نتایج جستجو برای: 12 phenylenediamine

تعداد نتایج: 582123  

Journal: :Inorganic chemistry frontiers 2021

“Click” dendrimer-Pd NPs as peroxidase enzyme mimics of H2O2 sensing using o-phenylenediamine oxidation by to 2,3-diaminophenazine.

Journal: :Nucleation and Atmospheric Aerosols 2022

Data on the protection performance of n,n dimethylaminoethanol (DAE), 2-amino-5-ethyl-1,2,3-thiadiazole (TDZ), p-phenylenediamine (PDM) and diphenylthiourea (THO) mild steel in 0.5M H2SO4 HCl solution were studied. The compounds more effective solution. N, n displayed most at all concentrations studied with optimal value 97.901% 90.671% HCl. P- phenylenediamine compound exhibited weak both acid...

2017
O. V. Soldatkina I. S. Kucherenko V. M. Pyeshkova S. A. Alekseev O. O. Soldatkin S. V. Dzyadevych

In this work, we studied the conditions of deposition of a semipermeable polyphenylenediamine (PPD)-based membrane on amperometric disk platinum electrodes. Restricting an access of interfering substances to the electrode surface, the membrane prevents their impact on the sensor operation. Two methods of membrane deposition by electropolymerization were compared-at varying potential (cyclic vol...

2013
Yekkirala Venkateswarlu Sudhagani Ramesh Kumar Panuganti Leelavathi

BACKGROUND We report the synthesis of benzimidazoles using lanthanum chloride as an efficient catalyst. One-pot synthesis of 2-substituted benzimidazole derivatives from o-phenylenediamine and a variety of aldehydes were developed under mild reaction conditions. RESULTS We have examined the effect of different solvents using the same reaction conditions. The yield of the product varied with t...

Journal: :Regulatory toxicology and pharmacology : RTP 2014
Emma Westerholm Linda Schenk

Dermal exposure to chemicals is highly relevant in relation to the use of cosmetic products, both in consumers and in individuals exposed occupationally. Regulatory frameworks exist within the EU to limit the dermal exposure of the general population and workers to chemicals in general, as well as to limit the use of certain substances in cosmetic products. The objective of the study was to inv...

A simple, fast, efficient and environmentally friendly method for synthesis of benzimidazole and its 2-alkyl, aryl and heteroaryl substituted derivatives was developed using zeolite HY. Two component cyclolcondensation of 1,2-phenylenediamine (o-phenylenediamine) and commercially available carboxylic acids catalyzed by zeolite HY without any solvent, under microwave irradiation led to formation...

Ahmad Reza Momeni, Heshmat Allah Samimi Reyhaneh Jahanian

An efficient one-pot oxidation/condensation tandem process has been developed for the synthesis of 2-substituted benzimidazole derivatives from benzylic alcohols and 1,2-phenylenediamine with use of urea-hydrogen peroxide/silica phosphoric acid  as a bifunctional catalyst. This method provides a rapid and efficient access to 2-substituted benzimidazoles.

Journal: :iranian journal of catalysis 0
chandrakant bhenki department of chemistry, rajaram college, kolhapur 416004, india. shrikrishna karhale department of chemistry, rajaram college, kolhapur 416004, india. vasant helavi department of chemistry, rajaram college, kolhapur 416004, india.

a water soluble, bronsted acid, 5-sulfosalicylic acid as an efficient organocatalyst was used for the synthesis of physiologically active 2-substituted benzimidazole derivatives from o-phenylenediamine and aromatic aldehydes in ethanol at reflux condition. cost-effectiveness, use of non-hazardous solvents, metal free and commercially available catalyst, single-step, environmentally friendly gre...

Journal: :journal of nanostructures 2012
g. mohammadi ziarani a. badiei m. shakiba nahad s. ghadim alizadeh

in this article, simple, convenient synthesis of 2-aryl-1-arylmethyl-1h-1,3-benzimidazole (1,2-disubstitutedbenzimidazoles) via condensation of 1,2-phenylenediamine and aromatic aldehydes using sba-pr-so3h as a nanoporous solid acid catalyst in green protocol was reported.

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