119-66-4Relevant articles and documents
A comprehensive spectroscopic, solvatochromic and photochemical analysis of 5-hydroxyquinoline and 8-hydroxyquinoline mono-azo dyes
Coelho, Paulo J.,Lup, Andrew Ng Kay,Mahon, Peter J.,Pesyan, Nader Noroozi,Ramezanitaghartapeh, Mohammad,Raposo, M. Manuela M.,Rashidnejad, Hamid,Soltani, Alireza
, (2020/10/06)
A series of novel substituted-azo dyes 8-(aryldiazenyl)quinolin-5-ol (5a-i) were synthesized by the coupling reaction of 5-hydroxyquinoline with diazotized aniline derivatives in the presence of NaNO2 in HCl/H2O mixture. The study of
OPTICAL MATERIAL COMPRISING A RED-SHIFTED BENZOTRIAZOLE UV ABSORBER
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Paragraph 0103; 0104, (2019/04/26)
The present invention relates to an eyeglass lens comprising a substrate made of an optical material comprising a polymer matrix and at least one 2-(2-hydroxy-5-R1-phenyl)benzotriazole, in which R1 is a resonant group, the optical tr
Preparation method of ultraviolet absorbent UV - 329 (by machine translation)
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Paragraph 0032; 0035; 0039; 0042; 0046; 0049, (2019/08/26)
The invention provides a preparation method, UV - 329, of an ultraviolet absorber. The method comprises the following steps: performing ammonification, diazotization, coupling, one-step reduction, two-step reduction reaction and post-treatment to prepare 2 - (2 '- hydroxyl -5' - t-octylphenyl) benzotriazole product by o-nitrochlorobenzene. To the method, by ammonia water with a concentration 10%~25%, o-nitrochlorobenzene is subjected to diazotization reaction with nitrite to generate a diazonium salt, the diazotization reaction does not need to be carried out in a strong acid medium, and byproduct ammonia water of the product in the company is comprehensively utilized. The reduction closed-loop process of the intermediate azo product adopts 2-step reduction method, the strong reducing agent is prevented from directly reducing the azo double bond to the amine, impurity generation, product purity, and yield. (by machine translation)