ChemicalBook CAS DataBase List UV Absorber 326

UV Absorber 326 synthesis

7synthesis methods

Product Name:UV Absorber 326
CAS Number:3896-11-5
Molecular formula:C17H18ClN3O
Molecular Weight:315.8

6-tert-Butyl-4-methyl-2-[(4-chloro-2-nitrophenyl)azo]phenol

22617-04-5
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3896-11-5
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Yield:3896-11-5 97.4%

Reaction Conditions:

with borane-ammonia complex in toluene at 50; for 5 h;

Steps:

15.15.2 15.2 Preparation of UV-326

_{In a 250mL three-necked flask, add 0.2g of the prepared 1% Pd/MgO catalyst,10g UV-326 azo intermediate, about 60mL toluene, 10g ammonia borane,Start stirring after heating to 50°C (stirring rate is about 600rpm), and react for 5h;After the reaction, the catalyst is filtered and the organic layer is separated,The composition of hydrogenation products in the filtrate was analyzed by high performance liquid chromatography; the solvent was evaporated under reduced pressure,After washing with deionized water and methanol, and drying, the target product is obtained.}

References:

CN112645892,2021,A Location in patent:Paragraph 0174; 0177-0178; 0193