丁基 2-(4-羟基苯氧基)丙酸甲酯

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

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

实验步骤: While stirring a mixture of 25 g of (+)-butyl 2-(4-formylphenoxy)propionate ([α]D25 =+44.1°) and 75 g of toluene at room temperature, 22.8 g of 40% peracetic acid was dropwise added. After the reaction at 50° C. for 2 hours, the reaction mixture was subjected to liquid separation with an addition of water. The toluene layer was separated and washed with water. To the toluene layer, 25 g of sodium hydrogen carbonate and water was added, and the mixture was reacted at 50° C. for 5 hours. Then, the reaction mixture was subjected to liquid separation. The organic layer was washed twice with water. The organic layer was concentrated by distilling off toluene, and then subjected to distillation under reduced pressure, whereby 19.0 g of (+)-butyl 2-(4-hydroxyphenoxy)propionate was obtained as a colorless transparent liquid. The boiling point was 160° C./1 mmHg. After the reaction at 50° C. for 2 hours the reaction mixture was subjected to liquid separation with an addition of water The toluene layer was separated washed with water To the toluene layer, 25 g of sodium hydrogen carbonate and water was added the mixture was reacted at 50° C. for 5 hours Then, the reaction mixture was subjected to liquid separation The organic layer was washed twice with water The organic layer was concentrated by distilling off toluene subjected to distillation under reduced pressure

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

实验步骤: While stirring a mixture of 25 g of butyl 2-(4-formylphenoxy)propionate and 75 g of toluene at room temperature, 22.8 g of 40% peracetic acid was dropwise added. After stirring at 20° to 30° C. for 2 hours and at 50° C. for 2 hours, 2.0 g of water was added, and the mixture was stirred for 2 hours. The reaction mixture was cooled to room temperature and subjected to the same after-treatment as in Example 1, whereby 19.5 g of butyl 2-(4-hydroxyphenoxy)propionate was obtained as a colorless transparent liquid by the distillation under reduced pressure. The boiling point was 160° C./1 mmHg. After stirring at 20° to 30° C. for 2 hours and at 50° C. for 2 hours the mixture was stirred for 2 hours

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

实验步骤: While stirring a mixture of 25 g of butyl 2-(4-formylphenoxy)propionate and 75 g of toluene at room temperature, 22.8 g of 40% peracetic acid was dropwise added. After stirring at 20° to 30° C. for 2 hours and at 50° C. for 2 hours, 2.0 g of water was added, and the mixture was stirred for 2 hours. The reaction mixture was cooled to room temperature and subjected to the same after-treatment as in Example 1, whereby 19.5 g of butyl 2-(4-hydroxyphenoxy)propionate was obtained as a colorless transparent liquid by the distillation under reduced pressure. The boiling point was 160° C./1 mmHg. After stirring at 20° to 30° C. for 2 hours and at 50° C. for 2 hours the mixture was stirred for 2 hours

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

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

实验步骤: 121 g (1.1 moles) of hydroquinone were dissolved in 500 ml of dimethylsulfoxide, 37 g (0.5 mole) of calcium hydroxide were added to the solution, and the mixture was stirred for 1 hour at 45°-50° C. Thereafter, 82.3 g (0.455 mole) of optically active n-butyl 2-chloropropionate (αD20 =-13.0°) were added dropwise in the course of 1 hour at the same temperature. The mixture was stirred for a further 3 hours at 45°-50° C., cooled, and worked up as described in Example 1. 49.7 g (0.21 mole) of optically active n-butyl 2-(4-hydroxyphenoxy)-propionate were obtained. Yield: 46.2%; bp. =150°-152° C./0.22 mbar; αD20 =+11.8° ##STR7## The mixture was stirred for a further 3 hours at 45°-50° C. cooled