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.

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

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 Chemical structure of UV-P – methyl –
2-(2H-Benzotriazol-2-yl)-4-tert-butylphenol UV-PS Chemical structure of UV-PS – tert-butyl –
2-(2H-Benzotriazol-2-yl)-4,6-bis(2-phenyl-2-propanyl)phenol UV-234 Chemical structure of UV-234 (2-propanyl)phenol (2-propanyl)phenol –
2-(2H-Benzotriazol-2-yl)-4,6-di-tert-butylphenol UV-320 Chemical structure of UV-320 tert-butyl tert-butyl –
2-(5-Chloro-2H-benzotriazol-2-yl)-4-methyl-6-di-tert-butylphenol UV-326 Chemical structure of UV-326 tert-butyl methyl chlorine
2-(5-Chloro-2H-benzotriazol-2-yl)-4,6-di-tert-butylphenol UV-327 Chemical structure of UV-327 tert-butyl tert-butyl chlorine
2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol UV-328 Chemical structure of UV-328 tert-pentyl tert-pentyl –
2-(2H-Benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol UV-329 Chemical structure of UV-329 – 1,1,3,3-tetramethylbutyl –
2-(2H-Benzotriazol-2-yl)-6-(sec-butyl)-4-(tert-butyl)phenol UV-350 Chemical structure of UV-350 sec-butyl tert-butyl –
2,2′-Methylenbis[6-(2H-benzotriazol-2-yl)-4-(2,4,4-trimethyl-2-pentanyl)phenol] UV-360 Chemical structure of 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 Chemical structure of 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
  1. Entry on UV-Absorber. at: Römpp Online. Georg Thieme Verlag, retrieved 25. Januar 2020.
  2. Entry on 2-(2-Hydroxyphenyl)-2H-benzotriazole. at: Römpp Online. Georg Thieme Verlag, retrieved 25. Januar 2020.
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