Acetone → 2,3:4,5-Di-o-isopropylidene-beta-D-fructopyranose

反応式

[OH:1][CH2:2][C:3]([C@H:5]([C@@H:7]([C@@H:9]([CH2:11][OH:12])[OH:10])[OH:8])[OH:6])=[O:4].[CH3:13][C:14]([CH3:16])=O.[CH3:17][CH2:18][CH2:19]CC>O>[CH3:13][C:14]1([CH3:16])[O:6][C@@H:5]2[C@@H:3]([CH2:2][O:1][C@@:9]3([CH2:11][OH:12])[O:10][C:18]([CH3:19])([CH3:17])[O:8][C@H:7]32)[O:4]1

参加物

反応条件

温度: 0 °C

実験手順

A mixture of 200 grams of D-fructose, 2 liters of acetone, 2 liters of pentane and 8 grams of ferric chloride is stirred and heated to reflux temperature. The reaction water is condensed and removed using a Dean-Stark type water separator. After the theoretical amount of water is removed, the mixture is cooled to 0°C., neutralized with 7 grams of sodium hydroxide in 10 milliliters of water and filtered. The filtrate is treated with 10 grams Norite SG, refiltered, and then concentrated to a syrup which is crystallized from ether-pentane to give 164.4 grams of product, m.p. 94°-95°C.