تفاعل #445321

معادلة التفاعل

acetone

D-mannitol

hydriodic acid

→

1,2:3,4:5,6-tri-O-isopropylidene-D-mannitol

المردود 90.0%

المذيبات

pyridine

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةthe mixture was refluxed
2. 2
   أخرىDuring this reaction
3. 3
   تجفيفthe refluxing solvent was dried with 20 g of Molecular Sieves 3A
4. 4
   أخرىAfter completion of the reaction
5. 5
   workup.DISTILLATIONThe acetone was then distilled off under reduced pressure
6. 6
   workup.DISSOLUTIONthe residue was dissolved in chloroform
7. 7
   غسيلThe solution was washed with aqueous sodium bicarbonate and water
8. 8
   تجفيفdried over anhydrous magnesium sulfate
9. 9
   workup.DISTILLATIONThe chloroform was distilled off under reduced pressure

الإجراء التجريبي

To 200 ml of acetone were added 10.0 g of D-mannitol and 175 mg of hydriodic acid (57%) and the mixture was refluxed with stirring in a water bath at 60° C. for 5 hours. During this reaction, the refluxing solvent was dried with 20 g of Molecular Sieves 3A interposed between the reaction vessel and the cooling jacket. After completion of the reaction, a small amount of pyridine was added. The acetone was then distilled off under reduced pressure and the residue was dissolved in chloroform. The solution was washed with aqueous sodium bicarbonate and water and dried over anhydrous magnesium sulfate. The chloroform was distilled off under reduced pressure to give 15.0 g (90%) of 1,2:3,4:5,6-tri-O-isopropylidene-D-mannitol. After recrystallization from 70% ethanol, it melted at 68.5°-70.5° C.

المصدر