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Source: Angewandte Chemie
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Total 98 results found since Jan 2013.
Atomically Dispersed Cobalt/Copper Dual-Metal Catalysts for Synergistically Boosting Hydrogen Generation from Formic Acid
Angew Chem Int Ed Engl. 2023 Sep 11:e202313099. doi: 10.1002/anie.202313099. Online ahead of print.ABSTRACTThe development of practical materials for (de)hydrogenation reactions is a prerequisite for the launch of a sustainable hydrogen economy. Herein, we present the design and construction of an atomically dispersed dual-metal site Co/Cu-N-C catalyst allowing significantly improved dehydrogenation of formic acid, which is available from carbon dioxide and green hydrogen. The active catalyst centers consist of specific CoCuN6 moieties with double-N-bridged adjacent metal-N4 clusters decorated on a nitrogen-doped carbon su...
Source: Angewandte Chemie - September 11, 2023 Category: Chemistry Authors: Yanzhe Shi Bingcheng Luo Runqi Liu Rui Sang Dandan Cui Henrik Junge Yi Du Tianle Zhu Matthias Beller Xiang Li Source Type: research
Enzymatic Oxy- and Amino-Functionalization in Biocatalytic Cascade Synthesis: Recent Advances and Future Perspectives
Angew Chem Int Ed Engl. 2023 Aug 28:e202309012. doi: 10.1002/anie.202309012. Online ahead of print.ABSTRACTBiocatalytic cascades are a powerful tool for building complex molecules containing oxygen and nitrogen functionalities. Moreover, the combination of multiple enzymes in one pot offers the possibility to minimize downstream processing and waste production. In this review, we illustrate various recent efforts in the development of multi-step syntheses involving C-O and C-N bond-forming enzymes to produce high value-added compounds, such as pharmaceuticals and polymer precursors. Both in vitro and in vivo examples are d...
Source: Angewandte Chemie - August 28, 2023 Category: Chemistry Authors: Eleonora Grandi Fatma Feyza Özgen Sandy Schmidt Gerrit J Poelarends Source Type: research
Efficient and Direct Functionalization of Allylic sp3 C-H Bonds with Concomitant CO2 Reduction
Angew Chem Int Ed Engl. 2023 Aug 25:e202311731. doi: 10.1002/anie.202311731. Online ahead of print.ABSTRACTSolar-driven CO2 reduction integrated with C-C/C-X bond-forming organic synthesis represents a substantially untapped opportunity to simultaneously tackle carbon neutrality and create an atom-/redox-economical chemical synthesis. Herein, we demonstrate the first cooperative photoredox catalysis of efficient and tunable CO2 reduction to syngas, paired with direct alkylation/arylation of unactivated allylic sp3 C-H bonds for accessing allylic C-C products, over SiO2-supported single Ni atoms-decorated CdS quantum dots (...
Source: Angewandte Chemie - August 26, 2023 Category: Chemistry Authors: Ming-Yu Qi Yi-Jun Xu Source Type: research
Efficient Recycling of Gold and Copper from Electronic Waste by Selective Precipitation
Angew Chem Int Ed Engl. 2023 Aug 18:e202308356. doi: 10.1002/anie.202308356. Online ahead of print.ABSTRACTThe recycling of metals from electronic waste (e-waste) using efficient, selective, and sustainable processes is integral to circular economy and net-zero aspirations. Herein, we report a new method for the selective precipitation of metals such as gold and copper that offsets the use of organic solvents that are traditionally employed in solvent extraction processes. We show that gold can be selectively precipitated from a mixture of metals in hydrochloric acid solution using triphenylphosphine oxide (TPPO), as the c...
Source: Angewandte Chemie - August 18, 2023 Category: Chemistry Authors: Abhijit Nag Mukesh K Singh Carole A Morrison Jason Love Source Type: research
Palladium-Catalyzed Fluorinative Bifunctionalization of Aziridines and Azetidines with gem-Difluorocyclopropanes
Angew Chem Int Ed Engl. 2023 Aug 12:e202310283. doi: 10.1002/anie.202310283. Online ahead of print.ABSTRACTAn unprecedented Pd-catalyzed fluorinative bifunctionalization of aziridines and azetidines was successfully developed via regioselective C-C and C-F bond cleavage of gem-difluorocyclopropanes, leading to various β,β'-bisfluorinated amines and β,γ-bisfluorinated amines. This reaction was achieved by incorporating a 2-fluorinated allyl group and a fluorine atom scissored from gem-difluorocyclopropane in 100% atom economy for the first time. The mechanistic investigations indicated that the reaction underwent amine ...
Source: Angewandte Chemie - August 12, 2023 Category: Chemistry Authors: Dongdong Li Chaoren Shen Zhiyao Si Lu Liu Source Type: research
Chiral PSiSi-Ligand Enabled Iridium-Catalyzed Atroposelective Intermolecular C-H Silylation
Angew Chem Int Ed Engl. 2023 Jul 18:e202307812. doi: 10.1002/anie.202307812. Online ahead of print.ABSTRACTCatalytic enantioselective intermolecular C-H silylation offers an efficient approach for the rapid construction of chiral organosilicon compounds, but remains a significant challenge. Herein, a new type of chiral silyl ligand is developed, which enables the first iridium-catalyzed atroposelective intermolecular C-H silylation reaction of 2-arylisoquinolines. This protocol features mild reaction conditions, high atom economy, and remarkable yield with excellent stereoselectivity (up to 99% yield, 99% ee), delivering e...
Source: Angewandte Chemie - July 18, 2023 Category: Chemistry Authors: Bo Yang Jihui Gao Xingfa Tan Yicong Ge Chuan He Source Type: research
Closed-loop Recycling of Vinylogous Urethane Vitrimers
Angew Chem Int Ed Engl. 2023 Jul 13:e202306188. doi: 10.1002/anie.202306188. Online ahead of print.ABSTRACTDevising energy-efficient strategies for the depolymerization of plastics and the recovery of their structural components in high yield and purity is key to a circular plastics economy. Here, we report a case study in which we demonstrate that vinylogous urethane (VU) vitrimers synthesized from bis-polyethylene glycol acetoacetates (aPEG) and tris(2-aminoethyl)amine can be degraded by water at moderate temperature with almost quantitative recovery (~98%) of aPEG. The rate of depolymerization can be controlled by the t...
Source: Angewandte Chemie - July 13, 2023 Category: Chemistry Authors: Youwei Ma Xuesong Jiang Zixing Shi Jos é Augusto Berrocal Christoph Weder Source Type: research
Electrochemical Activation of Nitromethane to Construct Isoxazoline Aldoximes
Angew Chem Int Ed Engl. 2023 Jun 20:e202304434. doi: 10.1002/anie.202304434. Online ahead of print.ABSTRACTActivating the nitromethane to endow new reactivity is an intersesting and meaningful but challenging topic. Herein, we report an electrochemical activation of nitromethane to serve as both heterocyclic skeleton and oxime sources for the construction of isoxazoline aldoximes. The isoxazoline aldoximes that prepared by four steps with reported strategy are synthesized in a single step from low-cost and readily available nitromethane and olefins with moderate to excellent yields under our electrochemical conditions. The...
Source: Angewandte Chemie - June 21, 2023 Category: Chemistry Authors: Shuaiyu Ji Lixing Zhao Bingyang Miao Meng Xue Tao Pan Zhichao Shao Xin Zhou Aiping Fu Yuexia Zhang Source Type: research
