Abstract Bimolecular reaction rate coefficients of k=(1.4±0.2)× 10− 10 and< 5× 10− 17 cm 3/molecule s have been measured at T= 294 K in a flowtube facility for BF+ O→ BO+ F and BF+ O 2→ products, respectively. These results are discussed in terins of the electronic structure of boron monofluoride.