Results 231 to 240 of about 24,479 (307)

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, Yang-Yang Feng, Xiaohui Zhang, Yan Xiong   +4 more
semanticscholar   +1 more source

Transmonocyanoacetylation of phenylenediamines: a simple and efficient synthesis of novel N-(aminophenyl)-2-cyanoacetamides and their derivatives

Tetrahedron Letters, 2016
Samir Y Abbas, Yousry A Ammar, Mostafa Ghorab   +2 more
exaly   +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, Guo-Hui 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 ...
Ning-Bo Geng, Shijiao Hou, Shuai Sun, Rong Cao, Hai-Jun Zhang, Xian-Bo Lu, Shu-Sheng Zhang, Ji-Ping Chen, Yan-Hao Zhang   +8 more
semanticscholar   +1 more source

Sensitization to p-Phenylenediamine

Archives of Dermatology, 1965
p-Phenylenediamine (PPD) from 0.2 mg to 1.6 mg in water or in petrolatum was applied as a patch test to 501 patients with different dermatoses, asthma, hay fever, and venereal diseases. Of these patients 10.6% reacted within the first five days indicating previous hypersensitivity and 14.4% between the sixth and the 16th day indicating the initiation ...
openaire   +3 more sources

Occurrence, fate and chiral signatures of p-phenylenediamines and their quinones in wastewater treatment plants, China.

Water Research
p-Phenylenediamines (PPDs) and their derived quinones (PPD-Qs) are emerging pollutants. Information on their occurrence, fate and chiral signatures in the wastewater treatment plant (WWTP) and its receiving waters is scarce.
Jiabin Wang, Yi Li, Chutong Nie, Junxing Liu, Jingjing Zeng, Mi Tian, Zhenguo Chen, Mingzhi Huang, Zhe Lu, Yuxin Sun   +9 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

Occurrence and risk assessment of p-phenylenediamines and their quinones in aquatic environment: From city wastewater to deep sea.

Science of the Total Environment
p-Phenylenediamines (PPDs) and PPD-derived quinones (PPD-Qs) have been considered emerging pollutants recently. Their available data on sediment and sewage sludge are limited, especially the ecological risks.
Tingzhi Xu, Jia-Liang Guo, Jing-Feng Yi, Si-Nan Huang, Liang-Ying Liu, Ying Guo   +5 more
semanticscholar   +1 more source

Regioselective “hydroamination” of alk-3-ynones with non-symmetrical o-phenylenediamines. Synthesis of diversely substituted 3H-1,5-benzodiazepines via (Z)-3-amino-2-alkenones

, 2016
The reaction of alk-3-yn-1-ones (a bifunctional reagent) with o-phenylenediamines provides an effective synthetic method with high atom economy for the preparation of diversely substituted 1,5-3H-benzodiazepines.
Jonathon Young, C. Schäfer, Agnes Solan, Anthony Baldrica, Miranda R Belcher, Bilal Nişancı, K. Wheeler, Evan R. Trivedi, B. Török, R. Dembinski   +9 more
semanticscholar   +2 more sources