Reaction equation
[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[F:8][C:9]1[CH:14]=[CH:13][C:12]([C:15]2(O)[CH2:20][CH2:19][C:18](=[O:21])[CH2:17][CH2:16]2)=[CH:11][CH:10]=1.[Cl-].[Al+3].[Cl-].[Cl-].Cl>>[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:15]2([C:12]3[CH:13]=[CH:14][C:9]([F:8])=[CH:10][CH:11]=3)[CH2:20][CH2:19][C:18](=[O:21])[CH2:17][CH2:16]2)=[CH:4][CH:3]=1Participants
Procedure
To a stirred and cooled (ice-bath) mixture of 50 parts of fluorobenzene and 4.1 parts of 4-(4-fluorophenyl)-4-hydroxycyclohexanone were added portionwise 11 parts of aluminium chloride. Upon completion, stirring was continued for 2 hours while still cooling. The reaction mixture was decomposed by pouring onto a mixture of crushed ice and a hydrochloric acid solution. The product was extracted with methylbenzene. The extract was washed with water till neutralization, dried, filtered and evaporated. The residue was purified by column-chromatography over silica gel using trichloromethane as eluent. The pure fractions were collected and the eluent was evaporated, yielding 4.3 parts (75.9%) of 4,4-bis(4-fluorophenyl)-1-cyclohexanone as a residue (intermediate 19).
Workup
- temperaturecooled
- stirringUpon completion, stirring
- temperaturewhile still cooling
- additionby pouring onto a mixture of crushed ice
- extractionThe product was extracted with methylbenzene
- washThe extract was washed with water till neutralization,
- customdried
- filtrationfiltered
- customevaporated
- customThe residue was purified by column-chromatography over silica gel
- customThe pure fractions were collected
- customthe eluent was evaporated
Sources & evidence
- ORD record
- ord-1154f6862b354bcc8357c14211d3a48c
- Source dataset
- uspto-grants-1988_08
- Patent number
- US04766125
Linked notes
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