反应详情

温度

50 °C

20 g (0.82 mol) of magnesium activated with 0.1 ml of dibromoethane are introduced into a four litre reactor under a stream of nitrogen. A solution of 200 g (0.75 mol) of 2-bromo-5,6,7,8-tetrahydro-5,5,8,8-tetramethylnaphthalene is added dropwise so as to maintain the reflux of the THF and the mixture is stirred at 50° C. for two hours. The reaction medium is then cooled to −5° C. and 1.2 g (8.2 mmol) of CuBr are added and a solution of 58 g (0.82 mol) of methoxyallene in 100 ml of THF is introduced dropwise. The mixture is stirred for one hour at −5° C. and is then allowed to return to room temperature and is stirred for two hours. The reaction medium is poured into saturated ammonium chloride solution and extracted with ethyl acetate, and the organic phase is separated out after settling has taken place, dried over magnesium sulphate and evaporated. The oil obtained is distilled at 0.02 mm Hg and the fraction passing at 95-100° C. is collected. 79 g (47%) of the expected product are obtained in the form of a colourless oil.

1. additionare introduced into a four litre reactor under a stream of nitrogen
2. temperatureto maintain the
3. temperatureThe reaction medium is then cooled to −5° C.
4. stirringThe mixture is stirred for one hour at −5° C.
5. customto return to room temperature
6. stirringis stirred for two hours
7. extractionextracted with ethyl acetate
8. customthe organic phase is separated out after settling
9. dry with materialdried over magnesium sulphate
10. customevaporated
11. customThe oil obtained
12. distillationis distilled at 0.02 mm Hg
13. custompassing at 95-100° C.
14. customis collected