52184-19-7

Usage

InChI:InChI=1/C22H29N3O3/c1-7-21(3,4)15-13-16(22(5,6)8-2)20(26)18(14-15)24-23-17-11-9-10-12-19(17)25(27)28/h9-14,23H,7-8H2,1-6H3/b24-18+

Upstream product

• 88-73-3 2-Chloronitrobenzene 
• 88-74-4 2-nitro-aniline 
• 120-95-6 2,4-di-tert-amylphenol 

Relevant academic research and scientific papers

Preparation method of ultraviolet absorber UV-328

A preparation method of an ultraviolet absorber UV-328 is provided. The method includes o-nitrochlorobenzene ammoniation, diazotization, coupling, a first reduction step, a second reduction reaction and after-treatment to prepare a 2-(2'-hydroxyl-3',5'-di-tert-amyl phenyl) benzotriazole product. Ammonia water having a concentration of 10-25% is adopted for o-nitrochlorobenzene ammoniation, then diazotization is performed with nitrite to generate a diazonium salt, the diazotization does not need a strong acidic medium, and the ammonia water which is a byproduct of products of the company is comprehensively utilized, thus achieving low emission of three wastes and a low cost. Reduction for ring closing of an intermediate azo product adopts a two-step reduction process, avoiding a situation that a strong reductant directly reduces azo double bonds into amine, reducing impurity generation, increasing product purity and increasing the product yield.

Method of preparing 2-phenyl benezothriazoles

A method of preparing 2-phenylbenzotriazoles expressed by Formula I: STR1 (wherein R1 denotes a hydrogen or chlorine atom, a lower alkyl group having 1 to 4 carbon atoms, a lower alkoxyl group having 1 to 4 carbon atoms, a carboxyl group or a sulfonic acid group; R2 denotes a hydrogen or chlorine atom, a lower alkyl group having 1 to 4 carbon atoms or a lower alkoxyl group having 1 to 4 carbon atoms; R3 denotes a hydrogen or chlorine atom, an alkyl group having 1 to 12 carbon atoms, a lower alkoxy group having 1 to 4 carbon atoms, a phenyl group, a phenyl group substituted by an alkyl group having 1 to 8 carbon atoms, a phenoxy group or a phenylalkyl group with an alkyl part having 1 to 4 carbon atoms; R4 denotes a hydrogen or chlorine atom, a hydroxyl group or an alkoxyl group having 1 to 4 carbon atoms; and R5 denotes a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or a phenylalkyl group with an alkyl part having 1 to 4 carbon atoms) comprises reducing with hydrogen 2-phenylbenzotriazole-N-oxides expressed by Formula II: STR2 (wherein R1, R2, R3, R4 and R5 each denotes the same as in Formula I).