119-66-4

Upstream product

• 14527-90-3 2-nitroaniline hydrochloride 
• 88-74-4 2-nitro-aniline 
• 110-46-3 isopentyl nitrite 
• 58364-72-0 3-methyl-2-[(1Ξ,2E)-(2-nitro-phenyl)-triazenylidene]-2,3-dihydro-benzothiazole 
• 58558-01-3 3-methyl-2-[(1Ξ,2Z)-(2-nitro-phenyl)-triazenylidene]-2,3-dihydro-benzothiazole 
• 7647-01-0 hydrogenchloride 
• 109341-82-4 N-(2-nitro-phenyl)-N'-(4-nitro-phenyl)-triazene 
• 88-73-3 2-Chloronitrobenzene 

Downstream Products

• 37522-26-2 ethyl [(2-nitrophenyl)hydrazono](chloro)acetate 
• 18648-69-6 (2-(2-nitrophenyl)ethene-1,1-diyl)dibenzene 
• 1435-71-8 4-methyl-2-(2-nitrophenylazo)phenol 
• 147459-57-2 (α-nitro-isopropyl)-(2-nitro-phenyl)-diazene 
• 63014-17-5 (2-nitro-phenylhydrazono)-acetic acid 
• 63014-22-2 N_.N'-Bis-(2-nitro-phenyl)-formazylwasserstoff 
• 1060-61-3 9,10-bis-(2-nitro-phenyl)-anthracene 
• 52183-19-4 (2-Nitro-benzol)-(1 azo 6)-(3-oxy-1-methyl-4-isopropyl-benzol) 
• 92150-30-6 acetic acid-[4-hydroxy-3-(2-nitro-phenylazo)-anilide] 
• 1516-58-1 o-azidonitrobenzene 
• 41565-44-0 3-(2-nitro-phenyl)-1-p-tolyl-triazen-1-ol 
• 76151-92-3 N-(2-nitro-phenyl)-N'-p-tolyl-triazene 
• 109845-66-1 N-(2-nitro-phenyl)-N'-o-tolyl-triazene 

Relevant academic research and scientific papers

A comprehensive spectroscopic, solvatochromic and photochemical analysis of 5-hydroxyquinoline and 8-hydroxyquinoline mono-azo dyes

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

Preparation method of 3-[3-(-benzotriazole -2-base)-4-hydroxy -5-tert-butylphenyl]- propionate (by machine translation)

3 - (3,5 - Of the process reduces, the tedious degree) of the process, omits the crystallization separation process, in the preparation process of the target product, saves the raw material ", and reduces the output " of waste, water and inorganic salt and other wastes 3 - [3 - (.) - 4 - The method, of the, present invention reduces the complexity, of the process by the. method] - of separating, and purifying the intermediate product, without isolation. (by machine translation)

OPTICAL MATERIAL COMPRISING A RED-SHIFTED BENZOTRIAZOLE UV ABSORBER

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

Preparing method of ultraviolet absorber UV-234

The invention provides a preparing method of an ultraviolet absorber UV-234. The preparing method comprises the steps of conducting ammoniation, diazotization, coupling, first-step reduction, second-step reduction reaction and post-treatment on ortho-nitrochlorobenzene to prepare 2-[2'-hydroxy-3',5'-di(alpha,alpha-dimethyl benzyl)phenyl]benzotriazole. According to the preparing method, ortho-nitrochlorobenzene is ammonified by adopting ammonium hydroxide with the concentration of 10-25%, then is subjected to diazotization with nitrite to produce diazonium salt, no diazotization needs to occurunder a strong acid medium, by-product ammonium hydroxide of existing products of a company is comprehensively utilized, low emission of three wastes is achieved, and the required cost is low; a two-step reduction method is adopted in a reduction ring closing process of intermediate azo products, the situation is avoided that a strong reduction agent directly reduces azo double bonds into amine, impurity production is reduced, and not only is the purity of the products increased but also the product yield is increased.

Preparation method of ultraviolet absorbent UV - 329 (by machine translation)

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)

New fluorescent symmetrically substituted perylene-3,4,9,10-dianhydride- azohybrid dyes: Synthesis and spectroscopic studies

Five phenolic azo-dyes (3a-e) were synthesized by diazo coupling of the suitably substituted anilines (1a-e) with phenol at low temperature in alkaline medium. The resulting dyes have low solubility in aqueous medium due to lack of carboxylic or sulfonic

SILYLATED, SUBSTITUTED BENZOTRIAZOLYLPHENOL COMPOUNDS

The present invention relates to silylated substituted benzotriazolylphenol compounds of general formula (I) a process for their preparation, a pharmaceutical and/or cosmetic composition comprising these compounds, their use for the preparation of a pharm

Organosilyl-Benzo-triazole derivatives, processes for their production and their use as UV protecting agents

The present invention refers to new benzotriazole derivatives, which for their physicochemical properties can be used as UV protection agents. In addition, they can be used to manufacture cosmetic, dermatological, veterinarian as well as pharmaceutical formulations, which protect the skin, lips, nails and hair against UV radiation.

Synthesis of new ultraviolet light absorbers based on 2-aryl-2H- benzotriazoles

A procedure for the synthesis of some new ultraviolet absorbers of the benzotriazole series is reported. The compounds bear a carboxylic or a formyl group para to the hydroxy group, and these functionalities impart to the absorbers improved compatibility with certain disperse dyes on polyester fibers.

Processes for the preparation of benzotriazole UV absorbers

Provided is a process for preparing 2H-benzotriazole UV absorbers containing a perfluoroalkyl moiety at the 5-position of the benzo ring, for example a trifluoromethyl group, which involves diazotizing the perfluoroalkyl substituted o-nitroaniline using concentrated sulfuric acid plus sodium nitrite or nitrosylsulfuric acid to form the corresponding monoazobenzene intermediate via the diazonium salt intermediate which is reduced to the corresponding 5-perfluoroalkyl substituted 2H-benzotriazole UV absorber compound by conventional reduction means. Also provided is a novel one-pot, multiphase reaction for the preparation of 2(2-nitrophenylazo) substituted phenols, which are precursors for 2H-benzotriazole UV absorbers.