反应详情

7.75 g (about 18.6 mmol) of 7-ethoxy-1,2-difluoro-3-[1-(4-propylcyclohexyl)prop-2-ynyloxy]naphthalene are heated at 205° C. for 4.5 h in 80 ml of N,N-diethylaniline. The batch is diluted with MTBE and washed a number of times with hydrochloric acid. The organic phase is dried using sodium sulfate and evaporated to dryness. The residue is purified by column chromatography (SiO2, n-heptane:MTBE=4:1). The further purification is carried out by recrystallisation from n-heptane, giving 8-ethoxy-5,6-difluoro-3-(4-propylcyclohexyl)-3H-benzo[f]chromene as a yellow solid.

1. washwashed a number of times with hydrochloric acid
2. customThe organic phase is dried
3. customevaporated to dryness
4. customThe residue is purified by column chromatography (SiO2, n-heptane:MTBE=4:1)
5. customThe further purification
6. customis carried out by recrystallisation from n-heptane