Abstract: Process for preparing complex pesticidal 1-(haloaryl)heterocyclic compounds by reacting 1-(nitroaryl)heterocycles with metallic halide salts.

Abstract: The invention relates to isoxazole derivatives of formula (I): ##STR1## wherein: Ar represents phenyl optionally substituted by from one to three groups and wherein two substituents on adjacent positions of the phenyl ring, together with the two atoms to which they are attached, form a 5- to 7-membered ring which is optionally substituted;R represents the hydrogen atom or a group --CO.sub.2 R.sup.3 ;R.sup.1 represents alkyl, haloalkyl or optionally substituted cycloalkyl;R.sup.3 represents alkyl, alkenyl or alkynyl containing up to six carbon atoms which is optionally substituted by one or more halogen atoms;and their use as herbicides.

Abstract: 4-heteroaroylisoxazole derivatives of formula I: ##STR1## wherein: Ar represents an optionally substituted group Het, wherein Het represents a first heterocyclic ring containing from one to four heteroatoms in the ring selected from oxygen, nitrogen and sulphur, which is optionally fused with a benzene, or carbocyclic or second heterocyclic ring (which is optionally saturated or partially saturated) to form a bicyclic system, wherein the first heterocyclic ring of the group Het is attached to the carbonyl group in the 4-position of the isoxazole ring;R represents hydrogen or --CO.sub.2 R.sup.3 ;R.sup.1 represents alkyl or haloalkyl or a cycloalkyl group optionally substituted by one or more groups R.sup.4 ;R.sup.3 and R.sup.4 independently represent alkyl or haloalkyl;agriculturally acceptable salts thereof and their use in weed control is described.

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.

Abstract: The invention relates to nicotinic acid hydrazone derivatives of formula I: ##STR1## in which the various symbols are as defined in the description, and their use as herbicides or as intermediates in the synthesis of herbicides.

Abstract: The invention relates to 4-benzoylisoxazole derivatives of formula (I): ##STR1## wherein R represents hydrogen or --CO.sub.2 R.sup.4 ; R.sup.1 represents alkyl, haloalkyl or optionally substituted cycloalkyl;R.sup.2 represents halogen, alkyl, haloalkyl, alkyl substituted by one or more groups --OR.sup.5 ; ora group selected from nitro, cyano, --CO.sub.2 R.sup.5, --S(O).sub.p R.sup.6, --O(CH.sub.2).sub.m OR.sup.5, --COR.sup.5, --OR.sup.5 and --N(R.sup.8)SO.sub.2 R.sup.7 ;R.sup.3 represents --SO.sub.2 R.sup.7 ;X represents the oxygen atom;n represents zero or an integer from one to four;R.sup.4 represents alkyl or haloalkyl;R.sup.5 and R.sup.6, independently represent alkyl, haloalkyl or optionally substituted phenyl;R.sup.7 represents alkyl, haloalkyl, optionally substituted phenyl or --NR.sup.5 R.sup.6 ;R.sup.8 represents hydrogen, optionally halogenated alkyl, alkenyl or alkynyl; cycloalkyl, optionally substituted phenyl, --SO.sub.2 R.sup.6 or --OR.sup.

Abstract: A 2-benzoylcyclic-1,3-dione derivative of the formula: ##STR1## wherein X represents methylene, oxygen, sulphur or --NR.sup.4 --, Y represents --C(R.sup.5) (R.sup.6)-- or oxygen, R.sup.1 represents hydrogen or alkyl optionally substituted by halogen or represents cycloalkyl, R.sup.2 represents hydrogen or R.sup.7 or R.sup.1 and R.sup.2 together represent alkylene, R.sup.3 represents halogen, hydroxy, carboxy, nitro, cyano or amino or carbamoyl (which may be substituted by one or two alkyl groups), alkoxycarbonyl, alkanoyl, or alkanoylamino, R, RO, RS, RSO or RSO.sub.2 in which R represents alkyl optionally substituted by halogen, R.sup.4 represents hydrogen or alkyl or alkoxycarbonyl, R.sup.5 represents hydrogen or alkyl or alkoxycarbonyl, R.sup.6 represents hydrogen or alkyl, R.sup.7 represents alkyl which may be substituted by halogen or alkylthio or by a group (R.sup.8).sub.n -phenyl-S-, or represents cycloalkyl or tetrahydrothiapyran-3-yl or represents a group (R.sup.8).sub.n -phenyl- in which R.sup.