2-(2-Hydroxyphenyl)-2H-benzotriazoles

(Redirected from Phenolic 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.

General structural formula of 2-(2-hydroxyphenyl)-2H-benzotriazoles

Structure

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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

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  1. ^ Entry on UV-Absorber. at: Römpp Online. Georg Thieme Verlag, retrieved 25. January 2020.
  2. ^ a b Entry on 2-(2-Hydroxyphenyl)-2H-benzotriazole. at: Römpp Online. Georg Thieme Verlag, retrieved 25. January 2020.