Class of chemical compounds
General structural formula of 2-(2-hydroxyphenyl)-2H -benzotriazoles 2-(2-Hydroxyphenyl)-2H -benzotriazoles , also referred to as phenolic benzotriazoles , are an important class of UV absorbers [1] comprising the benzotriazole building block .
Structure [ edit ] The molecules are composed of substituted benzotriazoles with a phenyl group in the 2-position, which carries a hydroxy group in the ortho -position.[2]
Examples of 2-(2-hydroxyphenyl)-2H -benzotriazoles Name Acronym Structural formula R1 R2 R3 2-(2H -Benzotriazol-2-yl)-4-methylphenol UV-P – methyl – 2-(2H -Benzotriazol-2-yl)-4-tert -butylphenol UV-PS – tert -butyl – 2-(2H -Benzotriazol-2-yl)-4,6-bis(2-phenyl-2-propanyl)phenol UV-234 (2-propanyl)phenol (2-propanyl)phenol – 2-(2H -Benzotriazol-2-yl)-4,6-di-tert -butylphenol UV-320 tert -butyl tert -butyl – 2-(5-Chloro-2H -benzotriazol-2-yl)-4-methyl-6-di-tert -butylphenol UV-326 tert -butyl methyl chlorine 2-(5-Chloro-2H -benzotriazol-2-yl)-4,6-di-tert -butylphenol UV-327 tert -butyl tert -butyl chlorine 2-(2H -Benzotriazol-2-yl)-4,6-di-tert -pentylphenol UV-328 tert -pentyl tert -pentyl – 2-(2H -Benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol UV-329 – 1,1,3,3-tetramethylbutyl – 2-(2H -Benzotriazol-2-yl)-6-(sec -butyl)-4-(tert -butyl)phenol UV-350 sec -butyl tert -butyl – 2,2′-Methylenbis[6-(2H -benzotriazol-2-yl)-4-(2,4,4-trimethyl-2-pentanyl)phenol] UV-360 [dimer linked via methylene group ] 1,1,3,3-tetramethylbutyl – 2-(2H -Benzotriazol-2-yl)-6-(2-phenyl-2-propanyl)-4-(2,4,4-trimethyl-2-pentanyl)phenol UV-928 (2-propanyl)phenol 1,1,3,3-tetramethylbutyl –
2-(2-hydroxyphenyl)-2H-benzotriazoles are used as UV stabilizers in lacquers and plastics .[2]
References [ edit ]