反应详情

温度

32.5 °C

5,6-O-isopropylidene-L-ascorbic acid was synthesized by the addition of acetyl chloride (124.9 mL) to a slurry of L-ascorbic acid USP (1000 g) in acetone (4.5 L). The mixture was stirred vigorously at 35-30° C. After two hours, the crystalline product separated. The crystals were collected by filtration, washed with cold acetone, and dried in a vacuum desciccator over potassium hydroxide pellets. The product, produced in 77% yield, consisted of needle-shaped crystals with a melting point of 217-223° C.

1. customthe crystalline product separated
2. filtrationThe crystals were collected by filtration
3. washwashed with cold acetone
4. dry with materialdried in a vacuum desciccator over potassium hydroxide pellets
5. customThe product, produced in 77% yield