Results 41 to 50 of about 24,479 (307)
Journal of Chemistry, 2013 The present paper introduces a simple and efficient method for the synthesis of substituted benzimidazoles by heterocyclization of different o-phenylenediamines and substituted aromatic carboxylic acid/aldehyde in the presence of zirconyl nitrate as ...
Pratapsinha B. Gorepatil +2 more
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Simple, mild, and highly efficient synthesis of 2-substituted benzimidazoles and bis-benzimidazoles
Química Nova, 2014 A new convenient method for preparation of 2-substituted benzimidazoles and bis-benzimidazoles is presented. In this method, o-phenylenediamines were condensed with bisulfite adducts of various aldehydes and di-aldehydes under neat conditions by ...
Bilge Eren, Yunus Bekdemir
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Redox Potential Inversion by Ionic Hydrogen Bonding between Phenylenediamines and Pyridines
, 2020 [[abstract]]In electrochemical oxidations, the second oxidation potential of phenylenediamines (PD) varies because of hydrogen-bonding formation for PD(+center dot) with pyridines.
Chiu, KY, 裘坤元
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, 2022 International audienceQuinoxalin-2-thiones were readily synthesized from o -phenylenediamines, ketones and sulfur. The reactions proceeded under simple and mild conditions with chromatography-free purification and were amenable to large-scale ...
Nguyen, Thanh Binh +4 more
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A Fast and Efficient Method for the Synthesis of 1,5-Benzodiazepine Derivatives Under Solvent-Free Conditions [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 2007 Silica sulfuric acid is found to catalyze efficiently the condensation of o-phenylenediamines with various linear and cyclic ketones to afford the corresponding 1,5-benzodiazepines in quantitative yields under solvent-free conditions at room ...
Ahmad Shaabani, Ali Maleki
doaj
Electrochemical amination of para-chloroaniline
Учёные записки Казанского университета: Серия Естественные науки, 2019 The process of cation-radical amination of para-chloroaniline using hydroxylamine and the Ti(IV)/Ti(III) mediator system was studied in aqueous solutions of 9–17 M H2SO4.
Yu.A. Lisitsyn
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Journal of Food and Drug Analysis, 2019 Phenylenediamines (PDs), which are reported to cause allergic dermatitis and possess genotoxicity and carcinogenicity, are the ingredients used in permanent hair dyes.
H. Ko +3 more
semanticscholar +1 more source
, 2018 The synthesis of N-heterocycles of quinoxalines has been developed by an efficient protocol of one-pot annulation of alkynes with o-phenylenediamines. A variety of quinoxalines were prepared in good to high yields in the presence of catalytic amount of ...
Zhe-Yao Hu (4925218) +5 more
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Proton‐Switching Regulates Interfacial Iodine Chemistry for Long‐Life Zinc–Iodine Batteries
Angewandte Chemie, EarlyView.A proton‐switchable imine‐linked framework is developed to dynamically regulate interfacial iodine chemistry in aqueous Zn–I2 batteries, where reversible protonation/deprotonation switches the host affinity between iodide and polyiodide species. This state‐dependent regulation suppresses shuttle‐induced side reactions while preserving fast iodine redox
Feifei Wang +14 more
wiley +2 more sources
Illegally additives determination by thin layer chromatography
MATEC Web of Conferences, 2016 To find out a simple TLC method, which could identify m-phenyenediamine and o-phenylenediamine in several colors of oxidation hair coloring products simultaneously. The colors includes black, yellow, brown and red. A small amount of the sample was placed
Liang Xin +3 more
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