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Computational Insights into the Mechanism of Lewis Acid-Catalyzed Alkene-Aldehyde Coupling.
Chempluschem
January 2025
University of Vienna, Faculty of Chemistry, Währinger Str. 17, 1090, Vienna, AUSTRIA.
The Lewis acid-catalyzed coupling of alkenes and aldehydes presents a modern, versatile synthetic alternative to classical carbonyl addition chemistry, offering exceptional regio- and stereoselectivity. In this work, we present a comprehensive computational investigation into the reaction mechanism of this transformation. Our findings confirm the occurrence of an enantioselective trans-annular [1,5]-hydride shift step and demonstrate that the enantioselectivity of the reaction arises predominantly from steric clashes between functional groups in the cyclization step.
View Article and Find Full Text PDFPsycho-physiological foundations of human physical activity behavior and motivation: Theories, systems, mechanisms, evolution, and genetics.
Physiol Rev
January 2025
Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland.
Physical activity is a meaningful part of life, which starts before birth and lasts until death. There are many health benefits to be derived from physical activity, hence, regular engagement is recommended on a weekly basis. However, these recommendations are often not met.
View Article and Find Full Text PDFThe ligninolytic catalytic network reveals the importance of auxiliary enzymes in lignin biocatalysts.
Proc Natl Acad Sci U S A
January 2025
Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People's Republic of China.
Lignin degradation by biocatalysts is a key strategy to develop a plant-based sustainable carbon economy and thus alleviate global climate change. This process involves synergy between ligninases and auxiliary enzymes. However, auxiliary enzymes within secretomes, which are composed of thousands of enzymes, remain enigmatic, although several ligninolytic enzymes have been well characterized.
View Article and Find Full Text PDFRegulating Charge Distribution in Porphyrin-Based Polymer for Achieving Photocatalytic CO Conversion to CH or CH.
Small
January 2025
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, China.
The photocatalytic conversion of CO into products such as CH and CH poses a significant challenge due to the lengthy reaction steps and the high energy barrier involved. In this study, both benzothiadiazole (BTD) and hydroxyl groups (-OH) are introduced into cobalt-based polymerized porphyrinic network (PPN) through a C-C coupling reaction. This modification of orbital energy levels that strengthens the ability of gain electrons and facilitates the charge transfer in PPN.
View Article and Find Full Text PDFCellular uptake and transport mechanism of lycopene-loaded nanomicelles formed by amphiphilic peptide self-assembly in the intestinal epithelium.
J Sci Food Agric
January 2025
School of Food Science and Engineering, Hainan University, Haikou, People's Republic of China.
Background: This study aimed to elucidate the transport mechanism of lycopene-loaded nanomicelles to improve intestinal absorption of lycopene. The interactive mechanism between lycopene and nanomicelles was investigated through isothermal titration calorimetry (ITC). The cytotoxicity, cellular uptake, endocytosis, and intracellular transport pathways of lycopene-loaded nanomicelles were investigated using the Caco-2 cell model.
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