Results 221 to 230 of about 24,479 (307)

Polymers of phenylenediamines

Progress in Polymer Science, 2015
Abstract The chemical or electrochemical oxidation of phenylenediamines in acidic aqueous media yields the corresponding oligomers or polymers. Their structures and properties are discussed in relation to a closely-related conducting polymer, polyaniline.
J. Stejskal
openaire   +2 more sources

Synthesis of benzimidazoles from o -phenylenediamines and DMF derivatives in the presence of PhSiH 3

Tetrahedron, 2017
Chengxia Miao
exaly   +2 more sources

Widespread Occurrence and Transport of p-Phenylenediamines and Their Quinones in Sediments across Urban Rivers, Estuaries, Coasts, and Deep-Sea Regions.

Environmental Science and Technology, 2023
p-Phenylenediamines (PPDs) are widely used as antioxidants in tire rubber, and their derived quinone transformation products (PPD-Qs) may pose a threat to marine ecosystems. A compelling example is N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD)
Lixi Zeng, Yi Li, Yuxin Sun, Liang-Ying Liu, Mingjie Shen, Bibai Du   +5 more
semanticscholar   +1 more source

Structurally Selective Ozonolysis of p-Phenylenediamines and Toxicity in Coho Salmon and Rainbow Trout. [PDF]

Environmental Science and Technology
The tire rubber-derived ozonation product of N-(1,3-dimethylbutyl)-N\u27-phenyl-p-phenylenediamine (6PPD), N-(1,3-dimethylbutyl)-N\u27-phenyl-p-phenylenediamine-quinone (6PPD-Q), was recently discovered to cause acute mortality in Coho Salmon ...
Linna Xie, Jie Yu, Pranav Ajit Nair, Jianxian Sun, Holly Barrett, Oliver Meek, Xing Qian, Diwen Yang, Lisa Kennedy, Derek Kozakiewicz, Chunyan Hao, John D Hansen, J. Greer, J. Abbatt, Hui Peng   +14 more
semanticscholar   +3 more sources

Copper-catalyzed aerobic oxidative coupling of o-phenylenediamines with 2-aryl/heteroarylethylamines: direct access to construct quinoxalines.

Organic and biomolecular chemistry, 2017
A versatile method for synthesis of quinoxalines by Cu-catalyzed oxidative coupling of o-phenylenediamines with 2-arylethylamines is presented.
Kovuru Gopalaiah, Anupam Saini, S. Chandrudu, Devarapalli Chenna Rao, Harsh Yadav, B. Kumar   +5 more
semanticscholar   +2 more sources

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

Synthesis of quinoxalines through iodine-catalyzed one-pot annulation of alkynes with o-phenylenediamines

Synthetic Communications, 2018
Xun-Xiang Guo
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