Results 81 to 90 of about 16,148 (267)

Atroposelective Access to π‐Conjugated 1,2‐Azaborepines Enabled by Palladium‐Catalyzed Cyclization of N‐Heterobiaryls with Alkynylboronates

Advanced Science, EarlyView.
We report a palladium‐catalyzed atroposelective cyclization of N‐heterobiaryl triflates with alkynyl boronates to access seven‐membered 1,2‐BN‐bridged biaryls with high yields and excellent enantioselectivity via a cascade DyKAT, cis‐carbopalladation, and 1,2‐migration, which expands the toolbox for axially chiral π‐conjugated boron compounds and opens
Fengya He, Zhen Wang, Haoyu Guo, Shuguang Chen, Xu Zhang, Yongjia Shang, Hui Wang   +6 more
wiley   +1 more source

Three Component Thio‐ and Carboboration of Alkynes: A Modular Route to Functionalised Bicyclic Boronates

Angewandte Chemie, EarlyView.
Three‐component thio‐ and carbo‐boration reactions to form functionalised benzoxaborinines and benzazaborinines are reported. The nucleophile scope includes thioethers, thiols, and (hetero)arenes. Mechanistic studies revealed a disparity between thioboration using thioethers and using thiols.
Laura Winfrey, Gary S. Nichol, Stephen P. Thomas, Dominic R. Willcox, Michael. J. Ingleson   +4 more
wiley   +2 more sources

Fabrication of Composite Cathode for All‐Solid‐State Sodium Batteries

Advanced Energy Materials, EarlyView.
The design of composite cathodes for all‐solid‐state sodium batteries must address three critical challenges—interfacial side reactions, interfacial delamination, and highly tortuous transport pathways. This work outlines structural and interfacial strategies to optimize ion transport and mechanical stability, enabling durable, and high‐performance ...
Gaoming Sun, Yuan Ma, Hehe Zhang, Shengan Wu, Shiyong Chu, Stefano Passerini, Yanjiao Ma   +6 more
wiley   +1 more source

Functional and Network PHAs via Stereoselective Polymerization and Tailored Post‐Transformation

Angewandte Chemie, EarlyView.
Catalyst‐controlled stereoselective (co)polymerization of functionalized lactones produces vinyl‐, allyl‐, and propargyl‐functionalized PHAs with high syndiotacticity and a broad applicable temperature window, which can be further transformed into crosslinked PHA thermosets, elastic supramolecular networks, and functional grafts. ABSTRACT Incorporation
Ruirui Li, Yingluo Zhao, Jun‐Jie Tian, Ethan C. Quinn, Yunpeng Gao, Maëlle T. Gace, Eugene Y.‐X. Chen   +6 more
wiley   +2 more sources

Validation of Boron Analytical Methods on Standard Reference Material Tomato Leaves from NIST No. 1573a with Isothermal Distillation by UV-Vis Spectrophotometry

Kovalen: Jurnal Riset Kimia, 2022
Boron analysis by UV-Vis spectrophotometry has been developed through distilling triethoxy borane into the curcumin solution. In the distillation of ester borane, an esterification reaction occurs between borate and ethanol.
Isna Lailatusholihah, Roto, Agus Kuncaka, Ninik Triayu Susparini   +3 more
doaj   +1 more source

From Materials to Systems: Challenges and Solutions for Fast‐Charge/Discharge Na‐Ion Batteries

Advanced Energy Materials, EarlyView.
This review systematically analyzes the key characteristics limiting the fast‐charge/discharge capability of Na‐ion batteries (SIBs) from a multi‐scale perspective encompassing electrode materials, the electrode‐electrolyte interface, and the system. Furthermore, it presents practical solution strategies for the fundamental issues arising at each scale,
Bonyoung Ku, Sangbin Park, Sunha Hwang, Sunghyun Lim, Won‐Sub Yoon, Jongsoon Kim   +5 more
wiley   +1 more source

Metal‐free Hydrogen Generation from Seawater and Silicon Waste: A Circular Approach

Angewandte Chemie, EarlyView.
Hydrogen was rapidly generated directly from untreated seawater and polymeric Si waste without any transition metal catalyst. The in situ generated polymeric cross‐linked Si resin was completely depolymerized under mild conditions into chloro‐silane monomers.
Mustapha Hamdaoui, Anja Steinmaurer, Philipp Jernej, Daniel Legenstein, Peter Hartmann, Adrian Daniel Boese, Katalin Barta   +6 more
wiley   +2 more sources

Ring‐opening metathesis polymerization‐Derived Organoborane Polymers as Strong Lewis Acids and Luminescent Materials

ChemistryEurope
Decoration of polymers with Lewis acidic borane moieties is attractive as it enables the development of functional materials for use as powerful supported catalysts, chemical sensors, and building blocks of novel supramolecular materials.
James McQuade, Fernando Vidal, Mah Noor, Lakshita Anand, Roger A. Lalancette, Frieder Jäkle   +5 more
doaj   +1 more source

Unexpected Activation of Ethers and Polysiloxanes by a Phosphine-Borane-Stabilized 1,3-Dicarbanion/Butyllithium Couple

, 2019
The reaction between the tertiary phosphine-borane PhP­(BH3)­(CH2Ph)2 (6) and 1 equiv of nBuLi, PhCH2Na, or PhCH2K gives the monodeprotonation products [PhP­(BH3)­(CHPh)­(CH2Ph)]­MLn (MLn = Li­(OEt2)0.25 (7), Na­(THF)0.5 (8), K­(OEt2)0.5 (9)). Similarly,
Atheer M. Madlool (6860519), Keith Izod (1580347), Paul G. Waddell (1580350)   +2 more
core   +1 more source

Stereoselective Synthesis of 8-Trialkylstannylmenthols

Molecules, 2000
Trialkyltin menthones of type 2 are obtained selectively by 1,4-addition of trialkylstannyl lithium to (-)-pulegone. Reduction of 2 with borane in THF using as catalyst the reagent prepared from borane and (S)-valinol gave a mixture of the corresponding ...
Julio C. Podestá, Verónica Dodero, Nelda N. Giagante, Sandra D. Mandolesi   +3 more
doaj   +1 more source