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Asymmetric gem-Hydroboration and gem-Hydrogenation of Ynamides: A New Gateway to Chiral Fischer Carbene Complexes and their Catalytic Transformations.
Angew Chem Int Ed Engl
January 2025
Max-Planck-Institut fur Kohlenforschung, Organometallic Chemistry, Kaiser-Wilhelm-Platz 1, 45470, Mülheim/Ruhr, GERMANY.
Ynamides, when reacted with H2 or HBpin in the presence of [Cp*RuCl]4, convert into chiral-at-metal Fischer carbenes by regioselective gem-hydrogenation or gem-hydroboration of the polarized triple bond, respectively. gem-Hydroboration concomitantly affords a carbogenic borylated stereocenter adjacent to the ruthenium carbene unit, the configuration of which can be controlled using an Evans auxiliary. These are the first examples of asymmetric gem-addition reactions to alkynes known in the literature; representative pianostool ruthenium carbene complexes formed by this unconventional route were characterized by crystallographic and spectroscopic means.
View Article and Find Full Text PDFMapping the molecular mechanism of zinc catalyzed Suzuki-Miyaura coupling reaction: a computational study.
Org Biomol Chem
January 2025
Department of Chemistry, CMS College Kottayam (Autonomous), Kottayam, Kerala, 686001, India.
The Suzuki-Miyaura Coupling (SMC) reaction is a powerful method for forming carbon-carbon bonds in organic synthesis. Recent advancements in SMC reactions have introduced first-row transition metal catalysts, with zinc garnering significant interest due to its cost-effective and eco-friendly nature. Despite progress in experimental protocols, the mechanistic details of zinc-catalyzed SMC reactions are limited.
View Article and Find Full Text PDFTwo-dimensional anion-rich NaCl crystal under ambient conditions.
Nat Commun
January 2025
School of Physical Science and Technology, Ningbo University, Ningbo, China.
The two-dimensional (2D) "sandwich" structure composed of a cation plane located between two anion planes, such as anion-rich CrI, VS, VSe, and MnSe, possesses exotic magnetic and electronic structural properties and is expected to be a typical base for next-generation microelectronic, magnetic, and spintronic devices. However, only a few 2D anion-rich "sandwich" materials have been experimentally discovered and fabricated, as they are vastly limited by their conventional stoichiometric ratios and structural stability under ambient conditions. Here, we report a 2D anion-rich NaCl crystal with sandwiched structure confined within graphene oxide membranes with positive surface potential.
View Article and Find Full Text PDFAn Insight into Chip and Surface Texture Shaping Under Finish Turning of Powder Steels Infiltrated with Tin Bronze.
Materials (Basel)
December 2024
Institute of Mechanical Engineering, University of Zielona Gora, 4 Prof. Z. Szafrana Street, 65-516 Zielona Gora, Poland.
The manufacturing of work parts made of powder (sintered) steels is currently widespread in industry, as it provides minimal processing allowances and high dimensional accuracy, as well as the required properties and unconventional chemical composition. At the same time, their low tensile or bending strength must be considered a serious disadvantage. In order to minimize these disadvantages, a number of strengthening technologies are used, among which is the infiltration of porous base materials with metal alloys.
View Article and Find Full Text PDFResponse of Kapok seedlings were irrigated with water of different qualities and heavy metal contents for foliar application of antioxidants.
BMC Plant Biol
January 2025
Horticulture Department, Faculty of Agriculture, Fayoum University, Fayoum, 63514, Egypt.
Background: The imbalance between Egypt's water requirements and supply necessitates the use of unconventional water sources, such as treated sewage water (TSW) and agricultural drainage water (ADW), to combat water scarcity. This study investigated the effects of foliar glycine betaine (GB) on vegetative growth parameters, physiological characteristics, photosynthetic pigments, leaf element contents, anatomical leaf structures, and antioxidant activity. The experiment was conducted in two successive seasons (2021/2022 and 2022/2023) using Kapok seedlings irrigated with ADW and TSW at different mixing ratios with normal irrigation water (NIW) (25%, 50%, 75%, and 100%), combined with foliar spraying of GB at concentrations of 0.
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