반응 #2069092

반응 방정식

chloride

methoxyallene

I2

3-bromobenzaldehyde ethylene acetal

→

3(2-propynyl)benzaldehyde ethylene acetal

용매

THF

THF

THF

반응 조건

후처리

1. 1
   온도becomes warm
2. 2
   온도when it is cooled to 15°
3. 3
   온도is cooled to -20°
4. 4
   workup.ADDITIONThe above Grignard solution (under moisture excluding conditions) is then added to this solution during 5 minutes
5. 5
   workup.STIRRINGwith stirring over 30 minutes
6. 6
   추출the product is extracted with ether
7. 7
   세척The ether layer is washed with water
8. 8
   건조dried (MgSO4)
9. 9
   workup.DISTILLATIONthe residue distilled in vacuo
10. 10
    기타Yield 4.3 g (75%) 89°-96° (0.03 m Hg)

실험 절차

Dry Mg (0.74 g) under dry N2 in a flask is covered with THF (10 ml) and a crystal of I2 added. 5 ml of a solution of 3-bromobenzaldehyde ethylene acetal (7.0 g) in THF (30 ml) is added and kept until it becomes warm, when it is cooled to 15°, and the remainder of the acetal solution added over 15 minutes, then stirred for an additional 1 hour. A mixture of methoxyallene (2.45 g), copper (1)chloride (0.30 g) and THF (30 ml) is cooled to -20°. The above Grignard solution (under moisture excluding conditions) is then added to this solution during 5 minutes, and allowed to warm to 20° C. with stirring over 30 minutes. Saturated aqueous ammnium chloride is added and the product is extracted with ether. The ether layer is washed with water, dried (MgSO4) and the residue distilled in vacuo. Yield 4.3 g (75%) 89°-96° (0.03 m Hg), nD20 1.5422.

출처