Concept
Éther-oxyde
Publications associées (144)
Advanced characterization of regioselectively substituted methylcellulose model compounds by DNP enhanced solid-state NMR spectroscopy
David Lyndon Emsley, Pierrick Berruyer, Pinelopi Moutzouri, Michel Bardet
Dynamic Nuclear Polarization MAS NMR is introduced to characterize model methylcellulose ether compounds at natural isotopic abundance. In particular an approach is provided to determine the position of the methyl ether group within the repeating unit. Spe ...
2021Multimodal host–guest complexation for efficient and stable perovskite photovoltaics
Michael Graetzel, Shaik Mohammed Zakeeruddin, David Lyndon Emsley, Ursula Röthlisberger, Felix Thomas Eickemeyer, Jovana Milic, Michael Allan Hope, Marko Mladenovic, Ulf Anders Hagfeldt, Hong Zhang, Dan Ren, Zaiwei Wang, Paramvir Ahlawat, Aditya Mishra, Zhaowen Dong, Farzaneh Jahanbakhshi, Anurag Krishna, Jinming Guo, Olivier Ouellette, Zhiwen Zhou, Tzu-Sen Su
Formamidinium lead iodide perovskites are promising light-harvesting materials, yet stabilizing them under operating conditions without compromising optimal optoelectronic properties remains challenging. We report a multimodal host–guest complexation strat ...
2021Access to Vinyl Ethers and Ketones with Hypervalent Iodine Reagents as Oxy-Allyl Cation Synthetic Equivalents
We report an Umpolung strategy of enol ethers to generate oxy-allyl cation equivalents based on the use of hypervalent iodine reagents. Under mild basic conditions, the addition of nucleophiles to aryloxy-substituted vinylbenziodoxolone (VBX) reagents, eas ...
WILEY-V C H VERLAG GMBH2020Mechanistic Study of Diaryl Ether Bond Cleavage during Palladium-Catalyzed Lignin Hydrogenolysis
Hydrogenolysis has emerged as one of the most effective means of converting polymeric lignin into monoaromatic fragments of value. Reported yields may be higher than for other methods and can exceed the theoretical yields estimated from measures of the con ...
WILEY-V C H VERLAG GMBH2020Radical-Cation Cascade to Aryltetralin Cyclic Ether Lignans Under Visible-Light Photoredox Catalysis
Qian Wang, Jieping Zhu, Jia-Chen Xiang
The development of concise, sustainable, and cost-effective synthesis of aryltetralin lignans, bearing either a fused lactone or cyclic ether, is of significant medicinal importance. Reported is that in the presence of Fukuzumi's acridinium salt under blue ...
WILEY-V C H VERLAG GMBH2020Data-Driven Advancement of Homogeneous Nickel Catalyst Activity for Aryl Ether Cleavage
Matthew Wodrich, Benjamin André René Meyer, Manuel Cordova, Boodsarin Sawatlon
The increasing urgency to make chemical processes more environmentally friendly while continuing to derive the chemicals required for modern society from renewable resources requires the development of a forthcoming generation of synthetic processes and th ...
AMER CHEMICAL SOC2020Triazene-Activated Donor–Acceptor Cyclopropanes: Ring-Opening and (3 + 2) Annulation Reactions
Rosario Scopelliti, Kay Severin, Jérôme Waser, Farzaneh Fadaei Tirani, Abdusalom Suleymanov, Zhaowen Dong, Bastian Antoine Rodolphe Claude Muriel, Eliott Hugo Joran Le Du
Donor–acceptor cyclopropanes substituted with 3,3-dialkyltriazenyl groups are described herein. The strong electron-donating character of the triazene renders the cyclopropanes highly reactive, allowing for catalyst-free ring-opening reactions with methano ...
2020Photocatalytic Umpolung of N- and O-substituted alkenes for the synthesis of 1,2-amino alcohols and diols
Jérôme Waser, Stefano Nicolai, Stephanie Grace Elizabeth Amos
We report an organophotocatalytic 1,2-oxyalkynylation of ene-carbamates and enol ethers using Ethynyl BenziodoXolones (EBXs). 1-Alkynyl-1,2-amino alcohols and diols were obtained in up to 89% yield. Photocatalytic formation of radical cations led to Umpolu ...
ROYAL SOC CHEMISTRY2020Tailoring Chiral Cyclopentadienyl Rhodium(III) Catalysts for Enantioselective Alkenyl C-H functionalizations
Coralie Danielle Annick Duchemin
Chiral cyclopentadienyl (Cpx) metal complexes have empowered the developement of challenging asymmetric C(sp2)-H activation transformations. However the preparation of competent atropchiral Cpx ligands is long and tedious. Moreover the range of application ...
EPFL2020