Perfluoropropylene epoxide was partially converted to α-methoxyperflnoropro-pionio aoid in aqueous methanolio potassium hydroxide at -40~-30°,while under the same condition,in the presence of hydrogen peroxide the epoxide was partially decomposed into triflnoroacetio.acid.At -40、-30°,the reaction of perfluoropro-pylene with aqueous methanolio potassium hydroxide yielded almost quantitatively 1,1,2,3,3,3-hexafluoropropyl methyl ether.