Reaktion #682961

Reaktionsgleichung

methacrylic acid

1,2-epoxybutane

4-methoxyphenol

potassium hydroxide

→

2-hydroxybutyl methacrylate

Lösungsmittel

NaOH

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeequipped with an addition funnel
2. 2
   Sonstigewas slowly to 75° C.
3. 3
   TemperaturThe mixture was cooled
4. 4
   WaschenThe upper layer was washed with borate buffered saline three times
5. 5
   workup.ADDITIONEthyl ether (200 ml) was added to the combined saline
6. 6
   Extraktionto extract any product
7. 7
   TrocknenThe combined organic layers were dried over NaSO4
8. 8
   FiltrationThe NaSO4 was filtered out
9. 9
   workup.DISTILLATIONthe product was distilled (90-98° C./˜4 mm Hg)
10. 10
    Sonstige17.5 g product was collected, to which
11. 11
    workup.ADDITIONwas added 4 mg 4-methoxyphenol

Vorschrift

A blend of 72 grams 1,2-epoxybutane (Aldrich), 0.85 g 4-methoxyphenol (Aldrich), and 6.5 g potassium hydroxide was stirred in a 500 ml round bottomed flask equipped with an addition funnel and thermocouple thermometer. 172 g methacrylic acid was added via the addition funnel, and the blend was slowly to 75° C., and stirred overnight under an air, then increased to 88° C. for 4 hours. The mixture was cooled, and 700 ml of 2.0 N NaOH was added to the mixture in a separatory funnel. The upper layer was washed with borate buffered saline three times. Ethyl ether (200 ml) was added to the combined saline washes to extract any product. The combined organic layers were dried over NaSO4. The NaSO4 was filtered out and the product was distilled (90-98° C./˜4 mm Hg). 17.5 g product was collected, to which was added 4 mg 4-methoxyphenol. 1H NMR: 6.1 ppm (1H, m), 5.5 (1H, m), 4.8 (0.25H m), 4.2 (0.64H, dd, 8.1 and 11.7 Hz), 4.0 (0.64 Hz, dd, 6.9 and 11.4 Hz), 3.6-3.8 1.26H, m), 2.3 (OH, br s), 1.9 (3 H, m), 1.4-1.7 (2 H, m), 0.9 (3H, m); consistent with a blend of 2-hydroxy-1-propylmethacrylate and 1-hydroxy-2-propylmethacrylate.

Quelle