Pesticidal compounds

1. A compound of formula (I) ##STR17## or a salt thereof, in which n represents an integer from 0 to 4;

• m represents an integer 0 or 1;
• each R independently represents a halogen atom or a nitro, cyano, hydroxyl, alkyl, alkenyl, haloalkyl, haloalkenyl, alkoxy, haloalkoxy, haloalkenoxy, amino, alkylamino, dialkylamino, alkoxycarbonyl, carboxyl, alkanoyl, alkylthio, alkylsulphinyl, alkylsulphonyl, carbamoyl, alkylamido, cycloalkyl, aryl or aralkyl group;
• R.sup.1 and R.sup.2 each independently represent an optionally substituted alkoxy group or together represent a group .dbd.O, .dbd.S or .dbd.N--OR.sup.9, where R9 represents a hydrogen atom or an optionally substituted alkyl group;
• R.sup.3 represents a group OR.sup.10 where R.sup.10 represents a hydrogen atom, an optionally substituted aryl or aralkyl group, or a group --CO--R.sup.11, --CO--O--R.sup.11, --SOR.sup.11, --SO.sub.2 --R.sup.11, --P(X)(OR.sup.12)(OR.sup.13), --P(X)(R.sup.12)(OR.sup.13), --P(OR.sup.12)(OR.sup.13) or --P(R.sup.12)(OR.sup.13) where R.sup.11 represents a hydrogen atom, an optionally substituted alkyl, alkenyl, aryl or aralkyl group or a group-NR.sup.12 R.sup.13 ;
• R.sup.12 and R.sup.13 independently representing a hydrogen atom or an optionally substituted alkyl group and X represents an oxygen or sulfur atom;
• R.sup.6 represents an optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl, alkoxy, alkenyloxy, alkynyloxy, cycloalkyloxy, cycloalkenyloxy or aryloxy group;
• R.sup.7 and R.sup.8 independently represent an optionally substituted alkoxy group or together represent a group .dbd.O, .dbd.S or .dbd.N--OR.sup.9, where R.sup.9 is as previously defined;
• R.sub.4 and R.sub.5 each independently represent a halogen atom or an optionally substituted alkyl or alkenyl group, or together with the interjacent carbon atom represent an optionally substituted cycloalkyl or cycloalkenyl ring;
• and
• A represents a straight or branched chain alkyl or alkenyl group, which may be optionally substituted, an acyclic carbon chain of which links the 3 position of the naphthalene ring shown and the moiety --CR.sup.4 R.sup.5 R.sup.6 ;
• with the provisos that when R.sup.1 with R.sup.2, and R.sup.7 with R.sup.8 are groups .dbd.O and n=0, (i) when R.sup.4 and R5 are methyl, m is 0 and R.sup.6 is ethenyl, then R.sup.3 is not hydroxyl or ethanoyloxy, (ii) when R.sup.4 and R.sup.5 are methyl, m is 0 or m is 1 where A is --CH.sub.2 -- or (CH.sub.2).sub.2 -- and R.sup.3 is hydroxyl, then R.sup.6 is not methyl, (iii) when R.sup.4 and R.sup.5 are methyl, m is 1 where A is --(CH.sub.2).sub.2 -- and R.sup.3 is hydroxyl, then R.sup.6 is not chloro, (iv) when R.sup.4 and R.sup.5 together with the interjacent carbon atom form a cyclohexyl ring, m is 1 where A is --CH.sub.2 and R.sup.3 is hydroxyl, then R.sup.6 is not methyl, (v) when R.sup.4 and R.sup.5 are methyl, m is 1 where A is --CH.sub.2 -- and R.sup.3 is hydroxyl, then R.sup.6 is not hydroxymethyl, and (vi) when m is 0, then R.sup.6 represents a group of C.sub.1-6 carbons in length, or the 2,6-dimethyl-2,6-octadienoate ester thereof.