Photopromoted carbonylation of bromohydrocarbon catalyzed by cobalt complexes can be carried out under ambient conditions in CH3OH/DMF.It is found that DMF can be decomposed into CO under irradiation and thus can be used as a CO source for the photopromoted carbonylationof bromohydrocarbon,which has been proved by isotope experiment of H13CON（CH3）2.In this paper,the effect of different cobalt catalysts on photopromoted carbonylation of bromohydrocarbon is studied and the way which photopromoted carbonylation of bromohydrocarbon proceed through is deduced.
3,4-Hexancdione,An important flavor and synthesis intermediate,was prepared from ethyl propionate by two steps of condensation and oxidation.The conditions were optimized,the yields of two steps reach 75.6% and 69.1% respectively.The products were characterized by IR and 1H NMR.
