...
Wesley McNutt, Hima Kozhummal, Abdullah Al‐Mashqbeh, Alex Brown, Rylan J. Lundgren   +4 more
wiley   +2 more sources

A visible-light-induced, metal-free bis-arylation of 2,5-dichlorobenzoquinone

Beilstein Journal of Organic Chemistry, 2021
A metal-free protocol for the direct bis-arylation of 2,5-dichlorobenzoquinone with aryldiazonium salts is reported. The reactive salts are generated in situ and converted to radicals through irradiation with visible light.
Pieterjan Winant, Wim Dehaen
doaj   +1 more source