Article
Chemistry, Inorganic & Nuclear
Preeti Devi, Ashwani Kumar, Senthilkumar Muthaiah
Summary: A new ruthenium complex with high catalytic activity for the conversion of amines and alcohols into imines and ketones, respectively, was synthesized. The complex exhibited instability in solution but showed promising potential for application in liquid organic hydrogen storage.
INORGANICA CHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Jully Patel, Gabriel Bury, Alireza K. Ravari, Roman Ezhov, Yulia Pushkar
Summary: This study investigates the descriptors correlated with catalytic activity through the synthesis and characterization of two catalysts. The results show that the introduction of an ethoxy group can enhance the catalytic activity in chemically driven and photocatalytic water oxidation, and it is related to the configuration of the Ru-oxo unit.
Article
Chemistry, Multidisciplinary
Dorothee Schindler, Ana-Lucia Meza-Chincha, Maximilian Roth, Frank Wuerthner
Summary: The catalytic activities of di- and tetranuclear Ru(bda) macrocycles in homogeneous water oxidation depend on their size, with the largest tetranuclear catalyst showing the highest efficiency. Turnover frequencies per Ru unit have increased from di- to tetranuclear macrocycles, indicating a clear structure-activity relationship for this novel class of macrocyclic water oxidation catalysts.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Review
Chemistry, Multidisciplinary
Nadim Ayoub, Joumana Toufaily, Erwann Guenin, Gerald Enderlin
Summary: Lignocellulosic feedstocks can be used to generate biofuels and biochemicals, but methods using metal catalysts have some issues. This Review summarizes catalytic methods using metal and metal-free catalysts for oxidation reactions and demonstrates the potential of metal-free catalysts.
Article
Chemistry, Multidisciplinary
Alexandra M. Zima, Oleg Y. Lyakin, Anna A. Bryliakova, Dmitrii E. Babushkin, Konstantin P. Bryliakov, Evgenii P. Talsi
Summary: Catalytic approaches to late-stage creation of new C-O bonds, especially via oxygenation of particular C-H groups in complex organic molecules, provide challenging tools for the synthesis of biologically active compounds and candidate drugs. The key role of the oxygen-transferring high-valent iron-oxygen species in selective oxygenation is now well established. In this Personal Account, recent data on the reactivity of bioinspired formally oxoiron(V) catalytically active sites toward organic substrates having C=C and C(sp(3))-H groups are analyzed, with a focus on the factors governing the oxidation chemo- and stereoselectivity.
Article
Chemistry, Multidisciplinary
Alexandra Walter, Wolfgang Eisenreich, Golo Storch
Summary: This study reports a photochemical approach using flavin catalysts to oxidize silyl enol ethers to α,β-unsaturated ketones. The catalysts exhibit good stability throughout the reaction and can be successfully applied in subsequent aerobic epoxidation reactions. The sequential catalytic activity of flavin enables rapid diversification of substrates.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Multidisciplinary
Xiao Xiao, Kaini Xu, Zhong-Hua Gao, Zhou-Hao Zhu, Changqing Ye, Baoguo Zhao, Sanzhong Luo, Song Ye, Yong-Gui Zhou, Senmiao Xu, Shou-Fei Zhu, Hongli Bao, Wei Sun, Xiaoming Wang, Kuiling Ding
Summary: Enzymes are essential for biological transformations and have attracted great attention for their structures and functions. Biomimetic chemistry has rapidly developed in response to the demand for bioactive molecules and efficient synthesis. Biomimetic asymmetric catalysis, inspired by enzymes, has been recognized as one of the most promising strategies for producing valuable chiral compounds. This review summarizes the evolution of biomimetic asymmetric catalysis in terms of biomimetic design, catalyst development, and catalytic transformations, providing insights into bridging the gap between bio-catalysis and chemical synthesis.
SCIENCE CHINA-CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Jana Hatzfeld, Steffen Skowaisa, Elisabeth Jackel, Julia Kaufmann, Edgar Haak
Summary: Various triaminocyclopentadienyl ruthenium complexes were synthesized from Ru-3(CO)(12) and tested for their ability to catalyze cascade conversions of propargyl alcohols. The substrate scope of catalytic cycloadditions was extended to terpenoid-derived propargyl alcohols containing an internal alkyne moiety, resulting in a wide range of cyclic terpenoid and phloroglucinol adducts obtained by complementary application of both types of catalysts.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Nelly F. Nunheim, Werner R. Thiel
Summary: Systematic optimization of the Ru-catalyzed oxidation of alcohols using TBHP as the oxidizing agent was carried out. A sustainable protocol was developed using a water/tert-butanol mixture as the solvent and a syringe pump for continuous addition of the oxidizing agent, resulting in high yields and selectivity.
Article
Chemistry, Physical
Emmanuel D. Silva, Otavio A. L. Alves, Rogerio T. Ribeiro, Rafael C. R. Chagas, Jose A. F. P. Villar, Jefferson L. Princival
Summary: A new base-and halogen-free homogeneous oxidation system was developed in this study, aiming to selectively oxidize allyl, furyl, aryl, and heteroaryl primary alcohols. The system uses CuCl2/TMEDA/TEMPO with mild reaction conditions to produce aldehydes in high yields, and TMEDA as a ligand significantly affects the redox potential in the system.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Multidisciplinary
Aaron G. Nash, Colton J. Breyer, Brett D. Vincenzini, Gregory I. Elliott, Jens Niklas, Oleg G. Poluektov, Arnold L. Rheingold, Diane K. Smith, Djamaladdin G. Musaev, Douglas B. Grotjahn
Summary: This study reports a catalyst that maintains high electrocatalytic turnover frequency at very low pH values, with high current densities and excellent durability. Preliminary computational studies suggest that the sulfonate group in the active site acts as a proton relay even in strong acid.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Saptashwa Chakraborty, Bijoyananda Mishra, Pratim Kumar Das, Sandip Pasari, Srinivas Hotha
Summary: The silver-assisted gold-catalyzed activation of alkynyl glycosyl carbonate donors is a versatile approach for the synthesis of various types of N-glycosides, including purine and pyrimidine nucleosides, asparagine glycosides, and quinolin-2-one N-glycosides. This method enables the synthesis of nucleosides that are difficult to obtain through other means. Additionally, it can be used to easily synthesize 2'-modified nucleosides and dipeptide disaccharide units of chloroviruses.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Srimanta Manna, Wei-Jun Kong, Jan-E Backvall
Summary: This study presents an iron(II)-catalyzed biomimetic oxidation of N-heterocycles under aerobic conditions, inspired by oxidations in the respiratory chain. The method utilizes environmentally friendly and inexpensive catalysts, delivering important heterocycles in good-to-excellent yields with a broad substrate scope.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Organic
Yadong Li, Pengju Wu, Zhiyong Yang
Summary: An efficient protocol for the synthesis of 2-aryl benzoxazoles via visible light-initiation has been developed. The reaction conditions of this method are mild, and only Eosin Y is needed as photocatalyst without any other metal catalyst. The purification of the desired product is easier because only CO2 is produced as the byproduct. Under the optimal reaction conditions, benzoxazole with different substituents and alpha-keto acids show very good reactivity and a series of arylbenzoxazoles can be synthesized.
CHINESE JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Organic
Steffen Skowaisa, Edgar Haak
Summary: A highly effective catalyst for the alkylation of poorly reactive alcohols with indoles or ketones has been discovered. This catalyst is readily available, stable in air and moisture, and exhibits wide functional group tolerance.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
