To obtain the subject compound having effect of controlling noxious organisms such as insects and acarids, capable of protecting plants from damages caused by attach and invasion of these noxious organisms and useful as an insecticide and an acaricide.

This compound is represented by formula I (Ar is a halogen, a 1-4C alkyl, a 1-4C haloalkyl, etc.; Ar1 is a halogen, a 1-4C alkyl, a 1-4C haloalkyl, etc.; R and R1 are each independently H, a 1-4C alkyl, a 3-6C cycloalkyl, etc.; R2 is H, Cl, Br, cyano, etc.) and its optical isomer and its cis and trans isomer. The compound of formula I is obtained by reacting 4-aryl-3- fluoro-2-butene-1-ol of formula II with a brominating agent to form 4-aryl-1- bromo-3-fluoro-2-butene of formula III and treating the compound of formula III with about 0.0025-0.1mol equivalent palladium catalyst, at least about 2 mol equivalent base and a boric acid of the formula (HO)2Bar1.