Azobisisobutyronitrile → 2-(2'-Hydroxy-3'-tert-butyl-5'-bromomethylphenyl)-5-chlorobenzotriazole

HRID 429988Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 429988
[OH:1][C:2]1[C:7]([C:8]([CH3:11])([CH3:10])[CH3:9])=[CH:6][C:5]([CH3:12])=[CH:4][C:3]=1[N:13]1[N:17]=[C:16]2[CH:18]=[CH:19][C:20]([Cl:22])=[CH:21][C:15]2=[N:14]1.N(C(C)(C)C#N)=NC(C)(C)C#N.[Br:35]Br>C(Cl)(Cl)(Cl)Cl>[OH:1][C:2]1[C:7]([C:8]([CH3:9])([CH3:11])[CH3:10])=[CH:6][C:5]([CH2:12][Br:35])=[CH:4][C:3]=1[N:13]1[N:17]=[C:16]2[CH:18]=[CH:19][C:20]([Cl:22])=[CH:21][C:15]2=[N:14]1

Komponenten

5

Edukt 3

HCID 6547Azobisisobutyronitrile2×HCID 24408BromineHCID 62531Tinuvin3×

Produkt 1

HCID 155381112-(2'-Hydroxy-3'-tert-butyl-5'-bromomethylphenyl)-5-chlorobenzotriazole

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 5943Carbon TetrachlorideLösungsmittel2×

Versuchsvorschrift

2-(2′-hydroxy-3′-tert-butyl-5′-bromomethyphenyl)-5-chlorobenzotriazole was prepared from the bromination of 2-(2′-hydroxy-3′-tert-butyl-5′-methyphenyl)-5-chlorobenzotriazole using azobis isobutyronitrile (AIBN) as an initiator. In a 500 ml three-necked round bottomed flask, 7.042 g (0.0223 mol) 2-(2′-hydroxy-3′-tert-butyl-5′-methyphenyl)-5-chlorobenzotriazole and 100 mg of AIBN were taken and dissolved in 150 ml of dry carbon tetrachloride. In a separate conical flask 4.18 g (1.5 ml, 0.03 mol) of bromine was dissolved in 75 ml of dry carbon tetrachloride and solution was transferred to a cylindrical funnel with pressure equalizing tube. Three-necked round-bottomed flask containing solution of 2-(2′-hydroxy-3′-tert-butyl-5′-methyphenyl)-5-chlorobenzotriazole was kept in oil-bath with temperature 50° C. Nitrogen was bubbled through the solution for creating inert atmosphere. Cylindrical funnel containing bromine solution was mounted on the three-necked round-bottomed flask. Solution in the flask was continuously stirred with the help of magnetic stirrer. Bromine solution was added, drop-by-drop from funnel to the flask for a span of 4-5 hours till all the solution was poured out. After that heating was stopped and the final reaction mixture was allowed to cool at room temperature. Product was separated by solvent evaporation. Finally the product was purified by recrystallization from acetone. The yield of 2-(2′-hydroxy3′-tert-butyl-5′-bromomethyphenyl)-5-chlorobenzotriazole was 7.2 g (81%).

Aufarbeitung

  1. customsolution was transferred to a cylindrical funnel with pressure
  2. customwas kept in oil-bath with temperature 50° C
  3. customNitrogen was bubbled through the solution
  4. additionCylindrical funnel containing bromine solution
  5. additionBromine solution was added, drop-by-drop from funnel to the flask for a span of 4-5 hours till all the solution
  6. additionwas poured out
  7. customthe final reaction mixture
  8. customProduct was separated by solvent evaporation
  9. customFinally the product was purified by recrystallization from acetone

Quellen und Nachweise

ORD-Eintrag
ord-925a4814b3534149b587645580addf15
Quelldatensatz
uspto-grants-2001_11
Patentnummer
US06320056B1

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