Results 221 to 230 of about 21,034 (299)

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

Aquatic environmental fates and risks of benzotriazoles, benzothiazoles, and p-phenylenediamines in a catchment providing water to a megacity of China.

Environmental Research, 2022
Wearing of vehicle parts could release many chemical additives into the environment, such as benzotriazoles (BTRs), benzothiazoles (BTHs), and p-phenylenediamines (PPDs), which are potentially toxic to wildlife and humans.
Ruiling Zhang, Shizhen Zhao, Xin Liu, Lele Tian, Yangzhi Mo, Xin Yi, Shiyang Liu, Jiaqi Liu, Jun Li, Gan Zhang   +9 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.
Yulin 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

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

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

Intercalated complexes of 1T′-MoS2 nanosheets with alkylated phenylenediamines as excellent catalysts for electrochemical hydrogen evolution

Journal of Materials Chemistry A, 2019
Two-dimensional 1T′ phase MoS2 that was intercalated with a series of alkylated p-phenylenediamines exhibits excellent catalytic activity toward hydrogen evolution reaction, supported by first-principles calculations.
I. Kwak, Ik Seon Kwon, H. Abbas, Jaemin Seo, Gabin Jung, Yeron Lee, Doyeon Kim, Jae-pyoung Ahn, Jeunghee Park, H. Kang   +9 more
semanticscholar   +1 more source

Self-Propelled Micromotors for Naked-Eye Detection of Phenylenediamines Isomers.

Analytical Chemistry, 2018
Tubular micromotors composed of a hybrid single-wall carbon nanotube (SW)-Fe2O3 outer layer and powered by a MnO2 catalyst are used for phenylenediamines isomers detection and discrimination.
R. María-Hormigos, B. Jurado‐Sánchez, A. Escarpa   +2 more
semanticscholar   +1 more source

A niobium-catalyzed coupling reaction of α-keto acids with ortho-phenylenediamines: synthesis of 3-arylquinoxalin-2(1H)-ones

Green Chemistry, 2019
A general methodology to access valuable 3-arylquinoxalin-2(1H)-ones was developed, by the reaction of α-keto acids with ortho-phenylenediamines in the presence of ammonium niobium oxalate (ANO) as a catalyst.
Camila P. Ebersol, N. Rocha, Filipe Penteado, M. Silva, Daniela Hartwig, E. Lenardão, R. Jacob   +6 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