Results 191 to 200 of about 77,706 (256)

Ordered Ionic‐Liquid Channels Enable Fast Anhydrous Proton Conduction at up to 240°C for Fuel Cells

Angewandte Chemie, EarlyView.
Infiltration of ionic liquids into a composite scaffold comprised of graphene and boron nitride nanosheets functionalised with positively charged polyethyleneimine produces robust proton conducting membranes for the intermediate temperature electrochemical devices.
Mazin Al‐Alawi, Kaiqiang He, Mattia Belotti, Fanmengjing Wang, Jiffin Oommen, Douglas R. MacFarlane, Hoang‐Long Du, Alexandr N. Simonov, Huanting Wang   +8 more
wiley   +1 more source

Chiral Phosphoric Acid-Catalyzed Enantioselective Pictet-Spengler Reaction for Concise Synthesis of CF₃-Substituted Tetrahydro-β-Carbolines. [PDF]

Org Lett
Umemiya S, Nara S, Terada M.
europepmc   +1 more source

Enantioselective Synthesis of Axially Chiral Diaryl Ethers via Rhodium‐Catalyzed [2 + 2 + 2] Cycloaddition

Angewandte Chemie, EarlyView.
An enantioselective rhodium‐catalyzed [2 + 2 + 2] cycloaddition enables the synthesis of axially chiral diaryl ethers. Carbonyl coordination ensures high reactivity and regioselectivity, affording products bearing up to four stereogenic axes with good enantio‐ and diastereoselectivity.
Yu Sato, Julong Jiang, Kairi Yamashiro, Ken Tanaka   +3 more
wiley   +1 more source

2-(Cyanomethyl)benzimidazole Derivatives as 1,3-Dicarbonyl Analogues for a Kinetically Controlled Diastereo- and Enantioselective Mannich-Type Reaction Catalyzed by Chiral Phosphoric Acid. [PDF]

Org Lett
Ye H, Hou L, Takeda A, Sato T, Yadav J, Kikuchi J, Bao M, Terada M.   +7 more
europepmc   +1 more source

Catalytic Functionalization of Unactivated π‐Bonds Enabled by Bidentate Directing Auxiliaries

Angewandte Chemie, EarlyView.
This review explores how bidentate directing auxiliaries have advanced transition‐metal catalysis for unactivated alkene/alkyne functionalization. By leveraging chelated intermediates, bidentate directing auxiliaries enable precise hydrofunctionalization, difunctionalization, and C─H activation of π‐bonds with unique selectivity and reactivity.
Seunghyeon Cho, Al Vicente Riano D. Lisboa, Juntao Sun, Taeho Kang, Keary M. Engle   +4 more
wiley   +1 more source

Unlocking the Phosphoric Acid Catalyzed Asymmetric Transfer Hydrogenation of 2-Alkenyl Quinolines for Efficient Flow Synthesis of Hancock Alkaloids. [PDF]

Org Lett
Nagy BS, Maestro A, Pericàs MA, Kappe CO, Ötvös SB.   +4 more
europepmc   +1 more source

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   +1 more source

Electrochemical Enantioselective Oxidation of Indoles via Chiral Phosphoric Acid Catalysis in Cooperation with H₃PO₄ in Aqueous Media. [PDF]

Angew Chem Int Ed Engl
Tan X, Zhou Z, Shao M, Sun J.
europepmc   +1 more source

Catalytic Enantioselective Intramolecular Aza‐Michael Addition to α,β‐Unsaturated Esters

Angewandte Chemie, EarlyView.
A general method for accessing enantioenriched saturated N‐heterocycles via a catalytic enantioselective intramolecular aza‐Michael reaction to α,β‐unsaturated esters is described. A superbasic bifunctional iminophosphorane (BIMP) catalyst was key to enabling reactivity of the high pKa sulfonamide pronucleophile, whilst delivering good to excellent ...
Evan G. W. Rutter, Cameron J. MacRae, Haoran Xiong, Daniel Rozsar, Katherine F. P. Clarke, Darren J. Dixon   +5 more
wiley   +1 more source

Enhancing wet phosphoric acid production efficiency with vanadium catalyst waste derived silica. [PDF]

Heliyon
Anouar I, Jouraiphy R, Mazouz H, Haneklaus N, Yousfi S, Bouamrani ML.   +5 more
europepmc   +1 more source