反应 #1960491

反应方程式

1-(1-ethynylhexyloxy)-2,3-difluorobenzene

→

7,8-difluoro-2-pentyl-2H-chromene

溶剂

N,N-diethylaniline

MTBE

反应条件

后处理

1. 1
   洗涤washed a number of times with 1 N HCl
2. 2
   其他The organic phase is dried
3. 3
   其他evaporated to dryness
4. 4
   其他The residue is purified by column chromatography (SiO2, n-pentane:1-chlorobutane=5:1)

实验过程

62.0 g (0.26 mol) of 1-(1-ethynylhexyloxy)-2,3-difluorobenzene are heated at 195° C. for 2 h in 390 ml of N,N-diethylaniline. The batch is diluted with MTBE and washed a number of times with 1 N HCl. The organic phase is dried using sodium sulfate and evaporated to dryness. The residue is purified by column chromatography (SiO2, n-pentane:1-chlorobutane=5:1), giving 7,8-difluoro-2-pentyl-2H-chromene as a brown oil.

来源