2-Butene-1,4-diol → 1,4-Bis(4-methoxybenzyloxy)but-2-ene

HRID 1089255

Reaktionsgleichung

Reaktionsgleichung von HRID 1089255
[CH2:1]([OH:6])[CH:2]=[CH:3][CH2:4][OH:5].[H-].[Na+].[CH3:9][O:10][C:11]1[CH:18]=[CH:17][C:14]([CH2:15]Cl)=[CH:13][CH:12]=1>CN(C)C=O>[CH3:9][O:10][C:11]1[CH:18]=[CH:17][C:14]([CH2:15][O:5][CH2:4][CH:3]=[CH:2][CH2:1][O:6][CH2:15][C:14]2[CH:17]=[CH:18][C:11]([O:10][CH3:9])=[CH:12][CH:13]=2)=[CH:13][CH:12]=1

Komponenten

5

Edukt 3

HCID 80652-Butene-1,4-diolHCID 24758Sodium hydrideHCID 699934-Methyloxybenzyl chloride

Produkt 1

HCID 545551371,4-Bis(4-methoxybenzyloxy)but-2-eneAusbeute 70 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228DimethylformamideLösungsmittel2×

Versuchsvorschrift

To a solution of 2-buten-1,4-diol (4.9 g, 60 mmol) in dry dimethylformamide (120 ml) was added sodium hydride (60% dispersion in oil; 5.28 g, 132 mmol) and the mixture was stirred at room temperature for 100 minutes. To this solution was added 4-methoxybenzyl chloride (17.9 ml, 132 mmol) in dimethylformamide (30 ml) dropwise over 45 minutes and the mixture was stirred for a further 40 minutes. The mixture was partitioned between ether (150 ml) and water (150 ml). The organic layer was further washed with water (150 ml), dried (magnesium sulphate) and the solvent was removed. The residue was purified by column chromatography on silica gel eluting with hexane-acetone (4:1, 3:1) to afford 1,4-bis(4-methoxybenzyloxy)but-2-ene as a clear colourless liquid (13.7 g, 70%). IR: υmax (film) 2840, 1615, 1515 and 1250 cm-1. 1H NMR: δH (CDCl3) 3.80 (6H, s, 2×CH3), 4.02 (4H, d, J=4.5 Hz, 2×CHCH2), 4.43 (4H, s, 2×ArCH2), 5.79 (2H, t, J=4.5 Hz, 2×CH), 6.88 (4H, d, J=9 Hz, ArH) and 7.27 (4H, d, J=9 Hz, ArH).

Aufarbeitung

  1. stirringthe mixture was stirred for a further 40 minutes
  2. customThe mixture was partitioned between ether (150 ml) and water (150 ml)
  3. washThe organic layer was further washed with water (150 ml)
  4. dry with materialdried (magnesium sulphate)
  5. customthe solvent was removed
  6. customThe residue was purified by column chromatography on silica gel eluting with hexane-acetone (4:1, 3:1)

Quellen und Nachweise

ORD-Eintrag
ord-7012a792d1d44d4a9d86aaa7bc5c10f1
Quelldatensatz
uspto-grants-1990_10
Patentnummer
US04965270

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