Ethylene Glycol → 2-(3-Bromophenyl)-2-methyl-1,3-dioxolane

HRID 42757

Reaction equation

HRID 42757 reaction equation
N#N.[Br:3][C:4]1[CH:5]=[C:6]([C:10](=[O:12])[CH3:11])[CH:7]=[CH:8][CH:9]=1.[CH2:13](O)[CH2:14][OH:15].COC(OC)OC.C([O-])([O-])=O.[Na+].[Na+]>>[Br:3][C:4]1[CH:5]=[C:6]([C:10]2([CH3:11])[O:15][CH2:14][CH2:13][O:12]2)[CH:7]=[CH:8][CH:9]=1

Participants

6

Reactant 5

HCID 174Ethylene GlycolHCID 947NitrogenHCID 9005Trimethyl orthoformateHCID 10340Sodium CarbonateHCID 165023'-Bromoacetophenone

Product 1

HCID 109992182-(3-Bromophenyl)-2-methyl-1,3-dioxolane

Conditions

Temperature
95 °C

Procedure

In a flame dried round-bottomed flask equipped with a magnetic stir bar and under inert atmosphere (N2), a solution of 1-(3-bromo-phenyl)-ethanone (1360 mg, 6.83 mmol) in ethylene glycol (8.00 mL, 143.46 mmol) was treated with trimethylorthoformate (1.50 mL, 13.68 mmol) followed by LiBF4 (131 mg, 1.37 mmol). The reaction mixture was heated at 95° C. for 15 h. Sat. aq. Na2CO3 was added and the mixture was extracted twice with ether and the combined organic extracts were dried over Na2SO4, filtered, and the solvent was removed under reduced pressure. Purification of the residue by FC (20:1 hept-EA) gave the title compound as a pale yellow oil: TLC:rf (10:1 hept-EA)=0.34. LC-MS-conditions 02: tR=1.01 min.

Workup

  1. extractionthe mixture was extracted twice with ether
  2. dry with materialthe combined organic extracts were dried over Na2SO4
  3. filtrationfiltered
  4. customthe solvent was removed under reduced pressure
  5. customPurification of the residue by FC (20:1 hept-EA)

Sources & evidence

ORD record
ord-2395729cc9094f8db19164bab0b1ef65
Source dataset
uspto-grants-2013_09
Patent number
US08536209B2

Linked notes

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