99-90-1

white to light yellow crystals or

Intermediates of Liquid Crystals

Possess activity against positive phototaxis of Chlamydomonas cells. A fundamental starting material for organic synthesis.

4'-Bromoacetophenone is synthesized by the reaction of bromobenzene and acetic anhydride in the presence of aluminum trichloride.
Add bromobenzene and dry carbon disulfide into the reactor, put in powdered anhydrous aluminum trichloride, heat until it starts to reflux, stop heating, add acetic anhydride dropwise, and then reflux for 1 hour after adding, steam out carbon disulfide, and put it while it is still hot. The reactant was poured into the hydrochloric acid ice-water mixture, filtered to dryness, and distilled under reduced pressure to obtain p-bromoacetophenone.

The Journal of Organic Chemistry, 51, p. 5400, 1986 DOI: 10.1021/jo00376a064
Tetrahedron Letters, 26, p. 4657, 1985 DOI: 10.1016/S0040-4039(00)98778-1

Crystallise it from EtOH, MeOH or from pet ether (b 80-100o). [Tanner J Org Chem 52 2142 1987, Beilstein 7 IV 647.]