Results 81 to 90 of about 37,707 (289)

Tuning the Performance of Poly(quaterphenyl piperidinium) Anion‐Exchange Membranes by Monomer Configuration

Advanced Energy Materials, EarlyView.
Ether‐free poly(quaterphenyl piperidinium) ionomers are prepared by superacid‐mediated polyhydroxyalkylations and explored as hydroxide conducting membranes. The para‐meta configuration of the quaterphenyl monomer greatly influences polymer backbone flexibility.
Pegah Mansouri Bakvand, Dong Pan, Andrit Allushi, Patric Jannasch   +3 more
wiley   +1 more source

“Naked Nickel”‐Catalyzed Heteroaryl–Heteroaryl Suzuki–Miyaura Coupling

Angewandte Chemie, EarlyView.
We report that an air‐stable “naked nickel”, Ni(4‐CF3stb)3, can efficiently catalyze heteroaryl–heteroaryl Suzuki–Miyaura cross‐coupling (SMC) reactions in the absence of exogenous ligands. This protocol permits the construction of >15 different heterobiaryls containing multiple Lewis basic heteroatoms from a broad set of 6‐membered heteroaryl bromides
Rakan Saeb, Byeongdo Roh, Josep Cornella
wiley   +2 more sources

Visible‐Light‐Driven Multifunctional Luminogens With More Than 150 Nm Absorption Band Separation for Dynamic Information Encryption

Aggregate, EarlyView.
A series of stimuli‐responsive molecular photoswitches featuring near‐infrared second aggregation‐induced emission (AIE) and impressive acid/base‐driven switching are constructed and molecular logic gate applications are realized. ABSTRACT Information security protection has become a fundamental issue in the human life, national security, and social ...
Shijie Zhen, Fayun Ma, Hong Chen, Lin Li, Meijing Li, Zujin Zhao, Ben Zhong Tang   +6 more
wiley   +1 more source

The crystal structure and Hirshfeld surface analysis of 1-(2,5-dimethoxyphenyl)-2,2,6,6-tetramethylpiperidine

Acta Crystallographica Section E: Crystallographic Communications, 2020
In the title compound, C17H27NO2, the piperidine ring has a chair conformation and is positioned normal to the benzene ring. In the crystal, molecules are linked by C—H...O hydrogen bonds, forming chains propagating along the c-axis direction.
Mustapha Tiouabi, Raphaël Tabacchi, Helen Stoeckli-Evans   +2 more
doaj   +1 more source

Synthesis of Five‐Membered Heterocycle Fused Quinazolinone Via Buchwald–Hartwig Cross Coupling Reaction

Asian Journal of Organic Chemistry, EarlyView.
Efficient Buchwald‐Hartwig cross‐coupling reactions were utilized to synthesize quinazolinone derivatives with a five‐membered heterocyclic ring substituted onto the quinazolinone structure, through reactions with various 2‐amino pyridine derivatives. This synthetic method is applicable to a total of six different five‐membered heterocyclic compounds ...
Jimin Moon, Hyojin Lee, Taeho Lee
wiley   +1 more source

Azobenzene‐Oxindole Photochromic Dyads

Angewandte Chemie, EarlyView.
A novel photochromic azobenzene‐oxindole dyad is reported. The combination of the two switches promotes drastic molecular geometry changes and allows for precise NMR quantification. This enables the study of the photokinetic behavior under different irradiation conditions and the discovery of a unique photokinetic relationship between the two ...
Marco Ovalle, Daniel Doellerer, Ben L. Feringa   +2 more
wiley   +2 more sources

A Novel Merocyanine Derivative for Probing Polarity at Cubosome Interfaces

Asian Journal of Organic Chemistry, EarlyView.
This study develops a synthetic route to C10SP, a polarity‐sensitive sensor embedded in phytantriol‐based cubosomes. Strategic steps included tertiary amine‐mediated amidation to covalently attach a hydrophobic tail and controlled nitrogen methylation to form the iminium moiety within the indolenine scaffold.
Marcelo J. Eberhardt, Natália E. T. de Castro, Fabiano S. Rodembusch, Fernanda Poletto   +3 more
wiley   +1 more source

Benzamide‐Directed Hydroarylative Cross‐Couplings Using Minimally Activated Alkenes: Enantioselective Synthesis of Tertiary and Quaternary Stereocenters

Angewandte Chemie, EarlyView.
Benzamide‐directed iridium‐catalyzed branched selective and enantioselective C(sp2)‐H additions to minimally activated alkenes give tertiary and quaternary benzylic stereocenters under byproduct‐free conditions. The processes are enabled by a family of SPINOL‐based homochiral diphosphonite ligands.
Timothy P. Aldhous, Raymond Chung, Abbas Hassan, Andrew G. Dalling, Phillippa Cooper, Simon Grélaud, Richard J. Mudd, Lyman J. Feron, Paul D. Kemmitt, John F. Bower   +9 more
wiley   +2 more sources

Stereoselective nucleophilic addition reactions to cyclic N-acyliminium ions using the indirect cation pool method: Elucidation of stereoselectivity by spectroscopic conformational analysis and DFT calculations

Beilstein Journal of Organic Chemistry, 2018
In this study, six-membered N-acyliminium ions were generated by the “indirect cation pool” method and reacted with several nucleophiles. These reactions afforded disubstituted piperidine derivatives with high diastereoselectivities and good to excellent
Koichi Mitsudo, Junya Yamamoto, Tomoya Akagi, Atsuhiro Yamashita, Masahiro Haisa, Kazuki Yoshioka, Hiroki Mandai, Koji Ueoka, Christian Hempel, Jun-ichi Yoshida, Seiji Suga   +10 more
doaj   +1 more source

Mannich Reaction of Secondary Benzylzinc Reagents: Synthesis of α,β‐Disubstituted β‐Arylethylamines

Asian Journal of Organic Chemistry, EarlyView.
The organometallic Mannich multicomponent reaction (MCR) of secondary benzylzinc reagents is described. The final α,β‐disubstituted β‐arylethylamines are obtained in generally high yields. The reaction is however characterized by a general lack of diastereoselectivity. A possible explanation is provided.
Baptiste Leroux, Federico Banchini, Olivier Jackowski, Alejandro Perez‐Luna, Fabrice Chemla, Marc Presset, Erwan Le Gall   +6 more
wiley   +1 more source