Carbon Dioxide → 4-(2-Hydroxy-2-methylpropyl)benzoic acid

HRID 713045Notes

Reaction equation

Br[C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]([CH3:12])([OH:11])[CH3:10])=[CH:4][CH:3]=1.C([Li])(C)(C)C.CCCCC.[C:23](=[O:25])=[O:24]>C1COCC1.CCOCC.CCOC(C)=O>[OH:11][C:9]([CH3:12])([CH3:10])[CH2:8][C:5]1[CH:6]=[CH:7][C:2]([C:23]([OH:25])=[O:24])=[CH:3][CH:4]=1

Participants

Conditions

Temperature: -78 °C

Procedure

1-(4-bromophenyl)-2-methyl-propan-2-ol (2.77 g, 12.1 mmol) was dissolved in dry THF (30 mL) and the solution was cooled to −78° C. Tert-butyllithium in pentane (15 mL of 1.7 M, 25.4 mmol) was added dropwise over 10 minutes and the reaction mixture was stirred at −78° C. for 2 hours. The reaction mixture was added via cannula to crushed solid CO2 (53.2 g, 1.21 mol) in Et2O under a flow of nitrogen gas. The reaction mixture was allowed to warm to room temperature, diluted with EtOAc and washed with water. The aqueous phase was acidified (pH 2) with 1N HCl solution and the aqueous layer was extracted with EtOAc. The organics were dried over sodium sulfate, filtered and concentrated in vacuo to give 4-(2-hydroxy-2-methyl-propyl)benzoic acid (620 mg, 26%) as a white solid. ESI-MS m/z calc. 194.0. found 195.3 (M+1)+; Retention time: 0.93 minutes (3 min run).

Workup

additionThe reaction mixture was added via cannula
temperatureto warm to room temperature
washwashed with water
extractionthe aqueous layer was extracted with EtOAc
dry with materialThe organics were dried over sodium sulfate
filtrationfiltered
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-43e6a403c01d40a4bd54868ff5a50db5
Source dataset: uspto-grants-2015_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09181273B2

Reaction notes

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