The regiospecific ω-bromination of 2-trichloroacetylcycloalkanones

Six novel ω-brominated-2-trichloroacetylcycloalkanones were regiospecifically obtained in reactions from four 2-trichloroacetylcycloalkanones and bromine. 1H and 13C NMR data reveal that ω-brominated β-diketones are predominantly in keto-keto form.