Importance

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Abstract

Herbicidal compounds of formula (I) and salts thereof, where A is --N.dbd. or --CH.dbd.; X is --OH, --OR.sup.10, --SH, --SR.sup.10, --SCN, NH.sub.2, --NHacyl, --CH.sub.2 OH, --CH.sub.2 OR.sup.9 or --CN; R.sup.1 and R.sup.2, which may be the same or different, each represent alkyl, alkoxy, haloalkyl, haloalkoxy, halo, alkylamino or dialkylamino; R.sup.3 is --CN, --COOR.sup.5, --CONR.sup.6 R.sup.7, --CSNH.sub.2, --CHO, --CH.dbd.Z, --CH(Oalkyl).sub.2, --CH.sub.2 OH, --CH.sub.2 OR.sup.9, --COSR.sup.4a, --CS.sub.2 R.sup.4a, or a substituted or unsubstituted 5- or 6-membered heterocyclic group linked via a ring carbon atom which is between two ring heteroatoms; R.sup.4 and R.sup.4a, which may be the same or different, are each H, or a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, aryl, aralkyl or heteroaryl group; R.sup.5 is H, or a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycoalkyl, aryl, aralkyl or heteroaryl group, or a group of formula (II) where B and D are each alkyl, or together with the carbon atom to which they are attached form a 5-, 6- or 7-membered carbocyclic or heterocyclic ring; R.sup.6 is a group as defined for R.sup.4a, and R.sup.7 is a group as defined for R.sup.4a or is --SO.sub.2 R.sup.8, --OH, --CN, --OR.sup.10, --NH.sub.2 or --NHR.sup.10 ; or R.sup.6 and R.sup.7 together form a ring; R.sup.8 is a substituted or unsubstituted alkyl alkenyl, alkynyl, cycloalkyl, aralkyl, aryl or heteroaryl group, or a group --NR.sup.4b R.sup.4c where R.sup.4b and R.sup.4c, which may be the same or different, are each a group as defined for R.sup.4a, or together form a ring; R.sup.9 is a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, aralkyl or acyl group; R.sup.10 is a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, aryl, aralkyl, heteroaryl or acyl group; Z is .dbd.NOR.sup.4a or .dbd.N--NR.sup.4d R.sup.12, where R.sup.4d is a group as defined for R.sup.4a, and R.sup.1 is a group as defined for R.sup.4a or is a substituted or unsubstituted acyl group, or R.sup.4d and R.sup.12 together form a ring; with the proviso that, when R.sup.4 is ortho-substituted phenyl or naphthyl, any ortho-substituent thereon is halogen, --NO.sub.2, --OH, --OR.sup.10, --SH, --SR.sup.8, --SOR.sup.8, --SO.sub.2 R.sup.8, --NH.sub.2, --NR.sup.6 R.sup.10, aryl or heteroaryl.

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First Claim