Reaktion #740346

Reaktionsgleichung

2-(2-hydroxy-5-methylphenyl)-2H-benzotriazole

methanesulfonic acid

n-dodecene

→

2-(2-Hydroxy-3-tetracosyl-5-methylphenyl)-2H-benzotriazole

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe reaction mixture is cooled
2. 2
   Sonstigethe product isolated by the general procedure
3. 3
   SonstigeThe excess hydrocarbons are removed by distillation at 190° C./0.04 mm
4. 4
   SonstigeThe above-named product is obtained in a yield of 103.6 grams as a yellow liquid
5. 5
   SonstigeThe liquid still contained inert hydrocarbon diluents which are removed by flash chromatography
6. 6
   Sonstigeto give a pure product in a yield of 15 grams as a yellow liquid

Vorschrift

Using the general procedure of Example 1, 112 grams of 2-(2-hydroxy-5-methylphenyl)-2H-benzotriazole, 33 ml of methanesulfonic acid and 444 ml (2 moles) of a mixture of tetracosenes (prepared by the dimerization of n-dodecene) are heated at 160° C. for 96 hours. The reaction mixture is cooled and the product isolated by the general procedure described in Example 1. The excess hydrocarbons are removed by distillation at 190° C./0.04 mm. The above-named product is obtained in a yield of 103.6 grams as a yellow liquid. The liquid still contained inert hydrocarbon diluents which are removed by flash chromatography using silica gel and heptane/toluene 75/25 to give a pure product in a yield of 15 grams as a yellow liquid.

Quelle