On the structure of the radical addition product of 2-benzoxypentafluoropropene with 1,4-dioxane

The structure of the addition reaction product of 2-benzoxypentafluoropropene [CF2 = C(CF3)OCOC6H5] with 1,4-dioxane was investigated by the crystallographic analysis of the single crystal to conclude that the 2,6-disubstitution of 1,4-dioxane took place, on the contrary to the assumption that the reaction would take place at the 2- and 5-positions based on the product structure of 2-benzoxypentafluoropropene with tetrahydrofuran. Modified polyaddition reaction mechanism of bis(α–trifluoromethyl–β,β–difluorovinyl) terephthalate [CF2 = C(CF3)OCO–C6H4–COOC(CF3) = CF2] with 1,4-dioxane including 1,5-radical shift mechanism is proposed.