New hydrazine derivative and pesticidal composition comprising said derivative as an effective ingredient

A hydrazine derivative represented by the following formula (I):

• ##STR67## wherein A represents --CH.sub.2 --;
• B represents --O--;
• R.sup.1, R.sup.2, R.sup.3 and R.sup..sup.4 each independently represent a hydrogen atom or a methyl group;
• R.sup.5 represents a (C.sub.1 -C.sub.4) alkyl group, a (C.sub.1 -C.sub.4) haloalkyl group or a halogen atom;
• R.sup.6 represents a hydrogen atom, a (C.sub.1 -C.sub.4) alkyl group or a halogen atom;
• R.sup.7 represents a hydrogen atom or a halogen atom;
• R.sup.8, R.sup.9 and R.sup.10 each independently represents a hydrogen atom, a (C.sub.1 -C.sub.4)alkyl group, a (C.sub.1 C.sub.4)haloalkyl group, a halogen atom, a nitro group, a (C.sub.1 -C.sub.4)alkoxy group, a (C.sub.2 -C.sub.4)alkenyloxy group, a (C.sub.2 -C.sub.4)alkynyloxy group, a (C.sub.2 C.sub.4)alkenyl group, a (C.sub.1 -C.sub.4)haloalkoxy group, a phenyl(C.sub.1 -C.sub.4)alkoxy group whose phenyl moiety is optionally substituted with a halogen atom, or a phenoxy(C.sub.1 -C.sub.4)alkoxy group whose phenyl moiety is optionally substituted with a (C.sub.1 -C.sub.2) alkyl group, CF.sub.3 or halogen atom;
• R.sup.11 represents a hydrogen atom, a cyano group, a (C.sub.1 -C.sub.4)haloalkylthio group, a (C.sub.1 -C.sub.4)alkoxycarbonylcarbonyl group or a (C.sub.1 14 C.sub.4)alkylcarbonyloxymethyl group;
• R.sup.12 represents a branched (C.sub.4 -C.sub.8)alkyl group;
• and
• n represents 0.