Sulfuric Acid → Malonic acid, diethyl-
反応式
[CH2:1]([C:3]([CH2:14][CH3:15])([C:9]([O:11]CC)=[O:10])[C:4]([O:6]CC)=[O:5])[CH3:2].OS(O)(=O)=O>>[CH2:14]([C:3]([CH2:1][CH3:2])([C:9]([OH:11])=[O:10])[C:4]([OH:6])=[O:5])[CH3:15]参加物
3
反応条件
- 温度
- 25 °C
実験手順
The following are weighed into a 2 liter multinecked flask equipped with a stirrer, thermometer, dropping funnel and distilling section: 530 ml of aqueous saturated K2SO4 solution (10% strength, from previous batches), 206 g of KOH flakes (85%, 3.12 mol) and 500 ml of ethanol 95% strength (recovery from previous batches). The mixture is then heated to boiling until a clear solution is obtained. Over a period of 1 h, 270.5 g of diethyl diethylmalonate (1.25 mol) are added dropwise, and over a period of 5-6 hours from 160-180 ml of ethanol are removed by distillation. The batch is cooled. Then, with cooling (to about 25° C.), a 177 g amount of conc. H2SO4 (96% strength, 1.73 mol), which amount beforehand is diluted with about the same amount of H2 O, is added gradually until the pH has dropped to a level of from 1-2.