N-bromobutanimide → HCID 58691834, compound

Temperature

0 °C

To a solution of 2,4-dibromo-3-methylthiophene (0.92 g, 3.6 mmol) in carbon tetrachloride was added N-bromosuccinimide (0.64 g, 3.6 mmol) and AlBN (5 mg). The mixture was heated under reflux for 1 h and then for another 4 h in the presence of light. The solution was then cooled to 0° C. and the succinimide was filtered. The residue was washed with carbon tetrachloride. The solvent was removed and the product recrystalized from EtOH to yield 2,4-dibromo-3-(bromomethyl)thiophene (1.08 g, 91%). mp 89-90° C.; 1H NMR (500 MHz, DMSO-d6) δ: 4.53 (s, 2H), 7.89 (s, 1H). MS (EI) m/z 332/334/336 (M+.). Anal. Calcd for C5H3Br3S: C, 17.93; H, 0.90; N, 0.00. Found: C, 18.02; H, 0.86; N, 0.00.

1. temperatureThe mixture was heated
2. temperatureunder reflux for 1 h
3. filtrationthe succinimide was filtered
4. washThe residue was washed with carbon tetrachloride
5. customThe solvent was removed
6. customthe product recrystalized from EtOH

ORD record

ord-3c93a81337f84406a2347768d7e71493

Source dataset

uspto-grants-2008_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07459567B2