Results 21 to 30 of about 27,691 (270)

Assessing the Role of Carbonyl Adducts, Particularly Malondialdehyde Adducts, in the Development of Dermis Yellowing Occurring during Skin Photoaging

Life, 2022
Solar elastosis is associated with a diffuse yellow hue of the skin. Photoaging is related to lipid peroxidation leading to the formation of carbonyl groups. Protein carbonylation can occur by addition of reactive aldehydes, such as malondialdehyde (MDA),
Hélène Zucchi, Hervé Pageon, Daniel Asselineau, Marion Ghibaudo, Inês Sequeira, Sarah Girardeau-Hubert   +5 more
doaj   +1 more source

Recent advances in the methanol carbonylation reaction into acetic acid

, 2020
Although the high efficiency of the homogeneous processes, using rhodium or iridium complexes, was clearly demonstrated industrially, heterogeneous catalysts offer the advantages of facile product separation and vapor phase operation, which often limit ...
P. Kalck, Carole Le Berre, P. Serp
semanticscholar   +1 more source

Mechanochemistry Meets Catalysis: Metal Complexes for Greener Organic Transformations

Angewandte Chemie, EarlyView.
Mechanochemistry is redefining metal catalysis by controlling catalyst formulation, speciation, and deployment. This Review shows how milling, LAG, RAM, and TSE enable rapid metal‐complex assembly, distinctive catalytic manifolds, and scalable synthesis beyond solution chemistry.
Sourav Behera, Francesco Basoccu, Andrea Porcheddu   +2 more
wiley   +2 more sources

Nature of Amide Carbonyl−Carbonyl Interactions in Proteins

Journal of the American Chemical Society, 2009
Noncovalent interactions define and modulate biomolecular structure, function, and dynamics. In many protein secondary structures, an intimate interaction exists between adjacent carbonyl groups of the main-chain amide bonds. As this short contact contributes to the energetics of protein conformational stability as well as protein-ligand interactions ...
Choudhary, Amit, Gandla, Deepa, Krow, Grant R., Raines, Ronald T.   +3 more
openaire   +2 more sources

Catalytic Functionalization of Unactivated π‐Bonds Enabled by Bidentate Directing Auxiliaries

Angewandte Chemie, EarlyView.
This review explores how bidentate directing auxiliaries have advanced transition‐metal catalysis for unactivated alkene/alkyne functionalization. By leveraging chelated intermediates, bidentate directing auxiliaries enable precise hydrofunctionalization, difunctionalization, and C─H activation of π‐bonds with unique selectivity and reactivity.
Seunghyeon Cho, Al Vicente Riano D. Lisboa, Juntao Sun, Taeho Kang, Keary M. Engle   +4 more
wiley   +2 more sources

Protracted Oxidative Alterations in the Mechanism of Hematopoietic Acute Radiation Syndrome

Antioxidants, 2015
The biological effects of high-dose total body ionizing irradiation [(thereafter, irradiation (IR)] are attributed to primary oxidative breakage of biomolecule targets, mitotic, apoptotic and necrotic cell death in the dose-limiting tissues, clastogenic ...
Nikolai V. Gorbunov, Pushpa Sharma
doaj   +1 more source

Direct δ‐Lactone Synthesis From Free Alcohols via Photoinduced δ‐C(sp3)–H Carbonylation in Flow

Angewandte Chemie, EarlyView.
Herein, we have developed a photo‐flow platform for the δ‐C(sp3)─H carbonylative lactonization of free alcohols with carbon monoxide. The transformation integrates alkoxyl radical generation, selective 1,5‐HAT, CO incorporation, and radical–polar crossover to enable direct access to δ‐lactones from simple alcohol precursors.
Prakash Chandra Tiwari, Runkang Liu, Timothy Noël   +2 more
wiley   +2 more sources

Protein Carbonylation and Aggregation Precede Neuronal Apoptosis Induced by Partial Glutathione Depletion

ASN Neuro, 2012
While the build-up of oxidized proteins within cells is believed to be toxic, there is currently no evidence linking protein carbonylation and cell death.
Anushka Dasgupta, Jianzheng Zheng, Oscar A. Bizzozero   +2 more
doaj   +1 more source

Single‐Atom Iron‐Catalyzed Oxidative Esterification: From Methylarenes to the Upcycling of Polystyrene and Lignin‐Derived Feedstocks

Angewandte Chemie, EarlyView.
Heterogeneous iron‐catalyzed environmentally benign and sustainable CH‐oxidative esterification methodology has been developed for the synthesis of esters. This challenging reaction has been achieved by the rational design of specific single atom iron‐based catalyst with Fe‐N4 active centers, which empowered the oxidative esterification of methyl and ...
Zhuang Ma, Binyu Zhang, Hui Yang, Yue Hu, Junzheng Yu, Yanbin Cui, Jun Zhao, Matthias Beller, Rajenahally V. Jagadeesh   +8 more
wiley   +2 more sources

Computer Vision Enables Monitoring and Kinetic Analysis of Structurally Diverse Carbon Monoxide Surrogates

Angewandte Chemie, EarlyView.
A non‐contact computer vision method enables monitoring and quantitative comparison of vessel‐specific CO release kinetics from structurally diverse surrogates in two‐chamber COware reactors, revealing that surrogate reactivity scores correlate with carbonylation reaction outcomes.
Kristin Donnachie, Ciaran Griffin, Morven L. Gray, Timothy J. D. McCabe, Marc Reid   +4 more
wiley   +2 more sources