“…Multifunctional allylic bromides such as the title compound, (I), are versatile building blocks for the stereoselective construction of natural products and heterocycles of biological relevance (Drewes & Emslie, 1982;Hoffmann & Rabe, 1985;Cheskis et al, 1990;Roush & Brown, 1993;Basavaiah & Hyma, 1996;Grassi et al, 1997;Mateus et al, 2001;Fernandes et al, 2004). Preparation of allylic bromide (I) can be achieved in good yield and excellent stereoselectivity by treating the corresponding -methylene--hydroxy ester (II) (a Baylis-Hillman adduct) (Basavaiah et al, 2003;Ciganek, 1997;Sá , 2003;Hoffmann & Buchholz, 1991) with a combination of HBr and H 2 SO 4 , as previously reported (Fernandes et al, 2004). Careful crystallization from hexane-ethyl acetate (9:1) furnished colourless crystals (m.p.…”