Ethanol → 4-Bromo-pent-4-enoic acid ethyl ester

Temperature

60 °C

To a solution of 3.73 g (0.0208 mol) of unpurified 4-bromo-pent-4-enoic acid in 3 ml chloroform with 1 drop of N,N-dimethylformamide was added 1.18 ml (0.0162 mol) of thionyl chloride. After this mixture had been heated to 60° C. for 30 minutes, it was added to a solution of 2.46 ml (0.0436 mol) ethanol and 1.97 ml (0.024 mol) pyridine and 13 ml methylene chloride. After stirring for 30 minutes, the reaction mixture was concentrated in vacuo. To the residue was added diethyl ether and water. The resulting mixture was transferred to a separatory funnel where the phases were separated. The isolated organic layer was dried over magnesium sulfate and filtered. The solvent was removed from the filtrate in vacuo to yield 3.5 g of 4-bromo-pent-4-enoic acid ethyl ester as an oil which was purified via vacuum distillation.

1. concentrationthe reaction mixture was concentrated in vacuo
2. additionTo the residue was added diethyl ether and water
3. customThe resulting mixture was transferred to a separatory funnel
4. customwhere the phases were separated
5. dry with materialThe isolated organic layer was dried over magnesium sulfate
6. filtrationfiltered
7. customThe solvent was removed from the filtrate in vacuo

ORD record

ord-dd25a13c3023483ba5359ab40a01edad

Source dataset

uspto-grants-2003_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06548448B2