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    251.
    发明专利
    未知

    公开(公告)号：DE59507451D1

    公开(公告)日：2000-01-27

    申请号：DE59507451

    申请日：1995-02-16

    Applicant: BASF AG

    Inventor： MUENSTER PETER ,  DITRICH KLAUS ,  HAMPRECHT GERHARD ,  GERBER MATTHIAS ,  WESTPHALEN KARL-OTTO ,  WALTER HELMUT ,  KARL RUDOLF

    IPC: A01N43/80 ,  C07D261/18

    Abstract: 4-Cyano-isoxazole-5-carboxamides of formula (Ia) and 5-cyano-isoxazole -4-carboxamides of formula (Ib) are new: R1 = H; 1-6C alkyl opt. substd. by 1-5 halogen atoms and/or a CN gp. and/or 1-2 of 1-4C alkoxy, 1-4C haloalkoxy, 1-4C alkylthio, 1-4C haloalkylthio, 3-6C cycloalkyl (substd. by 0-3 of halogen or 1-4C alkyl) or phenyl (substd. by 0-3 of CN, halogen, NO2, 1-6C alkyl, 1-6C haloalkyl, 1-6C alkoxy, 1-6C haloalkoxy, 1-6C alkylthio and 1-6C haloalkylthio); 3-8C cycloalkyl substd. by 0-3 of 1-4C alkyl and halogen; or phenyl substd. by 0-3 of CN, NO2, halogen, 1-6C alkyl, 1-6C haloalkyl, 1-6C alkoxy, 1-6C haloalkoxy, 1-6C alkylthio and 1-6C haloalkylthio; R2 = H; 1-6C alkyl substd. by 0-3 of OH, halogen, 1-4C alkoxy and 1-4C alkylthio; or 3-8C cycloalkyl substd. by 0-3 of halogen, 1-4C alkyl and 1-4C haloalkyl; R3 = 1-4C alkoxy; 1-6C alkyl substd. by 0-3 of halogen, CN, 1-4C alkoxy, 1-4C haloalkyl, 1-4C alkylthio, 1-4C haloalkylthio, 3-8C cycloalkyl or phenyl (substd. by 0-3 of halogen, CN, NO2, 1-4C alkyl, 1-4C haloalkyl, 1-4C alkoxy, 1-4C haloalkoxy, 1-4C alkylthio and 1-4C haloalkylthio); 3-6C cycloalkenyl substd. by 0-3 of halogen or 1-4C alkyl; 3-8C cycloalkyl substd. by 0-3 of halogen, NO2, CN, alkyl, 1-6C haloalkyl, 1-4C alkoxy and 1-4C haloalkoxy; 3-6C alkenyl or alkynyl substd. by 0-3 of halogen and phenyl (substd. by 0-3 of 1-4C alkyl, 1-4C haloalkyl, 1-4C alkoxy, 1-4C haloalkoxy, 1-4C alkylthio, 1-4C haloalkylthio,halogen, CN or NO2); or phenyl substd. by 0-3 of CN, NO2, halogen, 1-6C alkyl, 1-6C haloalkyl, 1-6C alkoxy, 1-6C haloalkoxy, 1-6C alkylthio and 1-6C haloalkylthio.

    252.
    发明专利
    未知

    公开(公告)号：DE59507439D1

    公开(公告)日：2000-01-20

    申请号：DE59507439

    申请日：1995-06-07

    Applicant: BASF AG

    Inventor： HEISTRACHER ELISABETH ,  VON DEM BUSSCHE-HUENNEFELD CHR ,  HAMPRECHT GERHARD ,  KLINTZ RALF ,  SCHAEFER PETER ,  WESTPHALEN KARL-OTTO ,  GERBER MATTHIAS ,  WALTER HELMUT

    IPC: A01N43/653 ,  C07D249/12

    Abstract: PCT No. PCT/EP95/02167 Sec. 371 Date Feb. 18, 1997 Sec. 102(e) Date Feb. 18, 1997 PCT Filed Jun. 7, 1995 PCT Pub. No. WO96/05179 PCT Pub. Date Feb. 22, 1996Substituted triazolinones I I where R1 and R2 are each H, C1-C6-alkyl or C1-C6-haloalkyl, R3 is H or halogen, R4 is CN, halogen, C1-C6-alkyl, C1-C6-haloalkyl, C1-C6-alkoxy or C1-C6-haloalkoxy, R5 is NO2, CN or halogen, R6 is -OR7, -SR7, -N(R8)-R9 or -N(R8)-OR10, R7 is H, C1-C6-alkyl, C3-C6-alkenyl, C3-C6-alkynyl, C3-C6-cycloalkyl, C1-C6-haloalkyl, cyano-C1-C6-alkyl, C1-C6-alkoxy-C1-C6-alkyl, C1-C6-alkylthio-C1-C6-alkyl, C1-C6-alkoxycarbonyl-C1-C6-alkyl, C1-C6-alkylaminocarbonyl-C1-C6-alkyl, di-(C1-C6-alkyl)aminocarbonyl-C1-C6-alkyl, C1-C6-alkoximino-C1-C6-alkyl, di-(C1-C6-alkoxy)-C2-C6-alkyl, di-(C1-C6-alkylthio)-C2-C6-alkyl, C3-C6-haloalkenyl or unsubstituted or substituted phenyl or benzyl, R8, R9 and R10 are each C1-C6-alkylcarbonyl or C1-C6-haloalkyl-carbonyl or each have one of the meanings stated for R7, R8 and R9 together form a 4- to 6-membered carbon chain in which one methylene unit may be replaced by oxygen or C1-C4-alkylimino, and the salts of I are used as herbicides or for the desiccation/defoliation of plants.

    253.
    发明专利
    未知

    公开(公告)号：ES2134837T3

    公开(公告)日：1999-10-16

    申请号：ES93903974

    申请日：1993-02-16

    Applicant: BASF AG

    Inventor： MAYER HORST ,  HAMPRECHT GERHARD ,  WESTPHALEN KARL-OTTO ,  GERBER MATTHIAS ,  KARDORFF UWE ,  WALTER HELMUT

    IPC: C07D239/47 ,  A01N47/36 ,  C07D521/00

    Abstract: PCT No. PCT/EP93/00362 Sec. 371 Date Aug. 24, 1994 Sec. 102(e) Date Aug. 24, 1994 PCT Filed Feb. 16, 1993 PCT Pub. No. WO93/16998 PCT Pub. Date Sep. 2, 1993N-[(Pyrimidin-2-yl)aminocarbonyl]benzenesulfonamide of the general formula I I where R1 is methyl or ethyl; R2 is hydrogen or methyl; R3 is unsubstituted or substituted alkyl; a group ER6, in which E is O or S, R6 being unsubstituted or fluorine-substituted alkyl, with the exception of difluoromethoxy, and, if E is O and at the same time R5 is trifluoromethyl, R6 may furthermore be methylsulfonyl, ethylsulfonyl, trifluoromethylsulfonyl, allylsulfonyl or propargylsulfonyl; NO2 or OH; dialkylaminosulfonyl if R5 is fluorine; C1- or C2-alkylsulfonyl which may carry 1 to 3 halogen atoms; R4 is hydrogen, methyl, ethyl, methoxy, ethoxy, fluorine, chlorine, methylthio, ethylthio or C1 or C2-haloalkoxy; and R5 is fluorine or trifluoromethyl, and their environmentally compatible salts, processes for their preparation and their use.

    255.
    发明专利
    未知

    公开(公告)号：DE59309487D1

    公开(公告)日：1999-05-06

    申请号：DE59309487

    申请日：1993-04-16

    Applicant: BASF AG

    Inventor： MAYWALD VOLKER ,  KUEKENHOEHNER THOMAS ,  MUENSTER PETER ,  VON DEYN WOLFGANG ,  WALTER HELMUT ,  GERBER MATTHIAS ,  WESTPHALEN KARL-OTTO ,  KARDORFF UWE

    IPC: A01N43/80 ,  C07D261/18 ,  C07D413/12

    Abstract: PCT No. PCT/EP93/00918 Sec. 371 Date Sep. 29, 1994 Sec. 102(e) Date Sep. 29, 1994 PCT Filed Apr. 16, 1994 PCT Pub. No. WO93/22295 PCT Pub. Date Nov. 11, 1993The invention pertains to isoxazolecarboxamides of the formula I I where R1 is alkyl, cycloalkyl, alkoxyalkyl, alkenyl, alkynyl, phenyl or unsubstituted or substituted benzyl, R2 is hydrogen or alkyl and R3 is alkyl, cycloalkyl, alkenyl, alkynyl, phenyl or unsubstituted or substituted benzyl, and the plant-tolerated salts of those compounds in which R2 is hydrogen, their preparation and their use.

    256.
    发明专利
    未知

    公开(公告)号：DE59309486D1

    公开(公告)日：1999-05-06

    申请号：DE59309486

    申请日：1993-04-20

    Applicant: BASF AG

    Inventor： KLINTZ RALF ,  HEISTRACHER ELISABETH ,  SCHAEFER PETER ,  HAMBRECHT GERHARD ,  PLATH PETER ,  KARDORFF UWE ,  GERBER MATTHIAS ,  WESTPHALEN KARL-OTTO ,  WALTER HELMUT

    IPC: C07D317/30 ,  A01N37/30 ,  A01N37/32 ,  A01N37/34 ,  A01N37/46 ,  A01N43/08 ,  A01N43/12 ,  A01N43/16 ,  A01N43/18 ,  A01N43/28 ,  A01N43/32 ,  A01N43/38 ,  A01N43/40 ,  A01N43/74 ,  A01N43/78 ,  C07C233/57 ,  C07C233/60 ,  C07C233/61 ,  C07C233/62 ,  C07C233/63 ,  C07C237/42 ,  C07C251/48 ,  C07C251/60 ,  C07C255/13 ,  C07C255/24 ,  C07C255/42 ,  C07C255/46 ,  C07C255/58 ,  C07C271/62 ,  C07D209/48 ,  C07D295/185 ,  C07D307/12 ,  C07D307/90 ,  C07D309/06 ,  C07D335/02 ,  C07D339/06 ,  C07D339/08 ,  C07D401/10 ,  C07D413/06 ,  C07D413/10 ,  C07D417/06 ,  C07D417/10

    Abstract: Substd. cyclohexene-1,2-dicarboxylic acid derivs. of formula (I), and their salts are new. Where T = CONR1R2 or CN; R1, R2 = H; R, 3-6C alkenyl, or 3-6C alkynyl, all opt. substd. by 1-3 halo, CN, NH2, SH, OH, OR, RSO, RSO2, RCO, COOH, ROCO, RNH, (R)2N, RNHCO, (R)2NCO, (RO)(HO)PO, (RO)2PO, or Ar); or Ar' when R1 is H or R, R2 may also be OH, RO, 3-6C alkenyloxy, 3-6C alkynyloxy, 3-7C cycloalkoxy 5-7 cycloalkenyloxy, 1-6C haloalkoxy, 3-6C halo alkenyloxy, 3-7C cycloalkyl-1-6C alkoxy, RCOO, 1-6C cyanoalkoxy, etc.; NR1R2 = a 3-8 membered non-aromatic heterocycle contg. 1-3N atoms and/or one O or S atom and opt. 1-2 CO gps., the ring being opt. substd. by 1-3R; Ar = phenyl or a 3-8 membered heterocycle (contg. 1-4 heteroatoms selected from 1-4N, 1O or 1S) both opt. substd. on every substitutable atom by OH, halo, CN, NO2, CF3, R or RO; Ar' as Ar except that the heterocycle contains 1-4 heteroatoms selected from 1-4N, 1-20 and 1-2S, and only C-atoms may be substd. R = 1-6C alkyl; R3 = H or R; R4 = H or halo; R5 = H, halo, NO2, CN or CF3; R6 = a 3-8 membered heterocycle (contg. 1-4 heteroatoms selected from 1-4N, 1-2O and 1-2S, and in which 1-2 CH2 gps. are opt. replaced by CO), opt. C-substd. by R, 2-6C alkenyl, 2-6C alkynyl, RO, RS, 3-6C alkenyloxy, 3-6C alkynyloxy, 3-6C alkenylthio, 3-6C alkynylthio, ROCO, NO2, NH2, halo, 1-4C alkylamino, di(1-4C)alkylamino, CN, 1-6C cyanoalkyl, 1-6C haloalkyl or 1-6C haloalkyloxy; ACN, ACOB, OR9, C(O)R10, C(S)R10, C(NR16)R10, A = straight chain 2-4C alkenylene or 2-4C alkynylene, both opt. substd. by 1-2 halo, CN, R, 1-6C haloalkyl, OH, RO, RCOO, ROCO or RCO; B = H, R, 3-6C alkenyl, 3-6C alkynyl, 1-6C haloalkyl, 3-7C cycloalkyl, OR17, SR17, phenyl (opt. substd. by 1-3R, 2-6C alkenyl, halo, CN, NO2, 1-6C haloalkyl, RO or ROCO), 1-6C alkoxy-1-6C alkyl, di(1-6C alkoxy)-1-6C alkyl, 1-6C alkylthio-1-6C alkyl or NR18R19; R17 = H, R, 3-6C alkenyl, 3-6C alkynyl, 3-6C cycloalkyl, 1-6C haloalkyl, 1-6C cyanoalkyl, 3-6C haloalkenyl, ROCO, 1-6C alkoxy(1-6C)alkyl, 1-6C alkoxycarbonyl (1-6C) alkyl, 1-6C alkoxyimino(1-6C)alkyl, or phenyl (opt. substd. by 1-3 R, 2-6C alkenyl, halo, CN, NO2, 1-6C haloalkyl, RO or ROCO); R18, R19 = H, R, 3-6C alkenyl, 3-6C alkynyl, 3-6C cycloalkyl, 1-6C haloalkyl, RCO, ROCO, 1-6C alkoxy (1-6C)alkyl, or phenyl (opt. substd. by 1-3R, 3-6C alkenyl, halo, CN, NO2, RO or ROCO); R9 = 1-6C cyanoalkyl RQ, 1-6C haloalkyl, 3-6C haloalkenyl, 3-6C alkynyl, 3-6C haloalkynyl, 1-6 alkoxycarbonyl-2-6C alkyl, ROQOCOQ, 1-6C alkoxyimino (1-6C)alkyl, or phenyl, phenyl-Q, 3-8 membered heterocyclyl or heterocyclyl-Q (where the heterocycles contain 1-4 heteroatoms, etc.; R10 = H, CN, R, 3-6C alkenyl, 3-6C alkynyl, 1-6C haloalkyl, 3-7C cycloalkyl, ROCO, ROCOQ, or phenyl (opt. substd. by 1-3 halo, CN, NO2, R, 3-6C alkenyl, 1-6C haloalkyl, RO or ROCO); R16 = H, R, 3-6C alkenyl, 3-6C alkynyl, 3-7C cycloalkyl, 1-6C haloalkyl, phenyl (opt. substd. by 1-3R, halo, CN, 2-6C alkenyl, NO2, 1-6C haloalkyl, 1-6C alkoxy, or ROCO), ROQ, OH, RO, 3-6C alkenyloxy, 3-6C alkynyloxy, 5-7C cycloalkoxy, 5-7C cycloalkenyloxy, etc.; R5+R6 = an opt. unsatd. 3-5 membered carbon chain which opt. contains 1-2O, S, N, CO or 1-6C alkoximino gps. and which is opt. substd. by 1-2 CN, NO2, NH2, halo, R, 1-6C haloalkyl, 2-6C alkenyl, 2-6C alkynyl, 1-6C cyanoalkyl, RCOQ, phenyl-Q or 3-8 membered heterocyclyl-1-6C alkyl, where the heterocycle is opt. unsatd. and contains 1-4 heteroatoms selected from 1-4N, 1-20 and 1-2S; provided that when T is CONR1R2 then R9 is not 3-6C alkynyl and R16 is not 1-6C alkoxy, and when T is CN then R9 is not 1-6C haloalkoxy.

    257.
    发明专利
    未知

    公开(公告)号：AT178314T

    公开(公告)日：1999-04-15

    申请号：AT93909375

    申请日：1993-04-20

    Applicant: BASF AG

    Inventor： KLINTZ RALF ,  HEISTRACHER ELISABETH ,  SCHAEFER PETER ,  HAMBRECHT GERHARD ,  PLATH PETER ,  KARDORFF UWE ,  GERBER MATTHIAS ,  WESTPHALEN KARL-OTTO ,  WALTER HELMUT

    IPC: C07D317/30 ,  A01N37/30 ,  A01N37/32 ,  A01N37/34 ,  A01N37/46 ,  A01N43/08 ,  A01N43/12 ,  A01N43/16 ,  A01N43/18 ,  A01N43/28 ,  A01N43/32 ,  A01N43/38 ,  A01N43/40 ,  A01N43/74 ,  A01N43/78 ,  C07C233/57 ,  C07C233/60 ,  C07C233/61 ,  C07C233/62 ,  C07C233/63 ,  C07C237/42 ,  C07C251/48 ,  C07C251/60 ,  C07C255/13 ,  C07C255/24 ,  C07C255/42 ,  C07C255/46 ,  C07C255/58 ,  C07C271/62 ,  C07D209/48 ,  C07D295/185 ,  C07D307/12 ,  C07D307/90 ,  C07D309/06 ,  C07D335/02 ,  C07D339/06 ,  C07D339/08 ,  C07D401/10 ,  C07D413/06 ,  C07D413/10 ,  C07D417/06 ,  C07D417/10

    Abstract: Substd. cyclohexene-1,2-dicarboxylic acid derivs. of formula (I), and their salts are new. Where T = CONR1R2 or CN; R1, R2 = H; R, 3-6C alkenyl, or 3-6C alkynyl, all opt. substd. by 1-3 halo, CN, NH2, SH, OH, OR, RSO, RSO2, RCO, COOH, ROCO, RNH, (R)2N, RNHCO, (R)2NCO, (RO)(HO)PO, (RO)2PO, or Ar); or Ar' when R1 is H or R, R2 may also be OH, RO, 3-6C alkenyloxy, 3-6C alkynyloxy, 3-7C cycloalkoxy 5-7 cycloalkenyloxy, 1-6C haloalkoxy, 3-6C halo alkenyloxy, 3-7C cycloalkyl-1-6C alkoxy, RCOO, 1-6C cyanoalkoxy, etc.; NR1R2 = a 3-8 membered non-aromatic heterocycle contg. 1-3N atoms and/or one O or S atom and opt. 1-2 CO gps., the ring being opt. substd. by 1-3R; Ar = phenyl or a 3-8 membered heterocycle (contg. 1-4 heteroatoms selected from 1-4N, 1O or 1S) both opt. substd. on every substitutable atom by OH, halo, CN, NO2, CF3, R or RO; Ar' as Ar except that the heterocycle contains 1-4 heteroatoms selected from 1-4N, 1-20 and 1-2S, and only C-atoms may be substd. R = 1-6C alkyl; R3 = H or R; R4 = H or halo; R5 = H, halo, NO2, CN or CF3; R6 = a 3-8 membered heterocycle (contg. 1-4 heteroatoms selected from 1-4N, 1-2O and 1-2S, and in which 1-2 CH2 gps. are opt. replaced by CO), opt. C-substd. by R, 2-6C alkenyl, 2-6C alkynyl, RO, RS, 3-6C alkenyloxy, 3-6C alkynyloxy, 3-6C alkenylthio, 3-6C alkynylthio, ROCO, NO2, NH2, halo, 1-4C alkylamino, di(1-4C)alkylamino, CN, 1-6C cyanoalkyl, 1-6C haloalkyl or 1-6C haloalkyloxy; ACN, ACOB, OR9, C(O)R10, C(S)R10, C(NR16)R10, A = straight chain 2-4C alkenylene or 2-4C alkynylene, both opt. substd. by 1-2 halo, CN, R, 1-6C haloalkyl, OH, RO, RCOO, ROCO or RCO; B = H, R, 3-6C alkenyl, 3-6C alkynyl, 1-6C haloalkyl, 3-7C cycloalkyl, OR17, SR17, phenyl (opt. substd. by 1-3R, 2-6C alkenyl, halo, CN, NO2, 1-6C haloalkyl, RO or ROCO), 1-6C alkoxy-1-6C alkyl, di(1-6C alkoxy)-1-6C alkyl, 1-6C alkylthio-1-6C alkyl or NR18R19; R17 = H, R, 3-6C alkenyl, 3-6C alkynyl, 3-6C cycloalkyl, 1-6C haloalkyl, 1-6C cyanoalkyl, 3-6C haloalkenyl, ROCO, 1-6C alkoxy(1-6C)alkyl, 1-6C alkoxycarbonyl (1-6C) alkyl, 1-6C alkoxyimino(1-6C)alkyl, or phenyl (opt. substd. by 1-3 R, 2-6C alkenyl, halo, CN, NO2, 1-6C haloalkyl, RO or ROCO); R18, R19 = H, R, 3-6C alkenyl, 3-6C alkynyl, 3-6C cycloalkyl, 1-6C haloalkyl, RCO, ROCO, 1-6C alkoxy (1-6C)alkyl, or phenyl (opt. substd. by 1-3R, 3-6C alkenyl, halo, CN, NO2, RO or ROCO); R9 = 1-6C cyanoalkyl RQ, 1-6C haloalkyl, 3-6C haloalkenyl, 3-6C alkynyl, 3-6C haloalkynyl, 1-6 alkoxycarbonyl-2-6C alkyl, ROQOCOQ, 1-6C alkoxyimino (1-6C)alkyl, or phenyl, phenyl-Q, 3-8 membered heterocyclyl or heterocyclyl-Q (where the heterocycles contain 1-4 heteroatoms, etc.; R10 = H, CN, R, 3-6C alkenyl, 3-6C alkynyl, 1-6C haloalkyl, 3-7C cycloalkyl, ROCO, ROCOQ, or phenyl (opt. substd. by 1-3 halo, CN, NO2, R, 3-6C alkenyl, 1-6C haloalkyl, RO or ROCO); R16 = H, R, 3-6C alkenyl, 3-6C alkynyl, 3-7C cycloalkyl, 1-6C haloalkyl, phenyl (opt. substd. by 1-3R, halo, CN, 2-6C alkenyl, NO2, 1-6C haloalkyl, 1-6C alkoxy, or ROCO), ROQ, OH, RO, 3-6C alkenyloxy, 3-6C alkynyloxy, 5-7C cycloalkoxy, 5-7C cycloalkenyloxy, etc.; R5+R6 = an opt. unsatd. 3-5 membered carbon chain which opt. contains 1-2O, S, N, CO or 1-6C alkoximino gps. and which is opt. substd. by 1-2 CN, NO2, NH2, halo, R, 1-6C haloalkyl, 2-6C alkenyl, 2-6C alkynyl, 1-6C cyanoalkyl, RCOQ, phenyl-Q or 3-8 membered heterocyclyl-1-6C alkyl, where the heterocycle is opt. unsatd. and contains 1-4 heteroatoms selected from 1-4N, 1-20 and 1-2S; provided that when T is CONR1R2 then R9 is not 3-6C alkynyl and R16 is not 1-6C alkoxy, and when T is CN then R9 is not 1-6C haloalkoxy.

    PYRIDINE-2,3-DICARBOXYLICACIDIMIDES, PROCESS FOR THEIR PREPARATION AND HERBICIDES CONTAINING THEM AS ACTIVE INGREDIENT AND THEIR USE FOR WEED CONTROL
    258.
    发明专利
    PYRIDINE-2,3-DICARBOXYLICACIDIMIDES, PROCESS FOR THEIR PREPARATION AND HERBICIDES CONTAINING THEM AS ACTIVE INGREDIENT AND THEIR USE FOR WEED CONTROL 未知

    公开(公告)号：HU215269B

    公开(公告)日：1998-11-30

    申请号：HU9403721

    申请日：1994-12-21

    Applicant: BASF AG

    Inventor： GERBER MATTHIAS ,  HAMPRECHT GERHARD ,  MUENSTER PETER ,  WALTER HELMUT ,  WESTPHALEN KARL-OTTO

    IPC: A01N43/40 ,  A01N43/90 ,  C07D213/80 ,  C07D471/04 ,  C07D491/04 ,  C07D491/048 ,  A01N43/80 ,  A01N43/56

    Abstract: Pyridine-2,3-dicarboximides of formula (I) and their salts are new, except for 6-amino-5-cyano-4-phenyl-pyridine-2,3-dicarboximide. R1 = H, 1-4C alkoxy, 1-6C alkyl (substd. by 0-3 of 1-4C alkoxy, 1-4C haloalkoxy, 1-4C alkylthio, 1-4C haloalkylthio, 1-4C dialkylamino, 3-8C cycloalkyl and halogen), 3-8C cycloalkyl (substd. by 0-3 of 1-6C alkyl, 1-6C haloalkyl, 1-4C alkoxy, 1-4C haloalkoxy, halogen or NO2) or 3-6C alkenyl or alkynyl (both substd. by 0-3 halogen); provided that R1 is not dialkylaminoethyl when one of R2-R4 is NH2 or OH; at least one of R2-R4 is NO2, OR5, NR6R7 or NCS, any others = H, halogen NO2, CN 1-6C alkyl (substd. by 0-5 halogen atoms and/or 1-3 of 1-4C alkoxy, 1-4C haloalkoxy, 1-4C alkylthio, 1-4C haloalkylthio, 3-6C cycloalkyl or CN), Ar, 3-8C cycloalkyl (substd. by 0-3 of 1-4C alkyl or halogen), 2-6C alkenyl or 2-6C alkynyl (both substd. by 0-3 of halogen or 1-3C alkoxy and/or 0-1 of Ar), 1-4C alkoxy, 1-4C alkylthio, 1-4C haloalkoxy, 1-4C haloalkylthio, 1-4C alkylsulphinyl, 1-4C alkylsulphonyl, 1-4C haloalkylsulphonyl, 2-5C alkenyloxy, 2-5C alkynyloxy, OAr, SAr; 5- or 6-membered heterocyclyl (contg. 1-2 heteroatoms (O, S and/or N) and substd. by 0-3 of 1-3C alkyl, halogen, 1-3C alkoxy or 2-4C alkoxycarbonyl), phenyl (substd. by 0-3 of 1-6C alkyl, 1-6C haloalkyl, 1-6C alkoxy, 1-6C haloalkoxy, 1-6C alkylthio, 1-6C haloalkylthio, halogen, NO2 or CN), OR5, NR6R7 or NCS; R5 = H, 2-4C alkanoyl, 2-4C haloalkanoyl, 2-4C alkoxycarbonyl, (1-4C)alkoxy(2-4C)alkoxycarbonyl, mono- or di(1-4C alkyl)carbamoyl, 1-4C alkylsulphonyl, 1-4C haloalkylsulphonyl, SO2NH2, mono- or di(1-4C alkyl)sulphamoyl or SO2Ar; R6 = H, 1-4C alkyl, benzyl or 1-4C alkoxy; R7 = 1-4C alkyl or as defined for R5; Ar = benzyl (ring-substd. by 0-3 of 1-4C alkyl, 1-4C haloalkyl, 1-4C alkoxy, 1-4C haloalkoxy, 1-4C alkylthio, 1-4C haloalkylthio, halogen, CN or NO). Also claimed are new pyridine-2,3-dicarboxylic anhydride (IIa) and pyridine-2,3-dicarboxylate ester intermediates (III) (see 'Starting Materials').

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