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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
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
–
Use
2-(2-hydroxyphenyl)-2H-benzotriazoles are used as
UV stabilizers in
lacquers and
plastics .
[2]
References