تفاعل #1786977

معادلة التفاعل

hexaethylene glycol

4,4-dimethoxytrityl chloride

→

4,4-dimethoxytrityl-hexaethylene glycol

المردود 89.1%

المذيبات

pyridine

pyridine

ظروف التفاعل

المعالجة

1. 1
   أخرىThe solvent was then evaporated to dryness
2. 2
   استخلاصthe residue was extracted with 200 ml ethylacetate/200 ml 5% sodium bicarbonate solution
3. 3
   غسيلwashed twice with water and twice with brine solution
4. 4
   تجفيفThe obtained organic layer was dried over anhydrous sodium sulfate
5. 5
   أخرىevaporated
6. 6
   أخرىpurified by silica gel column chromatography

الإجراء التجريبي

To a solution of hexaethylene glycol (8.46 grams, 30 mmoles) in 250 ml dry pyridine, a solution of 4,4-dimethoxytrityl chloride (3.38 grams, 10 mmoles) in 50 ml dry pyridine was added dropwise at room temperature. The resulting solution was stirred at room temperature for additional 5 hours. The solvent was then evaporated to dryness, and the residue was extracted with 200 ml ethylacetate/200 ml 5% sodium bicarbonate solution, washed twice with water and twice with brine solution. The obtained organic layer was dried over anhydrous sodium sulfate, evaporated and purified by silica gel column chromatography using 5% methanol in dichloromethane, 0.5% pyridine. The resulting 4,4-dimethoxytrityl-hexaethylene glycol compound (5.23 grams, 89% yield) migrated with Rf=0.29.

المصدر