NEW MATERIAL:An alkoxyamine derivative expressed by formula I (R1 is 3-5C alkyl; R2 is lower alkyl; n is 2, 3 or 4; either one of A and B is O and the other is -NH-).

EXAMPLE: N-[4-(2-Ethylbutyl)phenoxy]propyl-O-ethylhydroxyamine.

USE: Useful as an active ingredient of insecticide, having excellent gibbenylhormone activity and capable of exhibiting extremely high control force against insect of Diptera, Lepidoptera, Coleoptera, etc.

PREPARATION: For example, a compound expressed by formula II is reduced to provide the compound expressed by formula I. The above-mentioned reduction is carried out using a reducing agent, preferably of sodium borohydride, etc., in a solvent such as methanol from 0°C to a boiling point of solvent used, especially at nearly ambient temperature while controlling pH. As other method, a compound expressed by formula III (r1 and r2 are H or lower alkyl) is reduced to provide the compound expressed by formula I.