Results 11 to 20 of about 1,389 (220)

Polystyrene-supported pyridinium chloroaluminate ionic liquid as a new heterogeneous Lewis acid catalyst for selective synthesis of benzimidazoles [PDF]

Journal of the Serbian Chemical Society, 2013
Polystyrene-supported pyridinium chloroaluminate ionic liquid was prepared from the reaction of Merrifield resin with pyridine followed by reaction with aluminium chloride.
Parvanak Boroujeni Kaveh, Zhianinasab Ashkan, Jafarinasab Mina   +2 more
doaj   +1 more source

Electrochemical amination of N,N-dimethylaniline

Учёные записки Казанского университета: Серия Естественные науки, 2021
The process of indirect cathodic amination of N,N-dimethylaniline using the Ti(IV) – NH2OH system was studied in aqueous solutions of 7–16 M sulfuric acid at 40 ?C.
Yu.A. Lisitsyn
doaj   +1 more source

A novel approach toward the synthesis of some new tridentate Schiff bases from anil-like compounds [PDF]

Journal of the Serbian Chemical Society, 2016
A novel method was developed for synthesizing a series of new three dentate Schiff base ligands starting from hydroxynaphthalidene pyrimidinyl amines with o-phenylenediamines or o-aminophenol or 2-amino-3-hydroxy-pyri-dine in the presence of ...
Bagheri Fatemeh, Olyaei Abolfazl
doaj   +1 more source

Sensitization and Clinically Relevant Allergy to Hair Dyes and Clothes from Black Henna Tattoos: Do People Know the Risk? An Uncommon Serious Case and a Review of the Literature

Cosmetics, 2016
Henna (Lawsonia inermis L.) tattooing has been used in Egypt and India since ancient times. Today this temporary body art is becoming increasingly popular among young people.
Paola A. Moro, Marco Morina, Fabrizia Milani, Marco Pandolfi, Francesca Guerriero, Luca Bernardo   +5 more
doaj   +1 more source

Hydrogenative coupling of nitriles with diamines to benzimidazoles using lignin-derived Rh2P catalyst

iScience, 2021
Summary: Nitrile (C≡N bond) activation for direct organic synthesis has been less explored so far due to a high redox potential of nitrile and its low dissociation energy of C−CN bond.
Jiarui Zhang, Ruxu Yao, Jinzhu Chen, Tao Li, Yisheng Xu   +4 more
doaj   +1 more source

Switchable highly regioselective synthesis of 3,4-dihydroquinoxalin-2(1H)ones from o-phenylenediamines and aroylpyruvates

Beilstein Journal of Organic Chemistry, 2017
3-Acylmethylidene-3,4-dihydroquinoxalin-2(1H)-ones are compounds which possess a wide range of physical and pharmaceutical applications. These compounds can be easily prepared by cyclocondensation of o-phenylenediamines and aroylpyruvates ...
Juraj Dobiaš, Marek Ondruš, Gabriela Addová, Andrej Boháč   +3 more
doaj   +1 more source

Kaolin-SO3H nanoparticles: A new efficient and reusable catalyst for synthesis of 2-substituted benzimidazoles at room temperature [PDF]

Journal of Nanostructures, 2019
Kaolinite clay found its application in medicine, in toothpaste, in cosmetic and as a food additive. Recently, a specially formulated spray is used in fruit and vegetable production to repel the insects and prevent sunburn. Kaolin-SO3H nanoparticles were
Abdolhamid Bamoniri, Bi Bi Fatemeh Mirjalili, Nahid Yaghmaeiyan-Mahabadi   +2 more
doaj   +1 more source

A facile synthesis of phenazine and quinoxaline derivatives using magnesium sulfate heptahydrate as a catalyst [PDF]

Journal of the Serbian Chemical Society, 2011
Convenient and simple procedures for the synthesis of phenazine and quinoxaline derivatives were developed via a reaction of o-phenylenediamines and 1,2-dicarbonyl compounds.
BAHADOR KARAMI, SAEED KHODABAKHSHI
doaj  

Zirconyl (IV) Nitrate as Efficient and Reusable Solid Lewis Acid Catalyst for the Synthesis of Benzimidazole Derivatives

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, Yogesh D. Mane, Vilas S. Ingle   +2 more
doaj   +1 more source

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
doaj   +1 more source