Preparation of one intermediate for pyrethroids

Details Preparation of one intermediate for pyrethroids Preparation of one intermediate for pyrethroids

2007-12-25

2007-12-25

Witherspoon, Sikarl A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C560S065000

Reexamination Certificate

active

10575420

ABSTRACT:
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.

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International Search Report for PCT/CN2004/000040 dated Aug. 26, 2004 (2 pages).

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