| abstract |
Insecticidal compounds of formula In where R 1 is hydrogen, alkyl or alkenyl;n X is oxygen or sulphur; each R 2 , which may be the same of different, is halogen, alkyl, haloalkyl, cyano, nitro, alkoxy, haloalkoxy, alkylthio, haloalkylthio, alkylsulphonyloxy, alkylsulphonyl, alkoxycarbonyl or acyl or two adjacent R 2 groups together with the carbons to which they are attached form a 5 to 7 membered ring which may comprise one or more oxygen atoms and may be substituted; m is 0 to 4; eithern a) R a is hydrogen and one of R b and R c is phenyl, para substituted by the group R 4 , and the other is hydrogen; or b) R a and R b are both alkyl and R c is phenyl para substituted by the group R 4 ; R 4 and R 5 which may be the same or different, are R 8 SO 2 O, hydrogen, halogen, alkyl, haloalkoxy, alkylthio or alkylsulphonyl, wherein R 8 is alkyl or haloalkyl; with the proviso that at least one of R 4 and R 5 is R 8 SO 2 O or at least R 4 is haloalkoxy. |