A synthetic method for 1-bromo-3-buten-2-one is given. The compound is prep
ared through the following sequence: 2-butanone to 2-methyl-2-ethyl-1,3-dio
xolane to 2-(1-bromoethyl)-2-bromomethyl-1,3-dioxolane to 2-bromomethyl-2-v
inyl-1,3-dioxolane to the final product. Full experimental details includin
g spectral data are given.