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تعداد نتایج: 237 فیلتر نتایج به سال:
Rapid methyl parathion detection was measured using a fabricated glassy carbon electrode (GCE) sensor designed the layer-by-layer (LBL) method. Multilayer assemblies were developed on by alternating depositions of anions and cations in which Dawson Type Polyoxometalate ?-K 6 [(P 2 W 18 O 62 ·H O)]·14H (?P POM) polyethyleneimine (PEI) stabilized silver nanoparticles (?PEI-AgNPs) acted as cations...
Bifunctional acidic ionic liquids, having both H-imidazolium and -SO3H groups as cation moieties (H-BFAILs) and CF3SO3- as anion, were synthesized in high yields. These H-BFAILs showed significant hydrophilic properties, lower acidity and higher thermal stability relative to common ionic liquids, due to their unique structures. The (propyl or butyl-3-sulfonic) imidazolium trifluoromethane sulfo...
An efficient and eco-friendly method for the one-pot synthesis of 14-aryl-14H-dibenzo [a,i]xanthene-8,13-dione derivatives has been developed in the presence of Fe3O4@SiO2 core-shell nanoparticles. The multi-component reactions of 2-hydroxy-1,4-naphthoquinone, β-naphthol and aldehydes were efficiently catalyzed using novel nano-scale materials under reflux conditions. The present method offers ...
In this research, a Brønsted acidic ionic liquid namely N1,N1,N2,N2-tetramethyl-N1,N2-bis(sulfo)ethane-1,2-diaminium chloride {[TMBSED][Cl]2} was employed as a highly efficient catalyst for the solvent-free production of some nitrogen- and oxygen-containing heterocyclic compounds including: (i) polyhydroquinolines (from arylaldehydes, dimedone, β-ketoesters and ammonium acetate), (ii) 3,4-dihyd...
In the title compound, C(27)H(15)Br(2)ClO·C(3)H(7)NO, the xanthene moiety has a flattened boat conformation with a folding angle between the naphthalene units of 9.46 (3)°. The mean planes of the xanthene system and its 4-chloro-phenyl substituent are nearly perpendicular [dihedral angle = 89.43 (5)°]. The dimethyl-formamide solvent mol-ecule is disordered over two sets of sites with an occupan...
El cogollero del maíz (Spodoptera frugiperda) es la plaga más importante de este cultivo en región San Martín, su crianza masiva, para fines estudiar biología, enemigos naturales y otros, se ve limitada por falta insumos; esta razón el objetivo estudio fue evaluar los diferentes parámetros fisiológicos biológicos S. frugiperda, criada una dieta artificial elaborada con insumos región. Se utiliz...
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