[Cl-].[Al+3].[Cl-].[Cl-].[C:5](Cl)(=[O:8])[CH2:6][CH3:7].[C:10]1([CH:16]([CH3:18])[CH3:17])[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1.Cl>O.ClCCCl>[CH:16]([C:10]1[CH:15]=[CH:14][C:13]([C:5](=[O:8])[CH2:6][CH3:7])=[CH:12][CH:11]=1)([CH3:18])[CH3:17]525 ml of 1,2-dichloroethane and 209 g of aluminium chloride are added to a round flask, which is fitted with a stirrer, thermometer, condenser and dropping funnel. The mixture is cooled to 0° C., and 127 g of propionic acid chloride are allowed to drop in at 0°-5° C. within 3/4 hour. After the addition, the temperature is allowed to rise to +18° C. and then 157 g of cumene are added within 2 hours at 30° C. The mixture is left to stand for 12 hours and the product is then poured into a mixture of 800 g of ice, 130 ml of water and 130 ml of concentrated hydrochloric acid. The aqueous phase is separated and extracted with two 250 ml portions of dichloroethane. The combined organic phases are washed with three 200 ml portions of 2% sodium hydroxide and with 250 ml of water. The solvent is removed by evaporation under a vacuum and the residue (244 g) is distilled over a 10 cm column. There are obtained 192.1 g of p-isopropyl-propiophenone (yield: 83.2% of theory). B.p.=76°-77° C./0.15 mmHg; nD20 =1.5150; d420 =0.9645.
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