Methyl iodide → 2-Bromo-5-methoxy-1,3-dimethylbenzene

HRID 2425822Notes

Reaction equation

[Br:1][C:2]1[C:7]([CH3:8])=[CH:6][C:5]([OH:9])=[CH:4][C:3]=1[CH3:10].[C:11](=O)([O-])[O-].[K+].[K+].CI>CC(C)=O>[Br:1][C:2]1[C:7]([CH3:8])=[CH:6][C:5]([O:9][CH3:11])=[CH:4][C:3]=1[CH3:10]

Participants

Conditions

Temperature: 65 °C

Procedure

To a mixture of 4-bromo-3,5-dimethyl-phenol (40.2 g, 0.200 mol) and potassium carbonate (55.2 g, 0.400 mol) in acetone (200 mL) was added methyl iodide (24.9 mL, 0.600 mol) at room temperature under N2. The reaction mixture was then refluxed at 65° C. for 8 h. After cooling to room temperature, the mixture was filtered, and the filtrate was concentrated in vacuo. The resulting clear liquid was distilled under reduced pressure (70° C./0.1 Torr) to give 42.4 g (99%) of title compound as a colorless liquid. 1H NMR (400 MHz, CDCl3): δ 6.663 (s, 2H), 3.778 (s, 3H), 2.402 (s, 6H); 13C NMR (100 MHz, CDCl3): δ 158.165, 139.203, 118.357, 113.953, 55.520, 24.319. MS (EI): m/z 214 [M+, 79Br 100], 216 [M+, 79Br, 96].

Workup

temperatureAfter cooling to room temperature
filtrationthe mixture was filtered
concentrationthe filtrate was concentrated in vacuo
distillationThe resulting clear liquid was distilled under reduced pressure (70° C./0.1 Torr)

Sources & evidence

ORD record: ord-f42b26049b734b0a89274adb635c91b2
Source dataset: uspto-grants-2011_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07968016B2

Reaction notes

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