Syntheses of 3-Bromochromones

Chemical Laboratory, Bhagalpur University, Bhagalpur- 312 007 Fifteen 3-bromochromones have been prepared by brominating the corresponding hydroxyaroyl aroyl/heteroyl methanes and cyclization. Direct bromination of chromones to yield 3·bromochromones has been studied by three different reagents, (i) bromine, (ii) N·bromosuccinimide and (iii) cupric bromide. Cupric bromide gives the best result. The chromone structures have been established by analysis, spectral data and their conversion to the corresponding coumaran-3-ones