Results 191 to 200 of about 23,580 (267)

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

P-phenylenediamines (PPDs) and 6PPD-quinone in tunnel PM2.5: From the perspective of characterization, emission factors, and health risks.

Journal of Hazardous Materials
P-phenylenediamines (PPDs) and a quinone derivative (6PPD-Q), as antioxidants added to tires, can inevitably enter into the environment during tire wear emission, posing potential health and ecological risks.
Nan Jiang, Minzhen Li, Zichen Wang, Xuexin Hao, Zhangpeng Guo, Jiasen Guo, Rui-qin Zhang, Haijun Zhang, Jiping Chen, Ningbo Geng   +9 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

Sulfur-Promoted Access to 3-Arylquinoxalin-2-ones by Oxidative Coupling of o-Phenylenediamines with Arylacetates.

Organic Letters
We disclose the synthesis of 3-arylquinoxalin-2-ones from o-phenylenediamines and readily available arylacetates. The method harnesses the selective oxidative property of elemental sulfur in the presence of amine base catalyst and DMSO. The reactions are
L. A. Nguyen, Thi Yen Tran, Q. Ngo, D. Mac, Pascal Retailleau, Thanh Binh Nguyen   +5 more
semanticscholar   +1 more source

Electrochemical Oxidative (4 + 2) Cyclization of Anilines and o-Phenylenediamines for the Synthesis of Phenazines.

Organic Letters
Phenazines, crucial constituents of nitrogen-containing heterocycles, widely exist in functional compounds. Herein, we report an anodic oxidative (4 + 2) cyclization between anilines and o-phenylenediamines for the uniform construction of phenazines in a
Peng-Fei Huang, Jiangchen Fu, Ying Peng, Ke‐Wen Tang, Yu Liu   +4 more
semanticscholar   +1 more source

Ultrasound-Assisted Polymerization of Dyes with Phenylenediamines: Facile Method To Design Polymeric Photosensitizers with Enhanced Singlet Oxygen Generation Characteristics and Anticancer Activity

Industrial & Engineering Chemistry Research, 2019
The present work reports for the first time ultrasound-assisted polymerization of Alizarin Red (AR), Amido Black 10B (AB-10B), 1,4-Benzoquinone (BQ) with ortho and para-phenylenediamines.
Neetika Singh, Prabhat Kumar, Raj Kumar, U. Riaz   +3 more
semanticscholar   +1 more source

Imidazolium chloride-catalyzed synthesis of benzimidazoles and 2-substituted benzimidazoles from o-phenylenediamines and DMF derivatives

Tetrahedron, 2018
A facile, general, and economical synthesis of diversely functionalized benzimidazoles and 2-substituted benzimidazoles has been realized via the imidazolium chloride-catalyzed cyclization of o-phenylenediamines with DMF derivatives.
Zongjie Gan, Qingqiang Tian, Suqin Shang, Wen Luo, Zeshu Dai, Huajun Wang, Dan Li, Xuetong Wang, Jianyong Yuan   +8 more
semanticscholar   +1 more source