Potassium Carbonate → Benzene, 4-(2-(2-butoxyethoxy)ethoxy)-1,2-(methylenedioxy)-

34.04 g (0.105 moles) of 2-(2-butoxyethoxy)-ethyl tosylate (95%) were reacted with 14.5 g (0.105 moles) of 5-hydroxy-benzo[1.3]dioxole and 14.5 g (0.105 moles) of anhydrous potassium carbonate in 125 ml of acetone. The mixture was heated to reflux for 2 hrs, cooled to room temperature and kept, under stirring, at that temperature for 6 hrs. The mixture was then filtered and the organic solution was evaporated u.v. (20° C./21 mbar) . The residue was diluted with 100 ml of dichloromethane and washed with 12 ml of an aqueous solution of sodium hydroxide 1N and water. The organic phase was separated, washed with water and evaporated u.v (20° C./21 mbar). An oil residue was obtained that was purified on silica gel column (eluant n-hexane:ethyl acetate 4:1 v/v). After evaporation 14.84 g (97.43%) of 5-[2-(2-Butoxy-ethoxy)-ethoxy]-benzo[1,3]dioxole were obtained whose NMR and MS analyses corresponded to those of the aforementioned compound.

1. temperatureThe mixture was heated
2. temperatureto reflux for 2 hrs
3. filtrationThe mixture was then filtered
4. customthe organic solution was evaporated u.v
5. custom(20° C./21 mbar)
6. additionThe residue was diluted with 100 ml of dichloromethane
7. washwashed with 12 ml of an aqueous solution of sodium hydroxide 1N and water
8. customThe organic phase was separated
9. washwashed with water
10. customevaporated u.v (20° C./21 mbar)
11. customAn oil residue was obtained
12. customthat was purified on silica gel column (eluant n-hexane:ethyl acetate 4:1 v/v)
13. customAfter evaporation 14.84 g (97.43%) of 5-[2-(2-Butoxy-ethoxy)-ethoxy]-benzo[1,3]dioxole
14. customwere obtained whose NMR and MS analyses

ORD record

ord-bc3d2e2b14be44928ade7726d0eff95f

Source dataset

uspto-grants-2014_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08809389B2