Structures of the pyrazolones formed by oxidative coupling of phenols with 4-aminoantipyrine

Abstract

. 2082 (1987). 65,The structures of reaction products between 4-amino-2,3-dimethyl-l-phenyl-3-pyrazolin-5-one and o-cresol, p-cresol, and p-ethylphenol are reported. The reaction of the former compound with phenols is used to estimate the concentration of phenol in 65, 2082 (1987).On a dCterminC les structures des produits de la rCaction de l'amino-4 dimethyl-2,3 phCnyl-1 pyrazoline-3 one-5 avec 1'0-crksol, le p-crtsol et le p-CthylphCnol. On utilise la rCaction de ce produit hCtCrocyclique avec les phCnols pour dtterminer la concentration des phtnols dans les sources d'eau potable. Les produits de la rkaction sont respectivement la dimethyl- [Traduit par la revue]

Novel (photo)electrochemical analysis of aqueous industrial samples containing phenols

“…The reaction of phenols with 4-AAP in the presence of an oxidizing agent such as K3Fe(CN)6 or K2S2O8 leads to the generation of a p-quinoneimide product, according to the Emerson reaction (Figure S1). [17][18][19] This method is commonly used due to its high speed, low price and easy-to-use feature without the need of many sample pre-treatment steps. [20] Nonetheless, not all phenols can be measured with this method, especially, some p-substituted phenols do not provide a colored product.…”

“…[20] Nonetheless, not all phenols can be measured with this method, especially, some p-substituted phenols do not provide a colored product. [18,19] Next to these color test kits, chemical oxygen demand (COD) test kit has been applied for the determination of organic pollutants in various water streams, including industrial ones. The COD method is commonly used by regulatory entities to evaluate the pollution degree of a specific sample or stream.…”

Efficient synthesis of 1,2-bis(alkoxycarbonyl)pyrazol-3-ones from 2,3-allenoic acids, azodicarboxylates and PPh3

“…Pyrazol-3-ones and derivatives are important structural motifs for agricultural chemistry and pharmaceutical development (Scheme 1), 1,2 which exhibit a wide range of biological applications, for example, as herbicides, 3 insecticides, 4 analgesic agents, 5 antiinflammatory agents, 6 and therapeutic agents. 7 They have also been used as analytical reagents 8 and dyes. 9 For these reasons, there are many reports dealing with the development of efficient synthetic methods for pyrazol-3-ones and derivatives.…”