Pesticidal compounds

A compound of the formula:

• ##STR15## wherein R is a phenyl group substituted by fluorine in the meta, para, both meta and para or ortho, meta and para positions;
• R.sup.1 and R.sup.2 may be the same or different, and each is hydrogen, halo, or a C.sub.1-3 aliphatic group optionally substituted by halo, cyano, C.sub.2-5 carbalkoxy, C.sub.1-4 alkoxy, or a group S(O).sub.m R.sup.11 wherein m is 0, 1 or 2 and R.sup.11 is C.sub.1-4 alkyl, cyano, gem dimethyl, or C.sub.2-5 carbalkoxy;
• R.sup.3 contains between 3 and 18 carbon atoms and is a group R.sup.12 wherein R.sup.12 is a C.sub.1-13 non-aromatic hydrocarbyl group, optionally substituted by a C.sub.2-4 carbalkoxy or cyano group and/or by one or two hydroxy groups and/or by one to five halo atoms which are the same or different and/or by one to three groups R.sup.13 which are the same or different and each include alkyloxy, alkenyloxy, alkynyloxy, alkoxyalkoxy, acyloxy, alkynyloximino, trialkylsilyl, haloalkyloxy, haloalkenyloxy, haloalkylnyloxy, alklyoximino, alkoxycarbonyloxy and mono or di-substituted alkylamino groups, or a group --(O).sub.n S(O).sub.r (O).sub.w R.sup.19 wherein R.sup.19 is a C.sub.1-4 aliphatic group optionally substituted by halo, n is 0 or 1, r is 0, 1 or 2 and w is 0 or 1, the sum of n, r and w is between 0 and 3, or .sub.q R.sup.3 is phenyl or phenyl substituted by cyano and/or by one to five halo atoms and/or by one to three C.sub. 1-4 haloalkyl groups and/or by a group --C.tbd.CH, C.tbd.C-halo or --C.tbd.C--R.sup.12 wherein R.sup.12 is as hereinbefore defined or --C.tbd.C--R.sup.14 wherein R.sup.14 is a group S(O).sub.q R.sup.15 wherein R.sup.15 is methyl, ethyl or trifluoromethyl and q is 0, 1 or 2, or R.sup.14 is SiR.sup.16 R.sup.17 R.sup.18 wherein R.sup.16 and R.sup.17 are the same or different and are each C.sub.1-4 aliphatic groups and R.sup.18 is a C.sub.1-4 aliphatic group or phenyl provided that R.sup.16 and R.sup.17 and R.sup.18 do not contain more than 10 carbon atoms in total;
• and Y, Y.sup.1 and Y.sup.2 are oxygen.