Results 31 to 40 of about 24,276 (294)
Tungsten-Promoted Intramolecular Alkoxycarbonylation for Synthesis of Complex Oxygenated Molecules
, 2016 Intramolecular alkoxycarbonylation of tungsten−propargyl compounds proceeds with excellent diastereoselectivities to form η3-δ- and -ε-lactones but for γ-lactones.
Shie-Ming Peng (1425703) +6 more
core +1 more source
, 2016 Metal carbonyl salts CpW(CO)3Na, Re(CO)5Na, and CpFe(CO)2Na were used for intramolecular cyclization of 1-(3-bromo-1-propynyl)-2-(3-oxopropyl)benzene. Among these salts, CpW(CO)3Na was found to be the most effective in yielding a metalated fused η1-2,5 ...
Shie-Ming Peng (1425703) +5 more
core +2 more sources
Advanced Engineering Materials, EarlyView.This study demonstrates an efficient recycling route for out‐of‐spec AlSi10Mg atomized powders through compaction and arc remelting followed by suction casting. By correlating compaction load, cooling rate, and resulting microstructure, we show that intermediate pressures (50–80 kN) and rapid cooling refine dendrites, reduce porosity, and enhance ...
Mila Christy de Oliveira +4 more
wiley +1 more source
Synthesis and reactivity studies on oxo and sulphide compounds of the early transition metals [PDF]
, 1989 This thesis describes studies directed towards the preparation of new oxo compounds of the early transition metals with a view to delineating some of the complex factors which govern their stability and reactivity.
Shaw, Alan
core
, 2016 The reaction of CpW(CO)3Na with a number of propargyl bromides with tethered aldehydes and ketones afforded η1-propargyl species that were subsequently transformed into tungsten−η3-2-(methoxycarbonyl)allyl compounds upon treatment with p-TSA/CH3OH; the ...
Chi-Chung Chen (633399) +2 more
core +1 more source
Frontiers in Chemistry, 2022 Photocatalytic nitrogen reduction reaction (NRR) to ammonia holds a great promise for substituting the traditional energy-intensive Haber–Bosch process, which entails sunlight as an inexhaustible resource and water as a hydrogen source under mild ...
Xiangchao Hui +4 more
doaj +1 more source
Influence of an Argon/Silane Atmosphere on the Temperature of a Thermal Plasma
Advanced Engineering Materials, EarlyView.The influence of a silane‐doped argon atmosphere on the chemical composition and temperature of a thermal nontransferring argon plasma is investigated using optical emission spectroscopy. As a result of the high amount of free electrons resulting from the stepwise ionization and dissociation of the silane molecule, even a silane addition of 0.01 vol ...
Lena Kreie +4 more
wiley +1 more source
Bond Valence Sum Parameters for Analyzing Pyranopterin Tungsten Enzyme Structures
MoleculesThe determination of tungsten oxidation states and W–ligand bond lengths for pyranopterin tungsten enzymes can be negatively impacted by Fourier series termination effects and photodamage/photoreduction in the X-ray beam.
Jesse Lepluart, Martin L. Kirk
doaj +1 more source
Tungstoenzymes: Occurrence, Catalytic Diversity and Cofactor Synthesis
Inorganics, 2020 Tungsten is the heaviest element used in biological systems. It occurs in the active sites of several bacterial or archaeal enzymes and is ligated to an organic cofactor (metallopterin or metal binding pterin; MPT) which is referred to as tungsten ...
Carola S. Seelmann +3 more
doaj +1 more source
A Knowledge‐Based Approach for Understanding and Managing Additive Manufacturing Data
Advanced Engineering Materials, EarlyView.Additive manufacturing processes generate a large amount of data. Effectively managing, understanding, and retrieving information from this data remains a major challenge. Therefore, we propose an ontology‐based approach to integrate heterogeneous data, enable semantic queries, and support decision‐making.
Mina Abd Nikooie Pour +5 more
wiley +1 more source