反应详情

30 g (0.14 mol) of 2-methyl-1-nitro-3-propylsulfanylbenzene, 18.9 g (0.18 mol) of n-butyl nitrite were dissolved in 120 ml of dimethylformamide and cooled to (−20)° C. Then a solution of potassium t-butoxide in 120 ml of DMF is added dropwise over the course of 25 min. After the reaction mixture had been stirred at (−25)° C. for one hour, it was stirred into a mixture of ice and 150 ml of concentrated hydrochloric acid. The mixture was warmed to room temperature, and the resulting solid was filtered off with suction and washed several times with water and once with cyclohexane. The solid was purified by stirring with a little amount of methylene chloride. Yield: 12.4 g (46% of theory) of the desired product. 1H NMR (in CDCl3): δ=1.05 ppm (t, 3H, aliph. Me), 1.7 ppm (m, 2H, aliph. CH2), 3.0 ppm (t, 2H, S CH2), 6.8 ppm (d, 1H, arom. H), 6.9 ppm (d, 1H, arom. H), 7.35 ppm (m, 1H, arom. H).

1. temperaturecooled to (−20)° C
2. filtrationthe resulting solid was filtered off with suction
3. washwashed several times with water
4. customThe solid was purified
5. stirringby stirring with a little amount of methylene chloride