Cumene → 4-Chloro-4'-isopropylbutyrophenone

HRID 413516

Reaction equation

[Cl-].[Al+3].[Cl-].[Cl-].[Cl:5][CH2:6][CH2:7][CH2:8][C:9](Cl)=[O:10].[C:12]1([CH:18]([CH3:20])[CH3:19])[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1>C(Cl)Cl>[Cl:5][CH2:6][CH2:7][CH2:8][C:9]([C:15]1[CH:16]=[CH:17][C:12]([CH:18]([CH3:20])[CH3:19])=[CH:13][CH:14]=1)=[O:10]

Participants

Conditions

Temperature: 6.5 °C

Procedure

Slurry aluminum chloride (140.9 g, 1.075 mol) and 4-chlorobutyryl chloride (148 g, 1.05 mol) in methylene chloride (1.0L) add, by dropwise addition, cumene (125 g, 1.04 mol) over a thirty minute period under a nitrogen atmosphere while maintaining the internal temperature between 5-8° C. with an ice bath. Allow the stirred solution to come to room temperature and continue stirring under nitrogen for 14 hours. Cautiously add the methylene chloride solution to 1L of crushed ice with stirring and add additional methylene chloride (400 mL). Separate the organic phase and wash with 10% hydrochloric acid (3×300 mL), water (3×300 mL), 10% sodium bicarbonate (33×300 mL) and water (3×300 mL). Dry (MgSO4), filter and wash with methylene chloride (150 mL). Evaporate the solvent to give the title compound (203 g, 86%) as a clear oil which crystallizes on standing; mp 35-37° C.

Workup

customto come to room temperature
stirringwith stirring
customSeparate the organic phase
washwash with 10% hydrochloric acid (3×300 mL), water (3×300 mL), 10% sodium bicarbonate (33×300 mL) and water (3×300 mL)
dry with materialDry (MgSO4)
filtrationfilter
washwash with methylene chloride (150 mL)
customEvaporate the solvent

Sources & evidence

ORD record: ord-8a5f566d56054027b32530f0941fed97
Source dataset: uspto-grants-2003_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06566526B2

Linked notes

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