Methods for preparing 2,3,5,6-tetrafluorodimethylolbenzene, an
intermediate for the preparation of pyrethroids, are disclosed. A method
for preparing 2,3,5,6-tetrafluorodimethylolbenzene includes the reduction
of tetrafluoroterephthalate. Various reduction processes are disclosed,
which are simple and safe and can afford the product in high yield and
purity. Processes for preparing tefluthrin from
2,3,5,6-tetrafluorodimethylolbenzene, by halogenation, hydrogenation, and
esterification, are also disclosed.