Water → 2-(3-bromopropyl)-1,3-dioxolane

Temperature

-70 °C

At -70° C., 50 ml of a 1.2-molar solution of diisobutyl aluminum hydride in toluene is added dropwise gradually to a solution of 9.6 g of the ethyl ester of bromobutyric acid in 595 ml of toluene; the mixture is stirred for 15 minutes at -70° C. and then combined dropwise with 10 ml of isopropyl alcohol and 25 ml of water. The mixture is agitated for 2 hours at room temperature, filtered, the filtrate dried with magnesium sulfate and evaporated under vacuum at 25° C. The residue is dissolved in 500 ml of toluene, 10 ml of ethylene glycol and 100 mg of p-toluenesulfonic acid are added, and the mixture is refluxed for 6 hours with the use of a water trap. Subsequently the mixture is diluted with 500 ml of ether, shaken once with a 5% sodium bicarbonate solution and three times with water, the organic extract is dried with magnesium sulfate and concentrated under vacuum at 30° C. Distillation of the residue at 0.6 torr and 43°-45° C. yields 6.8 g of 2-(3-bromopropyl)-1,3-dioxolane as a colorless liquid.

1. stirringThe mixture is agitated for 2 hours at room temperature
2. filtrationfiltered
3. dry with materialthe filtrate dried with magnesium sulfate
4. customevaporated under vacuum at 25° C
5. dissolutionThe residue is dissolved in 500 ml of toluene
6. addition10 ml of ethylene glycol and 100 mg of p-toluenesulfonic acid are added
7. temperaturethe mixture is refluxed for 6 hours with the use of a water trap
8. additionSubsequently the mixture is diluted with 500 ml of ether
9. stirringshaken once with a 5% sodium bicarbonate solution and three times with water
10. extractionthe organic extract
11. dry with materialis dried with magnesium sulfate
12. concentrationconcentrated under vacuum at 30° C
13. distillationDistillation of the residue at 0.6 torr and 43°-45° C.

ORD record

ord-1e70f09704d546c8a4052cae84ebb6f4

Source dataset

uspto-grants-1990_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04954524