Results 31 to 40 of about 10,075 (214)

Substrate‐Controlled Enantiodivergence in Ni‐Catalyzed Access to Phosphorylated Oxindoles With Quaternary Stereocenters

Angewandte Chemie, EarlyView.
An efficient, enantiodivergent synthesis of phosphorylated oxindoles with quaternary stereocenters is achieved via a nickel‐catalyzed intermolecular Heck‐phosphorylation cascade. Employing a single chiral catalyst, either product enantiomer is selectively accessed simply by changing the alkene leaving group. DFT calculations trace this stereodivergence
Haimeng Zhu, Lewen Wang, Shihui Luo, Xinglong Zhang, Jun (Joelle) Wang   +4 more
wiley   +2 more sources

Enantiomeric Tartaric Acid Production Using cis-Epoxysuccinate Hydrolase: History and Perspectives

Molecules, 2019
Tartaric acid is an important chiral chemical building block with broad industrial and scientific applications. The enantioselective synthesis of l(+)- and d(−)-tartaric acids has been successfully achieved using bacteria presenting cis ...
Jinsong Xuan, Yingang Feng
doaj   +1 more source

Toward the Synthesis of Pestalustaine A: Structural Revision and Formation of Original Strained Tricyclic Architectures

Angewandte Chemie, EarlyView.
Our synthetic endeavor toward the total synthesis of the reported unprecedented tricyclic skeleton of the sesquiterpene pestalustaine A allowed us to perform divergent cyclizations of a bicyclo[4.4.1]undec‐3‐ene into complex tricyclic architectures and to revise the structure of the natural product.
Wei Cao, Alicia Ross, Jean‐Pierre Baltaze, Régis Guillot, Menglin Xu, Rongzhen Qin, Bingcheng Yang, Isabel Wong, Katayoon Formul, Cyrille Kouklovsky, Dean J. Tantillo, Vincent Gandon, Guillaume Vincent   +12 more
wiley   +2 more sources

Homochiral Acyl Isocyanates as Diagnostic NMR Probes for the Enantiomeric Purity of Chiral Alcohols

Sultan Qaboos University Journal for Science, 2000
The first reported acyl and sulfonylisocyanates were developed and tested in reactions with chiral alcohols to afford diastereomeric carbamates. NMR analysis of these investigates the chemical shift discrimination that would allow these activated ...
Gregory H. P. Roos, Anthony R. Donovanb
doaj   +1 more source

Chemical Composition, Enantiomeric Distribution and Anticholinesterase and Antioxidant Activity of the Essential Oil of Diplosthephium juniperinum

Plants, 2022
The aim of this study was to extract and identify the chemical compounds of Diplosthephium juniperinum essential oil (EO) from Ecuador and to assess its anticholinesterase and antioxidant properties. The EO chemical composition was determined by GC–MS. A
Melissa Salinas, James Calva, Luis Cartuche, Eduardo Valarezo, Chabaco Armijos   +4 more
doaj   +1 more source

Emergence of Chiral Defective Pores Through Chiral Linker Exchange in Nonchiral MOFs for Enantioselective Recognition

Angewandte Chemie, EarlyView.
Chiral recognition remains challenging due to minimal property differences. This work develops chiral defective MOFs via linker exchange to enable rapid, direct, luminescent enantioselective sensing, offering a simple, modular strategy that broadens MOF functionality for portable, low‐cost applications in pharmaceuticals, food safety, and environmental
Zongsu Han, Kun‐Yu Wang, Jiatong Huo, Joshua Rushlow, Zhaoyi Liu, Yihao Yang, Rong‐Ran Liang, Wei Shi, Hong‐Cai Zhou   +8 more
wiley   +2 more sources

Effects of Water Addition on a Catalytic Fluorination of Dienamine

Molecules, 2019
We investigate the effects of water addition on a highly stereocontrolled fluorination of dienamine generated by α-branched enals and 6′-hydroxy-9-amino-9-deoxy-epi-quinidine with N-fluorobenzenesulfonimide (NFSI) in the presence of Brø ...
Daiki Kuraoku, Tsunaki Yonamine, Genta Koja, Norio Yoshida, Satoru Arimitsu, Masahiro Higashi   +5 more
doaj   +1 more source

Advancing Lithium–Oxygen Batteries: Pioneering Cathode Catalyst Innovation and Artificial Intelligence‐Driven Design Paradigms

Advanced Materials, EarlyView.
This review summarizes the principles and challenges of nonaqueous lithium‐oxygen batteries and recent advances in cathode catalysts, including carbon‐based materials, metals, oxides, sulfides, nitrides, carbides, and redox mediators. It highlights emerging design strategies and artificial intelligence‐driven approaches, emphasizing data‐assisted ...
Yuqing Yao, Chongyang Hao, Karol Viviana Mejia‐Centeno, Malik Dilshad Khan, Shang Wang, Longqiu Li, Yanhong Tian, Andreu Cabot, Qing Sun   +8 more
wiley   +1 more source

Functional and Network PHAs via Stereoselective Polymerization and Tailored Post‐Transformation

Angewandte Chemie, EarlyView.
Catalyst‐controlled stereoselective (co)polymerization of functionalized lactones produces vinyl‐, allyl‐, and propargyl‐functionalized PHAs with high syndiotacticity and a broad applicable temperature window, which can be further transformed into crosslinked PHA thermosets, elastic supramolecular networks, and functional grafts. ABSTRACT Incorporation
Ruirui Li, Yingluo Zhao, Jun‐Jie Tian, Ethan C. Quinn, Yunpeng Gao, Maëlle T. Gace, Eugene Y.‐X. Chen   +6 more
wiley   +2 more sources

Determination of enantiomeric excess of carboxylates by fluorescent macrocyclic sensors

Chemical Science, 2016
Chiral fluorescent macrocycles enable detection of carboxylate enantiomers using naked eye, which allows for quantitative measurement of the enantiomeric excess with high accuracy (error < 1.6%).
Akdeniz, Ali, Minami, Tsuyoshi, Watanabe, Sagiri, Yokoyama, Maki, Ema, Tadashi, Anzenbacher, Pavel   +5 more
openaire   +3 more sources