7-Bromo-benzopyrone（ 5） was synthesized by acylation,Frise rearrangement and ring closing reaction using 3-bromophenol as the starting material. 7-Bromochroman-4-one（ 6） was synthesized by hydrogenation addition of 5 catalyzed by Wilkinson＇s catalyst Rhodium（ Ⅰ） tris（ triphenylphosphine） chloride[Rh（ PPh3）3Cl]. The structure was confirmed by1 H NMR and MS. The optimum reaction conditions for synthesizing 6 were as follows： 5 0. 329 mol,ethanol as the solvent,c（ 5） =0. 4 mol·L^-1,4% mol Rh（ PPh3）3Cl as the catalyst,under 0. 3 MPa of hydr...
