Insecticidal substituted acetate compounds

A substituted acetate compound of the formula ##STR769## wherein Y is selected from the group consisting of the formulae:

• ##STR770## in which R.sub.1 and R.sub.2 are individually hydrogen, halogen, cyano, nitro, lower alkyl, lower alkenyl, lower alkynyl, lower alkoxy, lower alkoxyalkyl, halogen-substituted lower alkyl, halogen-substituted lower alkenyl, halogen-substituted lower alkynyl, lower alkylthio, lower alkylsulfoxyl, C.sub.2 -C.sub.4 alkanoyl, C.sub.2 alkanoyloxy, lower alkoxycarbonyl, lower alkenyloxycarbonyl, lower alkynyloxycarbonyl, methylenedioxy, tetramethylene or trimethylene group R.sub.3 and R.sub.4 are individually hydrogen, halogen, cyano, nitro, lower alkyl, lower alkenyl, lower alkynyl, lower alkoxy, lower alkoxyalkyl, halogen-substituted lower alkyl, halogen-substituted lower alkenyl, halogen-substituted lower alkynyl, lower alkylthio, lower alkylsulfoxyl, C.sub.2 -C.sub.4 alkanoyl, lower alkoxycarbonyl, lower alkenyloxycarbonyl or lower alkynyloxycarbonyl group;
• A represents an oxygen atom or a sulfur atom;
• R.sub.5 represents hydrogen, halogen, cyano, nitro or lower alkyl group;
• m is an integer of from 1 to 3;
• R.sub.6 represents hydrogen, halogen, cyano, nitro or lower alkyl group;
• n is an integer of from 1 to 3;
• and the dotted line in the formula (V) represents a double bond present at a position conjugated or non-conjugated with the ketone (C=O), or Y represents a substituted ethylene group of the formula (VI) ##STR771## in which R.sub.7, R.sub.8 and R.sub.9 constitutes a plane together with the double bond at .beta.-.gamma. position of the ester group, and are individually hydrogen, lower alkyl, lower alkenyl, lower alkynyl, halogen, Z represents a straight or branched lower alkyl, lower alkenyl, lower alkynyl, lower alkoxy, cyano, halogen-substituted lower alkyl, halogen-substituted lower alkenyl group or an alicyclic group having 3 to 7 carbon atoms;
• in which R.sub.10 represents an allyl, propargyl, benzyl, thenyl, furylmethyl, phenoxy or phenylthio group;
• R.sub.11 represents hydrogen, methyl, trifluoromethyl or halogen R.sub.10 and R.sub.11 may, when they are bonded to each other at terminals, form a trimethylene or tetramethylene group;
• R.sub.12 represents hydrogen, ethynyl or cyano;
• t is an integer of from 1 to 2.