Results 181 to 190 of about 23,580 (267)

DABCO-Catalyzed DMSO-Promoted Sulfurative 1,2-Diamination of Phenylacetylenes with Elemental Sulfur and o-Phenylenediamines: Access to Quinoxaline-2-thiones.

Organic Letters, 2023
The oxidative amination of alkynes typically requires transition metal catalysts and strong oxidants. Herein, we alternatively utilize DABCO as a sulfur-activating catalyst to achieve the sulfurative 1,2-diamination of phenylacetylenes with elemental ...
Thi Minh Chau Tran, Nang Duy Lai, T. Bui, D. Mac, Thi Thu Trang Nguyen, P. Retailleau, Thanh Binh Nguyen   +6 more
semanticscholar   +1 more source

Aminoguanidine-Catalyzed Reductive Cyclization of o-Phenylenediamines with CO2 in the Presence of Triethoxysilane.

Journal of Organic Chemistry, 2023
An inexpensive and efficient aminoguanidine-catalyzed reductive cyclization of o-phenylenediamines with CO2 in the presence of triethoxysilane is described.
Yuling Sun, K. Gao
semanticscholar   +1 more source

Cobalt-Catalyzed Effective Access to Quinoxalines with Insights in Annulation of Terminal Alkynes and o-Phenylenediamines.

Organic Letters, 2022
A novel methodology for the annulation of terminal alkynes and o-phenylenediamines by using a combination of a cobalt catalyst and oxygen as a terminal oxidant is reported.
Hui Yang, Zhengjuan Hu, Xin-Chang Li, Ling Wu, Xun-Xiang Guo   +4 more
semanticscholar   +1 more source

Primary‐Colored Electrochromism of 1,4‐Phenylenediamines

ChemPlusChem, 2015
Richard Webster
exaly   +2 more sources

Cu(II)-catalyzed synthesis of quinoxalines from o-phenylenediamines and nitroolefins

Tetrahedron Letters, 2013
Yuanjiao Li
exaly   +2 more sources

Poly(phenylenediamine) Dispersions

Journal of Colloid and Interface Science, 2001
The formation and properties of poly(phenylenediamine) colloidal dispersions were investigated. Oxidative dispersion polymerization of 1,3-phenylenediamine dihydrochloride stabilized with poly(N-vinylpyrrolidone) was taken as a reference experiment. Conductivity, temperature, and acidity of the reaction mixture were recorded during the polymerization ...
Tetyana, Sulimenko, Jaroslav, Stejskal, Jan, Prokes   +2 more
openaire   +2 more sources

Ga(ClO4)3-catalyzed synthesis of quinoxalines by cycloaddition of α-hydroxyketones and o-phenylenediamines

Tetrahedron Letters, 2012
, Jian-Ping Zou
exaly   +2 more sources

Synthesis of 1,2-disubstituted benzimidazoles through DDQ-oxidized intramolecular dehydrogenative coupling of N,N′-dialkyl o-phenylenediamines

Tetrahedron, 2020
The synthetic methodology of 1,2-disubstituted benzimidazoles has been developed, which starts from N,N′-dialkyl o-phenylenediamines via intramolecular dehydrogenative coupling under the oxidation of DDQ with mild conditions.
You-an Ma, Ruimei Xiong, Yangyang Feng, Xiaohui Zhang, Yan Xiong   +4 more
semanticscholar   +1 more source

A one-pot synthesis of benzimidazoles via aerobic oxidative condensation of benzyl alcohols with o-phenylenediamines catalyzed by [MIMPs]+Cl-/NaNO2/TEMPO

, 2020
The ionic liquid 1-methyl-3-(3-sulfopropyl)imidazolium chloride ([MIMPs]+Cl-) in combination with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and sodium nitrite (NaNO2) as a catalytic system demonstrates high efficiency in the one-pot two-step aerobic ...
Z. Geng, Hong-yu Zhang, Guohui Yin, Yuecheng Zhang, Jiquan Zhao   +4 more
semanticscholar   +1 more source

A Nationwide Investigation of Substituted p-Phenylenediamines (PPDs) and PPD-Quinones in the Riverine Waters of China.

Environmental Science and Technology
N-(1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamine-quinone (6PPD-Q) has been identified as the cause of the "urban runoff mortality syndrome." Thus, the ecological risks of substituted p-phenylenediamines (PPDs) and their quinone derivatives (PPD-Qs) in ...
Ningbo Geng, Shijiao Hou, Shuai Sun, Rong Cao, Haijun Zhang, Xianbo Lu, Shusheng Zhang, Jiping Chen, Yanhao Zhang   +8 more
semanticscholar   +1 more source