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Electrochemically Driven Selective Olefin Epoxidation by Cobalt-TAML Catalyst.
J Am Chem Soc
January 2025
Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, South Korea.
Epoxides are versatile chemical intermediates that are used in the manufacture of diversified industrial products. For decades, thermochemical conversion has long been employed as the primary synthetic route. However, it has several drawbacks, such as harsh and explosive operating conditions, as well as a significant greenhouse gas emissions problem.
View Article and Find Full Text PDFRuthenium-Catalyzed Intramolecular Allene-alkyne Cascade Cyclization: Access to the Sulfone-cyclopenta[]naphthalene Core.
Org Lett
January 2025
Department of Chemistry, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India.
A ruthenium-catalyzed intramolecular cascade cyclization of allene-alkyne has been achieved. This method offers a streamlined and atom-economical approach for the construction of sulfone bearing 1-cyclopenta[]naphthalenes, an important structural scaffold that exists in biologically active compounds. Our approach, backed by mechanistic insights from deuterium labeling, DFT calculations, and potential for reaction scale-up, presents synthetic chemists with an invaluable tool for efficiently producing a distinct carbon framework in a one-pot manner.
View Article and Find Full Text PDFSelective Depolymerization for Sculpting Polymethacrylate Molecular Weight Distributions.
J Am Chem Soc
January 2025
George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States.
Chain-end reactivation of polymethacrylates generated by reversible-deactivation radical polymerization (RDRP) has emerged as a powerful tool for triggering depolymerization at significantly milder temperatures than those traditionally employed. In this study, we demonstrate how the facile depolymerization of poly(butyl methacrylate) (PBMA) can be leveraged to selectively skew the molecular weight distribution (MWD) and predictably alter the viscoelastic properties of blended PBMA mixtures. By mixing polymers with thermally active chain ends with polymers of different molecular weights and inactive chain ends, the MWD of the blends can be skewed to be high or low by selective depolymerization.
View Article and Find Full Text PDFConstructing well-dispersed active phase spontaneous redox for electrochemical nitrate reduction to ammonia.
Chem Commun (Camb)
January 2025
Graphene Composite Research Center, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
In this study, a distinctive multiple core-shell structure of Co nanoparticles inserted into N-doped carbon dodecahedron@Co hydroxide (Co/NCD@Co(OH)) was synthesized a spontaneous redox reaction between metallic Co and NO, ultimately materializing the fine dispersion and exposure of the active sites. The electronic interaction existing between the Co/NCD core and the Co(OH) shell brings a synergistic effect, conspicuously lessens the overpotential, and reinforces the yield-rate and faradaic efficiency of NH for electrochemical nitrate-ammonia conversion. This study underlines the spontaneous redox between the catalysts and substrate, rendering it as a synthetic strategy for designing genuine and well-dispersed active sites.
View Article and Find Full Text PDFExploring Pyridine-Based Schemes: A Comprehensive Review on their Synthesis and Therapeutic Applications.
Med Chem
January 2025
Department of Pharmacy, BGC Trust University Bangladesh, Chittagong 4381, Bangladesh.
Pyridine and its derivatives are six-membered aromatic rings containing nitrogen, which are abundant in nature and indispensable in studying heterocyclic chemistry. They constitute significant chemical substances with numerous applications. The application of pyridine derivatives by incorporating metals in modern medicine is growing in relevance.
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