Methacrylic Acid → 2-Hydroxybutyl methacrylate

Temperature

88 °C

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 (0.64 H, 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 (3H, m), 1.4-1.7 (2H, m), 0.9 (3H, m); consistent with a blend of 2-hydroxy-1-propylmethacrylate and 1-hydroxy-2-propylmethacrylate.

1. customequipped with an addition funnel
2. customwas slowly to 75° C.
3. temperatureThe mixture was cooled
4. washThe upper layer was washed with borate buffered saline three times
5. additionEthyl ether (200 ml) was added to the combined saline
6. extractionto extract any product
7. dry with materialThe combined organic layers were dried over NaSO4
8. filtrationThe NaSO4 was filtered out
9. distillationthe product was distilled (90-98° C./˜4 mm Hg)
10. custom17.5 g product was collected, to which
11. additionwas added 4 mg 4-methoxyphenol

ORD record

ord-18b714417e9d47ae8e41231cc2b46426

Source dataset

uspto-grants-2015_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09125808B2