تفاعل #82996

معادلة التفاعل

octyl bromide

3,6-Dihydroxy xanthone

water

→

3-Octoxy-6-hydroxy xanthone

المردود 30.0%

المذيبات

methanol

methanol

ظروف التفاعل

المعالجة

1. 1
   workup.DISSOLUTIONAfter the compound was completely dissolved
2. 2
   درجة الحرارةat refluxing temperature
3. 3
   أخرىgiving a precipitate
4. 4
   ترشيحThis white precipitate was then filtered
5. 5
   غسيلwashed with water
6. 6
   غسيلwashed with hot hexane
7. 7
   أخرىto remove the disubstituted side product

الإجراء التجريبي

3,6-Dihydroxy xanthone (1,20 mmol) was dissolved in hot mixture of basic water (80 mmol of Na2CO3 in 100 ml of water) and 50 ml of methanol. After the compound was completely dissolved, a methanol solution of octyl bromide (40 mmol in 50 ml of methanol) was added dropwise and the reaction mixture was stirred rigorously for 120 hours at refluxing temperature. The reaction mixture was cooled to room temperature giving a precipitate. This white precipitate was then filtered, washed with water, and washed with hot hexane to remove the disubstituted side product. 3-Octoxy-6-hydroxy xanthone was obtained in 30% yield. 1HNMR (DMSO): d11.0(1H,s), 8.05 (1H,d,J=6.0 Hz), 8.02 (1H,d,J=5.8 Hz), 7.08 (1H,s), 7.00 (1H,d,J=8.8 Hz), 6.89 (1H,d,J=8.8 Hz), 6.85 (1H,s), 4.43 (2H,t,J=6.2 Hz), 1.8(2H,M), 1.3 (10H,m), 0.9 (3H,t).

المصدر