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Basic Information
CAS No.: 3147-75-9
Name: Octrizole
Article Data: 26
Molecular Structure:
Molecular Structure of 3147-75-9 (Octrizole)
Formula: C20H25N3O
Molecular Weight: 323.438
Synonyms: 2-(2'-Hydroxy-5'-t-octylphenyl)benzotriazole;Octrizole [USAN:INN];Phenol, 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)-;UV Absorber-5;2-(2'-Hydroxy-5'-(1,1,3,3-tetramethylbutyl)phenyl)benzotriazole;2-(2'-Hydroxy-5'-tert-octylphenyl)benzotriazole;2-(2-Hydroxy-5-t-octylphenyl)-2H-benzotriazole;2-(2H-Benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol;2-(5'-tert-Octyl-2'-hydroxyphenyl)benzotriazole;2-(5-t-Octyl-2-hydroxyphenyl)benzotriazole;2-Benzotriazolyl-4-tert-octylphenol;Cyasorb 5411;Cyasorb UV 5411;Octrizo;Octrizol [INN-Spanish];2-(2-Hydroxy-5-tert-octylphenyl)benzotriazole;Seesorb 709;Spectra-Sorb UV 5411;Sumisorb 340;UNII-R775Y233N3;Viosorb 583;
EINECS: 221-573-5
Density: 1.1 g/cm3
Melting Point: 101-108 °C
Boiling Point: 471.8 °C at 760 mmHg
Flash Point: 239.2 °C
Solubility: 2μg/L at 20℃
Appearance: Slightly yellowish powder
Hazard Symbols: IrritantXi
Risk Codes: 36/37/38
Safety: 26-37/39
PSA: 50.94000
LogP: 4.83990
Synthetic route

C20H25N3O2

3147-75-9

Cyasorb UV 5411

Conditions
ConditionsYield
In isopropyl alcohol at 80 - 82℃; for 4h;97.5%
51656-57-6

2-(2'-hydroxy-5'-tert-octylphenyl)nitrodiazobenzene

3147-75-9

Cyasorb UV 5411

Conditions
ConditionsYield
With methanol; Aminoiminomethanesulfinic acid; sodium hydroxide In toluene at 50 - 80℃; for 0.5h; Reagent/catalyst; Solvent; Temperature;96.4%
With sodium hydroxide; zinc In water; Petroleum ether at 50℃; for 5h;
51656-57-6

2-(2-Nitro-phenylazo)-4-(1,1,3,3-tetramethyl-butyl)-phenol

3147-75-9

Cyasorb UV 5411

Conditions
ConditionsYield
With sodium hydroxide; thiourea S,S-dioxide In water; isopropyl alcohol for 3h; Heating;96%

2-nitro-2-hydroxy-5-tert-octyl-azobenzene

3147-75-9

Cyasorb UV 5411

Conditions
ConditionsYield
93%
88-74-4

2-nitro-aniline

140-66-9

tert-octylphenol

3147-75-9

Cyasorb UV 5411

Conditions
ConditionsYield
Stage #1: 2-nitro-aniline With sulfuric acid In water for 0.333333h;
Stage #2: With sodium nitrite In water at 0℃; for 2.5h; Cooling with ice;
Stage #3: tert-octylphenol Further stages;
90.01%
Multi-step reaction with 2 steps
1.1: sodium nitrite; hydrogenchloride / water / -15 - 5 °C
1.2: 2 h / 0 °C
2.1: zinc; sodium hydroxide / water; Petroleum ether / 5 h / 50 °C
View Scheme

C20H25N3O2

3147-75-9

Cyasorb UV 5411

Conditions
ConditionsYield
With hydrogenchloride In water; toluene at 70℃; for 2h; Concentration; Temperature; Reagent/catalyst;89.5%
With hydrogenchloride; zinc In toluene Reflux;88.2%

2-nitro-2'-hydroxy-5'-tert-octylazobenzene

27959-42-8

2-nitro-2'-hydroxy-5'-tert-butylazobenzene

3147-75-9

Cyasorb UV 5411

Conditions
ConditionsYield
85%
85%

2-nitro-2'-hydroxy-5'-tert-octylazobenzene

2-Nitro-2'-hydroxy-3',5'-di-tert-pentyl-azobenzene

3147-75-9

Cyasorb UV 5411

Conditions
ConditionsYield
83.7%

2-nitro-2'-hydroxy-5'-tert-octylazobenzene

3147-75-9

Cyasorb UV 5411

Conditions
ConditionsYield
With dimethyl amine; palladium-carbon In water; toluene82.9%

2-nitro-2'-hydroxy-5'-tert-octylazobenzene

486-25-9

9-fluorenone

3147-75-9

Cyasorb UV 5411

Conditions
ConditionsYield
With sodium hydroxide; sulfuric acid; paraformaldehyde In methanol; water
With sodium hydroxide; sulfuric acid; paraformaldehyde In methanol; water
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Chemistry

Molecular Structure:

IUPAC Name:  2-(Benzotriazol-2-yl)-4-(2,4,4-trimethylpentan-2-yl)phenol
Synonyms of 2-(2-Hydroxy-5-tert-octylphenyl)benzotriazole (CAS NO.3147-75-9): 2-(2'-Hydroxy-5'-t-octylphenyl)benzotriazole ; Octrizole [USAN:INN] ; Phenol, 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)- ; UV Absorber-5 ; 2-(2'-Hydroxy-5'-(1,1,3,3-tetramethylbutyl)phenyl)benzotriazole ; 2-(2'-Hydroxy-5'-tert-octylphenyl)benzotriazole ; 2-(2'-Hydroxy-5'-tert-octylphenyl)benztriazole;  2-(2-Hydroxy-5-t-octylphenyl)-2H-benzotriazole;  2-(2-Hydroxy-5-tert-octylphenyl)-2H-benzotriazole ; 2-(2H-Benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol ; 2-(5'-tert-Octyl-2'-hydroxyphenyl)benzotriazole ; 2-(5-t-Octyl-2-hydroxyphenyl)benzotriazole ; 2-Benzotriazolyl-4-tert-octylphenol ; Cyasorb 5411 ; Cyasorb UV 5411 ; EINECS 221-573-5 ; Octrizol ; Octrizol [INN-Spanish] ; Octrizole ; Octrizolum ; Octrizolum [INN-Latin] ; Seesorb 709 ; Spectra-Sorb UV 5411 ; Sumisorb 340 ; Tinuvin 329 ; UNII-R775Y233N3 ; Viosorb 583 ; UV-329 
Registry Number: 3147-75-9 
Deleted Registry Number(s): 123307-21-1 
Molecular Formula: C20H25N3O  
Molecular Weight: 323.432
H bond acceptors: 4
H bond donors: 1
Freely Rotating Bonds: 5
Polar Surface Area: 39.94 Å2
Index of Refraction: 1.584
Molar Refractivity: 98.12 cm3
Molar Volume: 292.8 cm
Surface Tension: 39.3 dyne/cm
Density: 1.1 g/cm3
Flash Point: 239.2 °C
Enthalpy of Vaporization: 76.27 kJ/mol
Boiling Point: 471.8 °C at 760 mmHg
Vapour Pressure: 1.58E-09 mmHg at 25°C 

Uses

 2-(2-Hydroxy-5-tert-octylphenyl)benzotriazole (CAS NO.3147-75-9) is used as polystyrene, poly methyl methacrylate, polyester, rigid PVC, polycarbonate, ABS resin, etc.

Safety Profile

Hazard Codes: XiIrritant
Risk Statements of 2-(2-Hydroxy-5-tert-octylphenyl)benzotriazole (CAS NO.3147-75-9): 36/37/38
R36/37/38: Irritating to eyes, respiratory system and skin.
Safety Statements: 26-37/39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39: Wear suitable gloves and eye/face protection.
WGK Germany: 1