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Abstract

Pyrido[2,3-d]pyridazin-5-one and pyrido[2,3-d]pyridazin-5-thione derivatives of general formula (I): ##STR1## wherein R and R.sup.1 independently represent hydrogen, optionally halogenated alkyl, alkenyl or alkynyl, optionally substituted heterocycle or a group --[CR.sup.41 R.sup.42 ].sub.n -(phenyl)-(R.sup.3).sub.q ; R.sup.2 represents halogen, optionally halogenated alkyl, alkenyl or alkynyl, CN; --CO.sub.2 R.sup.4 ; --S(O).sub.r R.sup.4 ; --NO.sub.2 ; --NR.sup.41 R.sup.42 ; --OH; --COR.sup.4, --S(O).sub.r R.sup.5, --CO.sub.2 R.sup.5, --OR.sup.5 ; --CONR.sup.41 R.sup.42, --OSO.sub.2 R.sup.5, --OSO.sub.2 R.sup.6, --OCH.sub.2 R.sup.5, --N(R.sup.41)COR.sup.6, --N(R.sup.41)SO.sub.2 R.sup.5, --N(R.sup.41)SO.sub.2 R.sup.6, --SO.sub.2 NR.sup.41 R.sup.42, optionally substituted phenyl, alkoxy or haloalkoxy; X represents oxygen or sulphur; R.sup.3 represents halogen, optionally halogenated alkyl, alkenyl, alkoxy, alkynyl, --OH, --S(O).sub.r R.sup.4, --CO.sub.2 R.sup.4, COR.sup.4, --CN, --NO.sub.2, --NR.sup.41 R.sup.42, --OR.sup.5 ; --CONR.sup.41 R.sup.42, --OSO.sub.2 R.sup.5, --OSO.sub.2 R.sup.6, --OCH.sub.2 R.sup.5, --N(R.sup.41)COR.sup.6, --N(R.sup.41)SO.sub.2 R.sup.5, --N(R.sup.41)SO.sub.2 R.sup.6 or --SO.sub.2 NR.sup.41 R.sup.42 ; R.sup.4 represents a hydrogen atom or optionally halogenated C.sub.1-6 alkyl; R.sup.41 and R.sup.42, which may be the same or different, each represents a hydrogen atom or optionally halogenated C.sub.1-4 alkyl; R.sup.5 represents a phenyl group optionally substituted by from one to five groups selected from halogen, nitro, cyano, R.sup.4 and --OR.sup.4 ; m represents zero or an integer from one to three; n represents zero, one or two; where n is two, the groups --(CR.sup.41 R.sup.42)-- may be the same or different; q represents zero or an integer from one to five; r represents zero, one or two; with the proviso that when m represents zero R and R.sup.1 do not simultaneously represent hydrogen; and agriculturally acceptable salts thereof are useful as herbicides.

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First Claim