Results 71 to 80 of about 27,574 (257)

Phenolic Profile and Bioactive Prospects of Wild Annona Species From Angola

Chemistry &Biodiversity, EarlyView.
ABSTRACT Annona species (Annonaceae family) are valued for their nutritional and medicinal importance, especially in traditional medicine. This study investigated the phenolic profiles of the Angolan Annona muricata, Annona squamosa, and Annona senegalensis leaves, stem barks, and seeds hydroethanolic, infusion, and decoction extracts, also evaluating ...
Josefa Rangel, Ângela Liberal, Tiane C. Finimundy, Tânia S. P. Pires, Pedro Cravo, Maria Conceição Silva, Gustavo Capatti Cassiano, Lillian Barros, Maria M. Romeiras, Ângela Fernandes   +9 more
wiley   +1 more source

Synthesis and Photophysical Characterization of Axially Functionalized Silicon(IV) Naphthalocyanines with Phototheranostic Potential

ChemistryEurope, EarlyView.
In this study, the synthesis and detailed photophysical characterization of SiNcs functionalized with structurally diverse axial ligands designed to enhance solubility and evaluate photophysical properties are reported. The lead compound, SiNc 3‐PP, demonstrates photothermal conversion efficiency of 62.1% and pronounced photoacoustic contrast at 810 nm,
Pedro M. R. Santos, Benjamin Proto, Debalina Mondal, Alicia Voge, Christine Hoskin, Hanyi Weng, Inês R. M. Santos, Kevin Stamplecoskie, João P. C. Tomé, Juan Chen, Nahyun Kwon, Gang Zheng   +11 more
wiley   +1 more source

Introducing the Cis‐2,3‐Bis(trifluoromethyl)cyclopropyl Chemotype: Late‐Stage Installation and Stereoelectronic Properties

ChemistryEurope, EarlyView.
The cis‐2,3‐bis(trifluoromethyl)cyclopropyl chemotype is introduced. The steric demand of this motif is intermediate between that of the heptafluoroisopropyl and prefluorotertbutyl groups; yet, it induces significantly less lipophilicity than these due to its facial polarity.
Daniel Gaviña, Zeyu Feng, David Herrero, Martin Simon, Christopher Golz, Manuel Alcarazo   +5 more
wiley   +1 more source

High-level Computational Study of the Site-, Facial- and Stereoselectivities for the Diels-Alder Reaction Between o-Benzoquinone and Norbornadiene

Molecules, 2000
Ab initio and DFT quantum chemical calculations have been applied to a study of the Diels-Alder reaction of o-benzoquinone as diene and norbornadiene as dienophile.
Ronald N. Warrener, Martin R. Johnston, Davor Margetic   +2 more
doaj   +1 more source

Synthesis and Isolation of Bismuth Scorpionate Complexes: Toward Bond Activation via Bismuth‐Ligand Cooperation

Chemistry – A European Journal, EarlyView.
ABSTRACT Over the past twenty years, main group chemistry has significantly expanded its scope to include reactivities once considered the exclusive domain of transition metals. Among the emerging concepts, element‐ligand cooperation has proven to be a powerful strategy for enabling bond activation reactions but remains relatively unexplored for ...
Lennart Hensle, Viktoria H. Gessner
wiley   +1 more source

Dual‐Mode Thio‐MacMillan Organocatalysts: Stereoselective Diels–Alder Reactions or Sacrificial Self‐Cyclization to N‐Bridged Bicyclic Lactams

Chemistry – A European Journal, EarlyView.
The study of the Diels–Alder reaction of cinnamaldehyde and cyclopentadiene, catalyzed by chiral imidazolidine‐4‐thiones, led to the discovery of a highly regio‐ and stereoselective Michael‐addition and consecutive ring closure. Here, the imidazolidine‐4‐thione not only catalytically activates cinnamaldehyde but also participates as the nucleophile to ...
Marian S. R. Ebeling, Luca V. Parziale, Marc Sachsenhauser, Christoph J. B. Seifert, Nathalie J. Kurrle, Oliver Trapp   +5 more
wiley   +1 more source

One‐Pot Transition‐Metal‐Free Methods for the Synthesis of All Three Bonds of the Alkyne's Triple Bond

Chemistry – A European Journal, EarlyView.
One‐pot transition‐metal‐free methods for the synthesis of all three bonds of the alkyne's triple bond are reviewed. After analysis of several named reactions and discussion of improvements, recent advances in the synthesis of alkynes are discussed. Each section contains a proposed reaction mechanism and analysis of the strengths and weaknesses of the ...
Eugene Kim, Yu Wu, Judith N. Currano, Jianyou Mao, Patrick J. Walsh   +4 more
wiley   +1 more source

Expanding the scope of cyclopropene reporters for the detection of metabolically engineered glycoproteins by Diels–Alder reactions

Beilstein Journal of Organic Chemistry, 2014
Monitoring glycoconjugates has been tremendously facilitated by the development of metabolic oligosaccharide engineering. Recently, the inverse-electron-demand Diels–Alder reaction between methylcyclopropene tags and tetrazines has become a popular ...
Anne-Katrin Späte, Verena F. Schart, Julia Häfner, Andrea Niederwieser, Thomas U. Mayer, Valentin Wittmann   +5 more
doaj   +1 more source

Machine Learning to Predict Diels–Alder Reaction Barriers from the Reactant State Electron Density [PDF]

, 2021
Santiago Vargas, Matthew R. Hennefarth, Z. J. Liu, Anastassia N. Alexandrova   +3 more
openalex   +1 more source

Dynamic Covalent Chemistry Enables Self‐Healing and Compatibilization in Polypropylene Composites

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A high‐performance polypropylene insulation material is created through dynamic covalent crosslinking. It achieves exceptional dielectric properties, autonomous self‐healing, and easy recycling, offering a sustainable solution for future HVDC transmission systems.
Hongzhe Zhang, Wenye Zhang, Wenjie Huang, Jun‐Wei Zha   +3 more
wiley   +1 more source