Reaction equation
[OH-].[Na+].[CH3:3][O:4][C:5]1[C:10]([CH3:11])=[C:9]([CH3:12])[C:8]([O:13][CH3:14])=[C:7]([CH3:15])[C:6]=1[CH:16]([C:29]1[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=1)[CH2:17][CH2:18][CH2:19][CH2:20][C:21]([CH3:28])([CH3:27])[C:22]([O:24]CC)=[O:23]>C(O)C>[CH3:3][O:4][C:5]1[C:10]([CH3:11])=[C:9]([CH3:12])[C:8]([O:13][CH3:14])=[C:7]([CH3:15])[C:6]=1[CH:16]([C:29]1[CH:30]=[CH:31][CH:32]=[CH:33][CH:34]=1)[CH2:17][CH2:18][CH2:19][CH2:20][C:21]([CH3:28])([CH3:27])[C:22]([OH:24])=[O:23]Participants
Conditions
- Temperature
- 90 °C
Procedure
3N Sodium hydroxide (9 ml) was added to a solution of 1.20 g (2.73 mmole) of ethyl 7-(2,5-dimethoxy-3,4,6-trimethylphenyl)-2,2-dimethyl-7-phenylheptanoate in ethanol (12 ml), followed by stirring at 90° C. overnight (15 hours). After cooling by standing at room temperature, the ethanol was distilled off under reduced pressure, and the residue was made acid by adding a 10% aqueous phosphoric acid solution, followed by extraction of the product with isopropyl ether. The isopropyl ether layer was washed with aqueous sodium hydrochloride solution, dried (magnesium suflate) and evaporated to give 1.11 q (99%) of 7-(2,5-dimethoxy-3,4,6-trimethylphenyl)-2,2-dimethyl-7-phenylheptanoic acid. Its typical physical properties and nuclear magnetic resonance spectrum data are shown in Table 14.
Workup
- temperatureAfter cooling
- customby standing at room temperature
- distillationthe ethanol was distilled off under reduced pressure
- additionby adding a 10% aqueous phosphoric acid solution
- extractionfollowed by extraction of the product with isopropyl ether
- washThe isopropyl ether layer was washed with aqueous sodium hydrochloride solution
- dry with materialdried (magnesium suflate)
- customevaporated
Sources & evidence
- ORD record
- ord-159e3818d89848a4bed8302dc9d8b313
- Source dataset
- uspto-grants-1993_01
- Patent number
- US05180742
Linked notes
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