反応 #71534

反応方程式

(R)-2-chloromandelic acid

sulfuric acid

methanol

→

Methyl-(R)-2-hydroxy-2-(2-chlorophenyl)acetate

収率 94.0%

反応条件

後処理

1. 1
   温度heated
2. 2
   温度to reflux, till completion of reaction
3. 3
   workup.DISTILLATIONThen excess of methanol was distilled off under reduced pressure
4. 4
   洗浄washed with aqueous sodium bicarbonate solution
5. 5
   workup.DISTILLATIONDichloromethane was distilled under reduced pressure

実験手順

In a four necked round bottomed flask, 500 gm of (R)-2-chloromandelic acid was taken in 2600 ml methanol. Then 18.8 gm of sulfuric acid was added and heated to reflux, till completion of reaction. Then excess of methanol was distilled off under reduced pressure. Residue was taken in dichloromethane and washed with aqueous sodium bicarbonate solution. Dichloromethane was distilled under reduced pressure to obtain 522 gm of Methyl-(R)-2-hydroxy-2-(2-chlorophenyl)acetate as an oil. Yield: 94%. Purity: 98.5%

出典