Carbon tetrabromide → 5-Bromo-2-(bromomethyl)-1,3-difluorobenzene

Reaktionsgleichung

[Br:1][C:2]1[CH:9]=[C:8]([F:10])[C:5]([CH2:6]O)=[C:4]([F:11])[CH:3]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(Br)(Br)(Br)[Br:32]>C1COCC1>[Br:1][C:2]1[CH:9]=[C:8]([F:10])[C:5]([CH2:6][Br:32])=[C:4]([F:11])[CH:3]=1

Komponenten

Versuchsvorschrift

To a cooled (0° C.) solution of 4 g (17.6 mmol) 4-bromo-2,6-difluorobenzyl alcohol in 50 ml THF, 7 g (26.4 mmol) triphenylphosphine and 8.83 g (26.4 mmol) carbon tetrabromide are added with stirring. Stirring is continued for 10 min at 0° C. and for 1 h at room temperature. After that the reaction mixture is filtered and the filtrate is concentrated in vacuo. The residue is purified by chromatography (silicagel, hexane) to afford the title compound as yellowish oil.