阿瑞比坦杂质25

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 55 g of hydroquinone and 71.5 g of 3,7-dimethyloctan-3-ol were dissolved in 100 ml of methanol. Then, 50 ml of concentrated sulfuric acid (36 N) was added dropwise thereto under stirring and cooling so as to maintain the temperature at 40° C. or less. Subsequently, the reaction mixture was maintained at 50° to 55° C. for 4 hours. The resulting reaction mixture was added to ice-water, and extracted with 500 ml benzene. The benzene layer was washed with water and, after drying over anhydrous sodium sulfate, benzene and unreacted 3,7-dimethyloctan-3-ol were distilled off under reduced pressure. The residual oil was chromatographed on silica gel using benzene as a developing solvent. Thus, 29.8 g of 2,5-bis(1-ethyl-1,5-dimethylhexyl)hydroquinone (the same compound as obtained in Synthesis Example 1) was first eluted, and then 15.1 g of 2-(1-ethyl-1,5-dimethylhexyl)hydroquinone was eluted. cooling so as to maintain the temperature at 40° C. or less Subsequently, the reaction mixture was maintained at 50° to 55° C. for 4 hours The resulting reaction mixture extracted with 500 ml benzene The benzene layer was washed with water after drying over anhydrous sodium sulfate, benzene and unreacted 3,7-dimethyloctan-3-ol were distilled off under reduced pressure The residual oil was chromatographed on silica gel

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 55 g of hydroquinone and 71.5 g of 3,7-dimethyloctan-3-ol were dissolved in 100 ml of methanol. Then, 50 ml of concentrated sulfuric acid (36 N) was added dropwise thereto under stirring and cooling so as to maintain the temperature at 40° C. or less. Subsequently, the reaction mixture was maintained at 50° to 55° C. for 4 hours. The resulting reaction mixture was added to ice-water, and extracted with 500 ml of benzene. The benzene layer was washed with water and, after drying over anhydrous sodium sulfate, benzene and unreacted 3,7-dimethyloctan-3-ol were distilled off under reduced pressure. The residual oil was chromatographed on silica gel using benzene as a developing solvent. Thus, 29.8 g of 2,5-bis(1-ethyl-1,5-dimethylhexyl)hydroquinone (the same compound as obtained in Synthesis Example 1) was first eluted, and then 15.1 g of 2-(1-ethyl-1,5-dimethylhexyl)hydroquinone was eluted. cooling so as to maintain the temperature at 40° C. or less Subsequently, the reaction mixture was maintained at 50° to 55° C. for 4 hours The resulting reaction mixture extracted with 500 ml of benzene The benzene layer was washed with water after drying over anhydrous sodium sulfate, benzene and unreacted 3,7-dimethyloctan-3-ol were distilled off under reduced pressure The residual oil was chromatographed on silica gel