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chauffage à reflux

reflux

chimie - iate.europa.eu

Le peroxyacide de tungstène intermédiaire est estérifié par chauffage à reflux avec de l'alcool de façon à produire une solution de précurseur comprenant des dérivés péroxyester de tungstène.

The intermediate tungsten peroxy acid is esterified by heating under reflux with alcohol to produce a precursor solution including peroxyester tungsten derivatives.

chimie - wipo.int

Après chauffage à reflux, on refroidit les échantillons, qui sont automatiquement titrés avec une solution de sulfate de fer et d’ammonium pour déterminer l'excès d'agent oxydant.

After refluxing, the samples are cooled and are automatically titrated with iron-ammonium-sulfate to determine the excess of oxidizing agent.

général - CCMatrix (Wikipedia + CommonCrawl)

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A simple and convenient method for the hydrolysis of styrene-maleic anhydride copolymers to styrene-maleic acid copolymers... This hydrolysis reaction is traditionally performed under rather cumbersome reflux conditions....

chimie / sciences naturelles et appliquées - core.ac.uk - PDF: www.loc.gov

Synthesis and application of quaternized polyvinylpyridine supported dichromate as a new polymeric oxidizing agent... With this oxidant the oxidation of thiols to disulphides, hydroquinones to quinones, acyloins and allylic alcohols to the corresponding carbonyl compounds, have also been investigated under reflux condition....

PDF: journal.ippi.ac.ir

Synthesis and pharmacological activities of n-(3-hydroxyphenyl)benzamide and its 3-o-derivatives... From this parent molecule 3, various 3-O-derivatives, 5a-f, were prepared via O-alkylation, by reacting it with different alkyl halides, 4a-f, for 2 h under reflux conditions in the presence of mixture of Na-ethoxide and C2H5OH as solvent....

PDF: doaj.org

Optimization of carvacrol, rosmarinic, oleanolic and ursolic acid extraction from oregano herbs (origanum onites l., origanum vulgare spp. hirtum and origanum vulgare l.)... Various extraction methods (ultrasound-assisted, heat-reflux, continuous stirring, maceration, percolation) and extraction conditions (different solvent, material:solvent ratio, extraction temperature, extraction time) were used,...

PDF: figshare.com

Publications scientifiques

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A novel three component synthesis of 2-amino-4h-chromenes derivatives using nano zno catalyst... Also, ZnO nano particles have been characterized by XRD, SEM and TEM and then we report a simple and efficient method for the synthesis of 2-amino-4H-chromenes derivatives by aldehyde, malononitrile and dimedone by using ZnO nanoparticles under reflux in ethanol (Scheme 1) the products are been characterized by CHN, GC/MS, IR and 1H NMR spectroscopy

métallurgie et sidérurgie / chimie - core.ac.uk - PDF: doaj.org