11376 multicomponent high speed vibration milling

Home 11376 multicomponent high speed vibration milling

The efficient synthesis of highly substituted pyrroles by multicomponent reaction was developed by Menéndez et al. employing the high-speed vibration milling (Scheme 4.43).In generalized Hantzsch pyrrole synthesis, pyrroles 158 were prepared in a one-pot, two-step reaction, with relatively high yields (illustrative examples, Table 4.14) [29].This reaction involves in the first-step milling of ...


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usually described as high-speed vibration milling (HSVM) or high-speed ball milling (HSBM). The main factors that influence these reactions, besides the obvious ones such as the reaction time and ...


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Europe PMC is an archive of life sciences journal literature. The pseudo-five-component reaction between β-dicarbonyl compounds (2 molecules), diamines and α-iodoketones (2 molecules), prepared in situ from aryl ketones, was performed efficiently under mechanochemical conditions involving high-speed vibration milling with a single zirconium oxide ball.


The use of cryogenic coolants as an alternative cooling technique has been applied widely in recent years because of the many problems associated with conventional cutting fluids. No paper has been published to date on the milling of AZ31 magnesium alloy under dipped cryogenic cooling approach. The comprehensive results from the experimental study have practical importance …


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as high-speed vibration milling (HSVM) or high-speed ball milling (HSBM). The main factors that in uence these reac-tions, besides the obvious ones such as the reaction time and milling frequency, are the type of ball mill, the material of milling balls and jars and the number of balls. In order to increase friction, specially for liquid starting


High sensitivity, high-speed, spectrometers, thermoelectrically cooled detectors, low stray light, 200-1,200nm with a high quantum efficiency Thermoelectric cooled spectrometer, near-infrared range up to 1,700nm, high resolution 1.7nm, high signal to noise ratio >1,500:1, low stray light <1.2% Automated goniometer spectrometers


Concise synthesis of atorvastatin lactone under high-speed vibration milling conditions Verónica Estévez,a Mercedes Villacampaa and J. Carlos Menéndeza* The Hantzsch-type sequential three-component reaction under high-speed vibration milling conditions between 4-methyl-3-oxo-N-phenylpentanamide, tert-butyl 2-[(4R,6R)-6-(2-


A sequential multicomponent process involving the high-speed vibration milling of ketones with N-iodosuccinimide and p-toluenesulfonic acid, followed by addition of a mixture of primary amines, β-dicarbonyl compounds, cerium(IV) ammonium nitrate and silver nitrate afforded polysubstituted, functionalized pyrroles.


Ting-Hu Zhang, Guan-Wu Wang, * Ping Lu, Yu-Jin Li, Ru-Fang Peng, You-Cheng Liu, Yasujiro Murata, and Koichi , " Solvent-free Reactions of C 60 with Active Methylene Compounds Either with or without Carbon Tetrabromide in the Presence of Bases under High-speed Vibration Milling Conditions ", Org. Biomol. Chem. 2004, 2, 1698-1702.


In 2013, we discovered that the reaction could be also performed in a solvent-free fashion, under high-speed vibration milling conditions (HSVM) in a mixer mill working at 20 Hz with the use of a single zirconium oxide ball 20 mm in diameter.


process stability in fairly high speed cutting [1]. Consequently, identification of the chatter oscilla-tions, and their elimination or even stabilization on some low level have become a high interest in science and technology [2-7]. Altintas [2] presented vibration and experimental modal analysis of the machine-tool system in a cutting process.


A sequential multicomponent process involving the high-speed vibration milling of ketones with N-iodosuccinimide and p-toluenesulfonic acid, followed by addition of a mixture of primary amines, β-dicarbonyl compounds, cerium(IV) ammonium nitrate and silver nitrate afforded polysubstituted, functionalized pyrroles.This one-pot, solid-state process can be considered as the coupling of an α ...


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Chatter is a kind of unstable vibration in high-speed milling process, leading to poor surface quality of workpiece, significant tool wear, and severe noise.


The FeCl3-mediated reaction of [60]fullerene with N-benzhydryl sulfonamides afforded C60-fused indane derivatives using the high-speed vibration milling technique. A possible reaction mechanism involving the unprecedented FeCl3-mediated homolytic C–N bond cleavage of N-benzhydryl sulfonamides is proposed. The electrochemistry of the obtained C60-fused indanes was also …


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Vibration-Assisted Grinding Vibration assisted grinding is a grinding method in which a certain frequency of vibration with an amplitude of about 10 µm is superimposed to the cutting tool or the workpiece to achieve better cutting performance. When a high frequency vibration (more than 16 kHz) is applied to the cutting


Empirical models can correlate surface finish, tool vibration, and tool wear to the machining parameters for machining of EN-31 die steel machining with tungsten carbide tool in high-speed machining. Kline et al. [ 1 ] investigated the effects of vibration, deflection, and chatter of the tool workpiece system on roughness in end milling.


Multicomponent mechanochemical synthesis. Feb 28, 2018 Friščić and coworkers demonstrated for the first time the combination of redox and ligand exchange reactions in a multicomponent process.68 Thus, rhenium complexes 68 were obtained from Re 2 (CO) 10, 4,5-phenanthroline and sodium chloride in the presence of oxone, under high-speed vibration milling conditions.


Amphiphilic γ-cyclodextrin–fullerene 2:1 complexes (C L FC H complexes) were prepared by high-speed vibration milling of lipophilic tail-grafted γ-cyclodextrin (γ-CD), hydrophilic tail ...