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UV-320 structure
UV-320 structure


Iupac Name:2-(benzotriazol-2-yl)-4,6-ditert-butylphenol
CAS No.: 3846-71-7
Molecular Weight:323.43200
Modify Date.: 2022-11-29 11:56

UV-320 is an efficient light stabilizer, widely used in plastics and other organic materials, including unsaturated polyester, PVC, PVC plasticizing, etc., in polyurethane, polyamide, synthetic fibers, especially poly In the application of grease and epoxy resin. Used in plastics and other organic materials, such as unsaturated polyester, PVC, PVC plasticizing, etc.

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1. Names and Identifiers
1.1 Name
1.2 Synonyms

2-(2′-Hydroxy-3′,5′-di-t-butylphenyl)benzotriazole 2-(2′-Hydroxy-3′,5′-di-tert-butylphenyl)benzotriazole 2-(2′-Hydroxy-3′5-di-tert-butylphenyl) benzotriazole 2-(2-Benzotriazolyl)-4,6-di-tert-butylphenol 2-(2H-Benzo[d][1,2,3]triazol-2-yl)-4,6-di-tert-butylphenol 2-(2H-Benzotriazol-2-yl)-4,6-bis(1,1-dimethylethyl)phenol 2-(2-Hydroxy-3,5-di-tert-butylphenyl)-2H-benzotriazole 2-(2-Hydroxy-3,5-di-tert-butylphenyl)benzotriazole 2-(3,5-Di-t-butyl-2-hydroxyphenyl)benzotriazole 2-(3,5-Di-tert-butyl-2-hydroxyphenyl)-2H-benzotriazole 2-(3,5-Di-tert-butyl-2-hydroxyphenyl)benzotriazole 2-(3′,5′-Di-tert-butyl-2′-hydroxyphenyl)benzotriazole 2-(Benzotriazol-2-yl)-4,6-ditert-butylphenol 2-Benzotriazole-2-yl-4 3,5-Dibutylhy-2-droxyphenylbenzotriazole 4,6-Di-tert-butyl-2-(2H-benzotriazole-2-yl)phenol 6-di-tert-butylphenol Chisorb 320 Eversorb 77 HDBB Kemisorb 75 Phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylethyl)- Phenol, 2-(2H-benzotriazol-2-yl)-4,6-di-tert-butyl- Phenol,2-(2H-benzotriazol-2-yl)-4,6-di-tert-butyl- (7CI,8CI) Seesorb 705 Sumisorb 320 Tinuvin 320 UV 320 uv absorber uv-320 Viosorb 582

1.3 CAS No.
1.4 CID
1.6 Molecular Formula
C20H25N3O (isomer)
1.7 Inchi
1.8 InChkey
1.9 Canonical Smiles
1.10 Isomers Smiles
2. Properties
2.1 Density
2.1 Melting point
2.1 Boiling point
444ºC at 760mmHg
2.1 Refractive index
2.1 Flash Point
2.1 Precise Quality
2.1 PSA
2.1 logP
2.1 pKa
2.2 Water Solubility
3. Use and Manufacturing
3.1 Methods of Manufacturing
2-(2-Hydroxy-3, 5-di-tert-butylphenyl)-2H-benzotriazole When using the general procedure of Example 5, a 23percent by weight suspension of 2-nitro-2'-hydroxy-3', 5'-di-tert-butylazobenzene in isopropanol/triethylamine (1/0.18) was hydrogenated at 45° C. at 1 atmosphere pressure for 3 hours in the presence of 3percent of a 5percent palladium on charcoal catalyst the above noted product was obtained in a yield of 77percent.EXAMPLE 3 35.5 g (0.1 mol) of 2-nitro-2'-hydroxy-3', 5'-di-t-butylazobenzene, 0.125 g of 5percent palladium carbon, 100 ml of toluene, 100 ml of IPA, 100 ml water and 8.3 g of caustic soda were charged into a 500-ml stainless autoclave equipped with an agitator. After the air in the autoclave had been replaced by hydrogen, the pressure of hydrogen was set to 10 kg/cm2. Reaction was effected in the same way as that employed in Example 1. After the reaction had been completed, the catalyst was filtered off. When part of the filtrate was subjected to quantitative analysis using GC, it was found that the yield of 2-(2'-hydroxy-3', 5'-di-t-butylphenyl)benzotriazole is 82percent. After the solvent had been distilled off from the filtrate, the residual solid was crystallized by IPA, washed with IPA and then dried to obtain 23.6 g of 2-(2'-hydroxy-3', 5'-di-t-butylphenyl)benzotriazole (yield, 73percent; melting point, 150°to 152° C.).EXAMPLE 10 2-Nitro-2'-hydroxy-3', 5'-di-tert.-butyl-azobenzene is reacted, according to Example 8, to give 2-(2'-hydroxy-3', 5'-di-tert.-butyl-phenyl)-benzotriazole in a yield of 70percent of theory.EXAMPLE 17 2-(2-Hydroxy-3, 5-di-tert-butylphenyl)-2H-benzotriazole When using the general procedure of Example 1, a 22percent by weight suspension of 2-nitro-2'-hydroxy-3', 5'-di-tert-butylazobenzene in isopropanol/triethylamine (1/0.18) was hydrogenated at 45° C. in the presence of a Raney nickel catalyst (6percent by weight based on the azobenzene intermediate) for a period of 13 hours, the above named compound was obtained in a 67percent yield. When the amount of catalyst above was increased to 20percent by weight based on the azobenzene, the hydrogenation was completed in 1.1 hour at 45° C. to give a 75percent yield of product.
4. Safety and Handling
4.1 Risk Statements
R48/22; R52/53
4.1 Safety Statements
4.1 Hazard Declaration
4.1 Caution Statement
P260, P264, P270, P314, P501
4.1 Safety

Risk Statements: 48/22-52/53
R48/22:Harmful: danger of serious damage to health by prolonged exposure if swallowed. 
R52/53:Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 26-36/37/39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.

4.2 Specification

 UV-320 ,its cas register number is 3846-71-7. It also can be called 2-(2H-benzotriazol-2-yl)-4,6-di-tert-butylphenol ; 2-(3,5-Di-tert-butyl-2-hydroxyphenyl)-2H-benzotriazole and 2-(2'-Hydroxy-3',5'-di-tert-butylphenyl)benzotriazole .


2.Hazard identification

2.1 Classification of the substance or mixture

Carcinogenicity, Category 2

Specific target organ toxicity \u2013 repeated exposure, Category 2

Hazardous to the aquatic environment, long-term (Chronic) - Category Chronic 3

2.2 GHS label elements, including precautionary statements

Signal word


Hazard statement(s)

H351 Suspected of causing cancer

H373 May cause damage to organs through prolonged or repeated exposure

H412 Harmful to aquatic life with long lasting effects

Precautionary statement(s)

P201 Obtain special instructions before use.

P202 Do not handle until all safety precautions have been read and understood.

P280 Wear protective gloves/protective clothing/eye protection/face protection.

P260 Do not breathe dust/fume/gas/mist/vapours/spray.

P273 Avoid release to the environment.


P308+P313 IF exposed or concerned: Get medical advice/ attention.

P314 Get medical advice/attention if you feel unwell.


P405 Store locked up.


P501 Dispose of contents/container to ...

2.3 Other hazards which do not result in classification


8. Other Information
8.0 Biological Half Life
7.76 Days
8.1 Mesh Entry Terms
2-(2'-hydroxy-3',5'-di-tert-butylphenyl) benzotriazole
8.2 Manufacturing Info
Phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylethyl)-: ACTIVE
9. Computational chemical data
  • Molecular Weight: 323.43200g/mol
  • Molecular Formula: C20H25N3O
  • Compound Is Canonicalized: True
  • XLogP3-AA: null
  • Exact Mass: 323.199762429
  • Monoisotopic Mass: 323.199762429
  • Complexity: 425
  • Rotatable Bond Count: 3
  • Hydrogen Bond Donor Count: 1
  • Hydrogen Bond Acceptor Count: 3
  • Topological Polar Surface Area: 50.9
  • Heavy Atom Count: 24
  • Defined Atom Stereocenter Count: 0
  • Undefined Atom Stereocenter Count: 0
  • Defined Bond Stereocenter Count: 0
  • Undefined Bond Stereocenter Count: 0
  • Isotope Atom Count: 0
  • Covalently-Bonded Unit Count: 1
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11. Realated Product Infomation