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Influence of Asymmetrical Ligand Substitution on the Formation, Stability, and Reactivity of Ruthenium(III)-Hypochlorite Complexes.
Chemistry
January 2025
Manchester Interdisciplinary Biocentre: The University of Manchester Manchester Institute of Biotechnology, Biotechnology and chemical engineering, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND.
Hypohalites are commonly generated in biological systems, mostly with functions related to defense and immune system response. These hypohalites can bind to metal centers and are known for their strong oxidizing properties that play crucial roles in various biological processes. Herein, we report the synthesis, characterization and reactivity of novel biomimetic Ru(III)-hypochlorite complexes and focus the work on the electronic effects associated with the incorporation of methyl groups in a pentadentate ligand framework in an asymmetric fashion.
View Article and Find Full Text PDFCobalt-Catalyzed Enantioselective Reductive Coupling of Imines and Internal Alkynes.
Angew Chem Int Ed Engl
January 2025
IISER Kolkata: Indian Institute of Science Education and Research Kolkata, Department of Chemical Sciences, Mohanpur, 741246, Nadia, INDIA.
Chiral allyl amines are important structural components in natural products, pharmaceuticals, and chiral catalysts. Herein, we report a cobalt-catalyzed enantioselective reductive coupling of imines with internal alkynes to synthesize chiral allyl amines. The reaction is catalyzed by a cobalt complex derived from commercially available bisphosphine ligand utilizing zinc as the electron donor.
View Article and Find Full Text PDFInvestigating the Role of Aniline Structure in Improving Proton Exchange Membranes for High Conductivity.
Macromol Rapid Commun
January 2025
College of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, 450001, P. R. China.
Polybenzothiazole exhibits high proton conductivity; however, its rigid backbone limits its applicability, necessitating processes such as modification or doping. The aniline structure can participate in various reactions, including nucleophilic or electrophilic substitution reactions, salt formation, and acylation reactions. In this experiment, an aniline structure is integrated into the main chain of sulfonated polybenzothiazole to investigate the potential of aniline for enhancing proton exchange membranes.
View Article and Find Full Text PDFOne Step Synthesis of 4,6,8-Trimethoxyazulenes - a General Building Block for 2-Functionalized Azulenes.
Chemistry
January 2025
Ruprecht Karls Universitat Heidelberg, Organisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120, Heidelberg, GERMANY.
Here we present a simple gold-catalyzed one-pot reaction of easily available diarylbutadiynes, with trimethoxybenzene as solvent and reactant to synthesize 4,6,8-trimethoxyazulenes. The methoxy substituents, which render the azulene very electron-rich, enable a change of azulenes typical regioselectivity for electrophilic substitutions, which enables facile electrophilic 2-substitution with iodine, bromine, chlorine, selenium or sulfur. Especially the 2-haloazulenes which can usually only be obtained through lengthy multistep syntheses are valuable building blocks for the synthesis of 2-substituted azulene derivatives.
View Article and Find Full Text PDFDiverse reactivity of a cationic N-heterocyclic phosphenium complex towards anionic substrates - substitution reduction.
Dalton Trans
January 2025
Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart, Germany.
Article Synopsis
- A cationic N-heterocyclic phosphenium iron tetracarbonyl complex was synthesized and its reactivity with various anionic reactants was investigated, resulting in different products depending on the anion involved.
- Reactions with fluoride and chloride produced neutral diazaphospholenes, while bromide and iodide led to NHP iron halides through metal addition and decarbonylation.
- At room temperature, the cationic complex primarily reduced to form a detectable Fe-centered radical, whereas at -78 °C, CH-metalation was favored, further evidenced by the characterization of a neutral borane-adduct.
- The complex’s reactivity variations are attributed to its higher electrophilicity compared to neutral complexes
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