Pyridine compounds which are useful as pesticides

Abstract

Compounds of formula ##STR1## wherein R.sub.1 is hydrogen, C.sub.1 -C.sub.4 alkyl or C.sub.3 -C.sub.6 cycloalkyl, R.sub.2 is hydrogen or C.sub.1 -C.sub.4 alkyl, R.sub.3 is hydrogen, C.sub.1 -C.sub.4 alkyl or C.sub.3 -C.sub.6 cycloalkyl and R.sub.4 is C.sub.1 -C.sub.4 alkyl, C.sub.3 -C.sub.6 cycloalkyl or --CH.sub.2 CH.sub.2 COOR.sub.7, or R.sub.3 and R.sub.4 together are --(CH.sub.2).sub.4 -- or --(CH.sub.2).sub.5 --, R.sub.5 is hydrogen, C.sub.1 -C.sub.4 alkyl, ##STR2## --CH.sub.2 OCH.sub.3, --CN, --COOR.sub.7 or ##STR3## R.sub.6 is hydrogen, chlorine, methyl or nitro, R.sub.7 and R.sub.8 are each methyl or ethyl, A is an unsubstituted or mono- to tetra-substituted, aromatic or non-aromatic, monocyclic or bicyclic, heterocyclic radical, one or two substituents being selected from the group consisting of C.sub.1 -C.sub.3 haloalkyl, cyclopropyl, halocyclopropy, C.sub.2 -C.sub.3 alkenyl, C.sub.2 -C.sub.3 alkynyl, C.sub.2 -C.sub.3 haloalkenyl, C.sub.2 -C.sub.3 haloalkynyl, C.sub.1 -C.sub.3 haloalkoxy, C.sub.1 -C.sub.3 alkylthio, C.sub.1 -C.sub.3 haloalkylthio, allyloxy, propargyloxy, allylthio, propargylthio, haloallyloxy, haloallylthio, cyano and nitro, and from one to four substituents being selected from the group consisting of C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy and halogen, and .dbd.X is .dbd.N--NO.sub.2, .dbd.CH--NO.sub.2, .dbd.N--CN or .dbd.CH--CO--CF.sub.3, in free form or in the form of acid addition salts, can be used as agrochemical active ingredients and can be prepared in a manner known per se.