Abstract: Disclosed are a pyrethroid compound, a preparation process and the use thereof, wherein the compound is a stereoisomer of 2,3,5,6-tetrafluoro-4-methoxymethylbenzyl-3-(3,3,3-trifluoro-1-propenyl)-2,2-dimethylcyclopropanecarboxylate. The structure of the compound is represented by formula (A), in which the carbon-carbon double bond in carboxylic acid section is Z configuration, and the absolute stereo configuration at the 1-position of cyclopropane is R, namely, the said compound is 2,3,5,6-tetrafluoro-4-methoxymethylbenzyl-1R-(Z)-3-(3,3,3-trifluoro-1-propenyl)-2,2-dimethylcyclopropanecarboxylate. The said pyrethroid compound has a high activity, and has a significant effect on preventing and curing sanitary pests.

Abstract: Disclosed are a pyrethroid compound, a preparation process and the use thereof, wherein the compound is a stereoisomer of 2,3,5,6-tetrafluoro-4-methoxymethylbenzyl-3-(3,3,3-trifluoro-1-propenyl)-2,2-dimeth ylcyclopropanecarboxylate. The structure of the compound is represented by formula (A), in which the carbon-carbon double bond in carboxylic acid section is Z configuration, and the absolute stereo configuration at the 1-position of cyclopropane is R, namely, the said compound is 2,3,5,6-tetrafluoro-4-methoxymethylbenzyl-1R-(Z)-3-(3,3,3-trifluoro-1-propenyl)-2,2-dimethylcyclopropanecarboxylate. The said pyrethroid compound has a high activity, and has a significant effect on preventing and curing sanitary pests.

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.

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.