PURPOSE: To produce the titled compound useful as an intermediate of insecticide, etc. selectively, in an industrial scale, at a low cost, by reacting a 2-halogeno-alkoxybenzene with methallyl halide in the psesence of an acid catalyst under specific temperature condition.
CONSTITUTION: The objective compound of formula I can be prepared economically in an industrial scale, by reacting the 2-halogeno-alkoxybenzene of formula I (at least one of Y1 and Y2 is Cl or Br; R is lower alkyl) which is available industrially at a low cost with a methallyl halide at -20W+50°C, preferably 0W30°C in the presence of an acid catalyst, preferably trifluoromethanesulfonic acid or concentrated sulfuric acid, wherein the methallyl halide is added preferably together with the catalyst to the system to effect the selective alkylation of the compound of formula I at the p-position of the alkoxy group. The produced compound can be converted to the compound of formula III having high insecticidal and miticidal activity, economically in high yield.
ASANO TAMOTSU
NAGATA TERUYUKI
NUMATA SATOSHI
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