Subj : Highly efficient ruthenium-based catalys To : All From : ScienceDaily Date : Tue Jul 11 2023 22:30:30 Highly efficient ruthenium-based catalysts with caffeine and theophylline Date: July 11, 2023 Source: University of Liege Summary: Researchers are developing highly efficient biosourced catalysts based on caffeine and theophylline, two natural substances. Facebook Twitter Pinterest LinkedIN Email ========================================================================== FULL STORY ========================================================================== A study by Lionel Delaude and Franc,ois Mazars, researchers from the Laboratory of Catalysis at the University of Lie`ge (Belgium), has shown that caffeine and theophylline can be used to 'green' catalysts based on ruthenium. This chemical element belongs to the transition metals. The results of this study have been published in the scientific journal Organometallics and will remainin open access for six months. Catalysts are ubiquitous in chemical processes because they enable reactions to be carried out faster and more selectively under milder experimental conditions. They are generally obtained from non-renewable raw materials, often derived from petrochemicals and metallurgy. In line with the twelve principles of "green chemistry," chemists are now seeking to reduce the carbon footprint of their processes as much as possible. In this context, the team from the Laboratory of Organometallic Chemistry and Homogeneous Catalysis at the University of Lie`ge has developed biobased catalysts derived from caffeine and theophylline, two natural substances from the xanthine family found in large quantities in coffee beans, tea leaves, and cocoa beans. The whole process of adding value to these compounds is environmentally friendly, since their extraction and separation from renewable plant sources requires only water and supercritical CO2 ,"explains Lionel Delaude, professor of chemistry and director of the laboratory. What's more, they are under-exploited and available at low cost. Slight modifications to the chemical structure of xanthines can be used to synthesize N-heterocyclic carbene precursors, which form the basis of many catalysts in the 21st century. The work of Lionel Delaude and his doctoral student Franc,ois Mazars has shown that the combination of a para-cymene ligand derived from a-phellandrene (an essential oil found in many plants, including dill and eucalyptus) and an N-heterocyclic carbene ligand derived from caffeine or theophylline with ruthenium (a low-toxicity metal from the iron family) leads to the formation of highly effective catalysts for promoting three major types of organic reaction, namely, the transfer hydrogenation of unsaturated substrates with isopropanol, the oxidation of alkenes with sodium periodate, and the synthesis of vinyl esters from 1-hexyne and benzoic acid. This discovery contributes to developing more sustainable and environmentally friendly organometallic chemistry. Moreover, it opens the door to other catalytic applications using caffeine and theophylline to generate bio sourced N-heterocyclic carbenes. This publication in Organometallicshas been singled out by the editors of the American Chemical Society to be highlighted on the day of its publication (28 May 2023) and to remain in open access for six months as part of the ACS Editors' Choice programme. It has also been selected to appear on the cover of an issue of the journal (July 10 2023). * RELATED_TOPICS o Plants_&_Animals # Food # Agriculture_and_Food # Biology # Botany o Matter_&_Energy # Chemistry # Organic_Chemistry # Inorganic_Chemistry # Biochemistry * RELATED_TERMS o Caffeine o Natural_gas o Botulinum_toxin_(cosmetic_treatment) o Conservation_ethic o Plastic o Redox o Science o Hydroponics ========================================================================== Print Email Share ========================================================================== ****** 1 ****** ***** 2 ***** **** 3 **** *** 4 *** ** 5 ** Breaking this hour ========================================================================== * Revolutionary_Electric_Artificial_Muscles * Age_of_Universe:_26.7,_Not_13.7,_Billion_Years * City_Ground_Is_Deforming:_Buildings_Aren't_Ready * The_Sound_of_Silence?_People_Hear_It * 36-Million-Year_Geological_Cycle_Drives_... * Six_Foods_to_Boost_Cardiovascular_Health * Cystic_Fibrosis:_Lasting_Improvement * Artificial_Cells_Demonstrate_That_'Life_... * Advice_to_Limit_High-Fat_Dairy_Foods_Challenged * First_Snapshots_of_Fermion_Pairs Trending Topics this week ========================================================================== SPACE_&_TIME NASA Space_Missions Asteroids,_Comets_and_Meteors MATTER_&_ENERGY Nature_of_Water Materials_Science Civil_Engineering COMPUTERS_&_MATH Artificial_Intelligence Neural_Interfaces Computers_and_Internet ========================================================================== Strange & Offbeat ========================================================================== SPACE_&_TIME Reinventing_Cosmology:_New_Research_Puts_Age_of_Universe_at_26.7_--_Not_13.7_- -_Billion_Years Quasar_'Clocks'_Show_Universe_Was_Five_Times_Slower_Soon_After_the_Big_Bang First_'Ghost_Particle'_Image_of_Milky_Way MATTER_&_ENERGY Revolutionary_Self-Sensing_Electric_Artificial_Muscles Bees_Make_Decisions_Better_and_Faster_Than_We_Do,_for_the_Things_That_Matter_to Them These_Lollipops_Could_'Sweeten'_Diagnostic_Testing_for_Kids_and_Adults_Alike COMPUTERS_&_MATH Number_Cruncher_Calculates_Whether_Whales_Are_Acting_Weirdly AI_Tests_Into_Top_1%_for_Original_Creative_Thinking Researchers_Create_Highly_Conductive_Metallic_Gel_for_3D_Printing Story Source: Materials provided by University_of_Liege. Note: Content may be edited for style and length. ========================================================================== Journal Reference: 1. Franc,ois Mazars, Lionel Delaude. "Greening" Ruthenium-Arene Catalyst Precursors with N-Heterocyclic Carbene Ligands Derived from Caffeine and Theophylline. Organometallics, 2023; 42 (13): 1589 DOI: 10.1021/ acs.organomet.3c00166 ========================================================================== Link to news story: https://www.sciencedaily.com/releases/2023/07/230711130745.htm --- up 1 year, 19 weeks, 1 day, 10 hours, 50 minutes * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (1:317/3) .