反应详情

温度

90 °C

2118 ml of concentrated sulphuric acid are added dropwise to 2662 ml of water at room temperature and the solution is heated to 90° C. 355 g (2.23 mol) of 2,4,5-trimethyl-benzyl cyanide are metered into the half-concentrated sulphuric acid at this temperature and the mixture is subsequently stirred at 100° C. for 8 hours. After cooling, the reaction mixture is poured into ice-water, while stirring vigorously, and filtered with suction. The solid is washed several times with water and then with petroleum ether and dried. 358 g (90% of theory) of 2,4,5-trimethyl-phenylacetic acid having a melting point of 123-125° C. are obtained.

1. temperatureAfter cooling
2. stirringwhile stirring vigorously
3. filtrationfiltered with suction
4. washThe solid is washed several times with water
5. dry with materialwith petroleum ether and dried