نتایج جستجو برای: acid chlorides
تعداد نتایج: 750051 فیلتر نتایج به سال:
This work investigates the potential of magnetic Fe3O4 nanoparticles as an adsorbent for separation and preconcentration of trace amounts of mefenamic acid in aquatic and biological samples, prior to spectrophotometric determination. The magnetic iron oxide nanoparticles (MIONs) were synthesized by mixing of ferrous and ferric chlorides. The possible parameters affecting the enrichment were opt...
Alkylation of pyrazine-2-carboxylic acid and 6-chloropyrazine-2-carboxylic acid with radicals generated by silver nitrate-catalyzed oxidative decarboxylation of pivalic acid afforded 5-(1,1dimethylethyl)pyrazine-2-carboxylic acid and 6-chloro-5-(l,l-dimethylethyl)pyrazine-2-carboxylic acid. Condensation of chlorides of the latter three halogenated and/or alkylated pyrazine-2carboxylic acids wit...
Herein, novel hybrid compounds of celecoxib and 2-aminoanthraquinone derivatives have been synthesized using condensation reactions of celecoxib with 2-aminoanthraquinone derivatives or 2-aminoanthraquinon with celecoxib derivatives. Celecoxib was reacted with different acid chlorides, 2-chloroethylisocyanate and bis (2-chloroethyl) amine hydrochloride. These intermediates were then reacted wit...
In this research, sol-gel bioactive glass in SiO2 �-P2O5 ? CaO - Na2O system using common nitrate precursors was investigated. Some parameters like water/alcohol/TEOS ratio, type of catalyst (acid or alkali) and temperature of heat treatment were also studied. Various precursors such as acetates, carbonates and chlorides were utilized to introduce Ca and Na in glass composition. Characterizatio...
Although the past 15 years have witnessed the development of sterically bulky and electron-rich alkylphosphine ligands for palladium-catalyzed cross-couplings with aryl chlorides, examples of palladium catalysts based on either triarylphosphine or bidentate phosphine ligands for efficient room temperature cross-coupling reactions with unactivated aryl chlorides are rare. Herein we report a pall...
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