反应详情

温度

-10 °C

24.1 g (0.1 mole) of 4-hexyloxy-2,2,6,6-tetramethylpiperidine are dissolved in 100 ml of absolute methylene chloride. To this solution are added 15.2 g (0.15 mole) of absolute triethylamine and the whole solution is cooled to -10° C. At this temperature a solution of 16.8 g (0.1 mole) of phenylglyoxylyl chloride in 100 ml of methylene chloride is slowly added dropwise. When this addition is complete, the reaction mixture is allowed to warm to room temperature and stirred for about 4 hours. Precipitated hydrochloride is removed by filtration and the solution is clarified by filtration over a small amount of silica gel and concentrated by evaporation, affording 28.4 g of 1-(4-hexyloxy-2,2,6,6-tetramethylpiperidino)-2-phenyl-ethane-1,2-dione as a yellow oil (stabiliser 1).

1. additionWhen this addition
2. temperatureto warm to room temperature
3. customPrecipitated hydrochloride is removed by filtration
4. filtrationthe solution is clarified by filtration over a small amount of silica gel
5. concentrationconcentrated by evaporation