反应详情

温度

120 °C

A mixture of 55.3 grams (0.2 mol) of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 2.8 grams of molybdenum trioxide and 250 ml of n-octane is heated to 120° C. A solution of 90.2 grams (0.7 mol) of 70% aqueous tert-butyl hydroperoxide is added dropwise to the hot reaction mixture. Water is removed by azeotropic distillation and collected in a Dean-Stark trap. The reaction mixture is heated at reflux till the red color of the intermediate N-oxyl compound disappears. Solids are removed by filtration, and the filtrate is concentrated under vacuum to give an oil. Purification of the oil by flash chromatography on silica gel (100:3 heptane: ethyl acetate) affords 4-benzoyloxy-1-octyloxy-2,2,6,6-tetramethylpiperidine as a mixture of octyloxy isomers. Further elution of the chromatographic column with 50:3 heptane:ethyl acetate affords the title compound as a mixture of octanediyl isomers.

1. customWater is removed by azeotropic distillation
2. customcollected in a Dean-Stark trap
3. temperatureThe reaction mixture is heated
4. temperatureat reflux till the red color of the intermediate N-oxyl compound
5. customSolids are removed by filtration
6. concentrationthe filtrate is concentrated under vacuum
7. customto give an oil
8. customPurification of the oil by flash chromatography on silica gel (100:3 heptane: ethyl acetate)