PHENYLPROPYNYLOXYPYRIDINE HERBICIDES

Abstract: Compounds of formula (I) wherein the substituents R1, R2, R3 and R4, and the suffixes n and m are as defined in claim 1, and agrochemically acceptable salts and all stereoisomers and tautomers of such compounds are suitable for use as herbicides.

Description: Novel herbicides The present invention relates to novel, herbicidally active phenylalkynes, to a process for their preparation, to compositions comprising such compounds, and to the use thereof in controlling weeds, especially in crops of useful plants, or in inhibiting plant growth. Phenylalkynes having herbicidal action are described, for example, in JP-A-11 147 866. Novel phenylalkynes having herbicidal and growth-inhibiting properties have now been found. The present invention accordingly relates to compounds of formula I wherein n is O, 1 , 2, 3 or 4; each R. independently of any other(s) is halogen, -CN, -SCN, -SF 5 , -NO 2 , -NR 5 R 6 , -CO 2 R 7 . -CONRsRg, -C(R 10 )=NOR 11 , -COR12, -OR 13 , -SR 14j -SOR15, -SO 2 R 16 , -OSO2R17, C C 8 alkyl, C 2 -C 8 alkenyl, C 2 -C 8 alkynyl or C 3 -C 6 cycloalkyl; or C C 8 alkyl, C 2 -C 8 alkenyl or C 2 -C 8 alkynyl substituted by one or more halogen, -CN, -NO 2 , -NR 18 Rι 9 , -CO 2 R 2 o, -CONR 2 ιR 22 , -COR 23 , -C(R 24 )=NOR 25 , -C(S)NR 26 R 27) -C(C C 4 alkylthio)=NR 28 , -OR 29> -SR 30 , -SOR 3 ι, -SO 2 R 32 or C 3 -C 6 cycloalkyl substituents; or each Ri is C 3 -C 6 cycloalkyl substituted by one or more halogen, -CN, -NO 2 , -NR 18 R 19 , -CO 2 R 20 , -CONR 21 R 22 , -COR 23 , -C(R 24 )=NOR 25 , -C(S)NR 26 R 27 , -C(CrC 4 alkylthio)=NR 28 , -SR30, -SOR 31 , -SO 2 R 32 or C 3 -C 6 cycloalkyl substituents; or each R. independently of any other(s) is phenyl, which may itself be substituted by one or more halogen, C C 4 alkyl, d-C^haloalkyl, C C 4 alkoxy, -CN, -NO 2 , C C 4 alkylthio, C C 4 - alkylsulfinyl or CrC^lkylsulfonyl substituents; or two adjacent Ri together form a C C 7 alkylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by CrC 6 alkyl, the total number of ring atoms being at least 5 and a maximum of 9; or two adjacent R-j together form a C 2 -C 7 - alkenylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by C-j-Cealkyl, the total number of ring atoms being at least 5 and a maximum of 9; R 3 and R 4 are each independently of the other hydrogen, halogen, -CN, d-C alkyl or C C 4 - alkoxy; or R 3 and R 4 together denote C 2 -C 5 alkylene; R 5 is hydrogen or C C 8 alkyl; R 6 is hydrogen, CrC 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl; it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C C 4 alkyl, d-C 4 - haloalkyl, d-C 4 alkoxy, -CN, -NO 2> d-C 4 alkylthio, d-C 4 alkylsulfinyl or d-C 4 alkylsulfonyl substituents; or R 5 and R 6 together denote a C 2 -C 5 alkylene chain, which may be interrupted by an oxygen or sulfur atom; R 7 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or C*ι-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl substituted by one or more halogen, C C alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, d-C 4 alkyl, C C - haloalkyl, d-C 4 alkoxy, -CN, -NO 2 , d-C 4 alkylthio, C C 4 alkylsulfinyl or C C 4 alkylsulfonyl substituents; R 8 is hydrogen or C C 8 alkyl; R 9 is hydrogen or C C 8 alkyl, or C C 8 alkyl substituted by one or more COOH, d-C 8 - alkoxycarbonyl or -CN substituents, or R 9 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C C 4 alkyl, d-C 4 haloalkyl, C C 4 - alkoxy, -CN, -NO 2 , C C 4 alkylthio, C C 4 alkylsulfinyl or C r C 4 alkylsulfonyl substituents; or R 8 and R g together denote C 2 -C 5 alkylene; R 0 is hydrogen, d-C 4 alkyl, C C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 11 is hydrogen, CrC 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, C C 4 haloalkyl or C 3 -C 6 haloalkenyl; R 12 is hydrogen, Cι-C 4 alkyl, C C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 13 is hydrogen, C C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl; or R 13 is phenyl or phenyl-d-C 6 alkyl, it being possible for the phenyl ring itself to be substituted by one or more halogen, d-C 4 alkyl, C 1 -C 4 haloalkyl, d-C 4 alkoxy, -CN, -NO 2 or -3(0) 2 0! -C 8 alkyl substituents, or R 13 is d-C 8 alkyl substituted by one or more halogen, -CN or Cι-C 4 alkoxy substituents; Rι 4 is hydrogen, C-ι-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or C C 8 alkyl substituted by one or more halogen, -CN or Cι-C 4 alkoxy substituents; R 15 , R 16 and R 17 are each independently of the others Cι-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 - alkynyl, or Cι-C 8 alkyl substituted by one or more halogen, -CN or Cι-C alkoxy substituents; R 8 is hydrogen or -C 8 alkyl; R 19 is hydrogen, C C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C C 4 alkyl, d-C 4 haloalkyl, C C 4 alkoxy, -CN, -NO 2 , C C 4 alkylthio, C C 4 alkylsulfinyl or C C 4 alkyl- sulfonyl substituents; or R 18 and R 19 together denote a C -C 5 alkylene chain, which may be interrupted by an oxygen or sulfur atom; R 20 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C -C alkyl, d-C 4 haloalkyl, Cι-C 4 alkoxy, -CN, -NO 2 , d-C 4 a!kylthio, C C 4 alkylsulfinyl or C C 4 alkyl- sulfonyl substituents; R 21 is hydrogen or d-C 8 alkyl; R 22 is hydrogen or d-C 8 alkyl, or d-C 8 alkyl substituted by one or more COOH, d-C 8 - alkoxycarbonyl or -CN substituents, or R 22 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, Cι-C alkyl, d-C 4 haloalkyl, d-C 4 - alkoxy, -CN, -NO 2 , CrC 4 alkylthio, d-C 4 alkylsulfinyl or d-C 4 alkylsulfonyl substituents; or R 21 and R 22 together denote C -C 5 alkylene; R 23 is hydrogen, d-C alkyl, d-C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 24 is hydrogen, d-C 4 alkyl, Cι-C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 25 is hydrogen, C C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, d-C 4 haloalkyl or C 3 -C 6 haloalkenyl; R 2 6 is hydrogen or d-C 8 a!kyl; R 27 is hydrogen or d-C 8 alkyl, or d-C 8 alkyl substituted by one or more COOH, C C 8 - alkoxycarbonyl or -CN substituents, or R 27 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, C C 4 haloalkyl, C C 4 - alkoxy, -CN, -NO 2l C-j-C 4 alkylthio, C C 4 alkylsulfinyl or d-C 4 alkylsulfonyl substituents; or R 26 and R 27 together denote C 2 -C 5 alkylene; R 28 is hydrogen or Cι-C 8 alkyl; R 2 9 and R 30 are each independently of the other hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or d-C 8 alkyl substituted by one or more halogen, -CN or d-C alkoxy substituents; R 31 and R 32 are each independently of the other C r C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or CrC 8 alkyl substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; m is 0, 1 , 2, 3, 4 or 5; each R 2 independently of any other(s) is halogen, -CN, -SCN, -SF 5 , -NO 2) -NR 36 R 37 , -CO 2 R 38 , -CONR 39 R 4Q . -C(R 4 ι)=NOR 42 , -COR 43 , -OR^, -SR 45 , -SOR 46 , ~SO 2 R 47 , OSO 2 R 48 -N([CO]pR 49 )COR5o, -N(OR 51 )COR 52 , -N(R 53 )CO 2 R 5 or -N-phthalimide; R 36 is hydrogen or C C 8 alkyl; and R 37 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C C alkyl, C C 4 haloalkyl, C C 4 alkoxy, -CN, -NO 2 , d-C 4 alkylthio, C C 4 alkylsulfinyl or C C alkyl- sulfonyl substituents; or R 36 and R 37 together denote a C 2 -C 5 alkylene chain, which may be interrupted by an oxygen or sulfur atom; R 38 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or C C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl substituted by one or more halogen, C C alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, d-C alkyl, C C 4 - haloalkyl, Cι-C 4 alkoxy, -CN, -NO 2 , Cι-C 4 alkylthio, C C 4 alkylsulfinyl or C C 4 alkylsulfonyl substituents; R 39 is hydrogen or d-C 8 alkyl; R 0 is hydrogen or Cι-C 8 alkyl, or Cι-C 8 alkyl substituted by one or more -COOH, d-C 8 - alkoxycarbonyl or -CN substituents, or R 0 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, CrC 4 haloalkyl, d-C - alkoxy, -CN, -NO 2 , Cι-C alkylthio, C C 4 alkylsulfinyl or C C 4 alkylsulfonyl substituents; or R 39 and R 40 together denote C 3 -C 5 alkylene; R 1 is hydrogen, C C 4 alkyl, C C haloalkyl or C 3 -C 8 cycloalkyl; R 42 is hydrogen, Cι-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, d-C 4 haloalkyl or C 3 -C 6 haloalkenyl; R 43 is hydrogen, C C 4 alkyl, d-C 4 haloalkyl or C 3 -C 6 cycloalkyl; R^ is hydrogen, Cι-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl; or R^ is phenyl or phenyl-d-C 6 alkyl, it being possible for the phenyl ring itself to be substituted by one or more halogen, Cι-C 4 alkyl, d-C 4 haloalkyl, C C 4 alkoxy, -CN, -NO 2 or -S(O) 2 d-C 8 alkyl substituents, or I Λ is C C 8 alkyl substituted by one or more halogen, -CN or C C 4 alkoxy substituents; R 5 is hydrogen, Cι-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or C C 8 alkyl substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; R 6 , R and R 48 are each independently of the others C r C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 - alkynyl, or d-C 8 alkyl substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; p is 0 or 1 ; R 9, R50, R 51 , δ 2 , R 5 3 and R 54 are each independently of the others hydrogen, d-C 8 alkyl, or phenyl, which may itself be substituted by one or more halogen, d-C 8 alkyl, d-C 4 haloalkyl, d-C 4 alkoxy, -CN, -NO 2 , d-C 8 alkylthio, d-C 8 alkylsulfinyl or d-C 8 alkylsulfonyl substituents; or each R 2 independently of any other(s) is d-C 8 alkyl, or d-C 8 alkyl mono- or poly-substituted by halogen, -CN, -NO 2 , -NR 55 R 5 6, -CO 2 R 57 , -CONR 58 R 59 , -COR 60 , -C(R 61 )=NOR 62 , -C(S)NR 63 R 64 , -C(C C 4 alkylthio)=NR 65 , -OR 66 , -SR 67 , -SOR 68) -SO 2 R 69 , -O(SO 2 )R 70 , -N(R 71 )CO 2 R 72 , -N(R 73 )COR 74 or by C 3 -C 6 cycloalkyl; or each R 2 independently of any other(s) is C 2 -C 8 alkenyl, or C 2 -C 8 alkenyl mono- or poly- substituted by -CN, -NO 2 , -CO 2 R 75 , -CONR 76 R 77 , -COR 78 , -C(R 79 )=NOR 80 , -C(S)NR 81 R 82 , -C(CrC 4 alkylthio)=NR 83 or by C 3 -C 6 cycloalkyl; or each R 2 independently of any other(s) is C 2 -C 8 alkynyl, or C 2 -C 8 alkynyl mono- or poly- substituted by halogen, -CN, -CO 2 R 84 , -CONR 85 R 86 , -COR 87 , -C(R 88 )=NOR 89 , -C(S)NR 90 R g ι, -C(C C 4 alkylthio)=NR 92 or by C 3 -C 6 cycloalkyl; or each R 2 independently of any other(s) is C 3 -C 6 cycloalkyl, or C 3 -C 6 cycloalkyl mono- or poly- substituted by halogen, -CN, -CO 2 R 93 , -CONR 94 R 9 5, -COR 96 , -C(R 97 )=NOR 98 , -C(S)NR 99 R 100 or by -C(d-C 4 alkylthio)=NR 10 ι; or two adjacent R 2 together form a d-C 7 alkylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by d-C 6 alkyl, the total number of ring atoms being at least 5 and a maximum of 9; or two adjacent R 2 together form a C 2 -C 7 - alkenylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by d-C 6 alkyl, the total number of ring atoms being at least 5 and a maximum of 9; R 55 is hydrogen or d-C 8 alkyl; R 56 is hydrogen, C C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, Cι-C 4 haloalkyl, d-C 4 alkoxy, -CN, -NO 2 , d-C alkylthio, C C alkylsulfinyl or C C 4 alkyl- sulfonyl substituents; or R 55 and R 56 together denote a C 2 -C 5 alkylene chain, which may be interrupted by an oxygen or sulfur atom; R 57 is hydrogen, C r C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or C C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl substituted by one or more halogen, C C alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, d-C 4 alkyl, C C 4 - haloalkyl, C C 4 alkoxy, -CN, -NO 2 , C C 4 alkylthio, C C alkylsulfinyl or d-C 4 a!kylsulfonyl substituents; R 58 is hydrogen or Cι-C 8 alkyl; R 59 is hydrogen or Cι-C 8 alkyl, or CrC 8 alkyl substituted by one or more -COOH, d-C 8 - alkoxycarbonyl or -CN substituents; or R 59 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C C 4 alkyl, d-C 4 haloalkyl, d-C 4 - alkoxy, -CN, -NO 2 , d-C 4 alkylthio, C 1 -C 4 alkylsulfinyl or C C 4 alkylsulfonyl substituents; or R 58 and R 59 together denote C 2 -C 5 alkylene; R 60 is hydrogen, d-C alkyl, d-C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 61 is hydrogen, C C 4 alkyl, C C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 62 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, d-C 4 haloalkyl or C 3 -C 6 haloalkenyl; and R 63 is hydrogen or d-C 8 alkyl; R 64 is hydrogen or d-C 8 alkyl, or d-C 8 alkyl substituted by one or more -COOH, Cι-C 8 - alkoxycarbonyl or -CN substituents; or R 6 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, C 1 -C 4 haloalkyl, d-C 4 - alkoxy, -CN, -NO 2 , d-C 4 alkylthio, C C 4 alkylsulfinyl or C r C 4 alkylsulfonyl substituents; or R 63 and R 64 together denote C 2 -C 5 alkylene; R 65 is hydrogen or d-C 8 alkyl; R 66 and R 67 are each independently of the other hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 - alkynyl, or C C 8 alkyl substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; R 68 , R 69 and R 70 are each independently of the others d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 - alkynyl, or C C 8 alkyl substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; R 71 and R 73 are each independently of the other hydrogen, C C 8 alkyI or C C 8 alkoxy; R 72 is C C 8 alkyl; R 74 is hydrogen or C C 8 alkyl; R 75 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, each of which may be mono- or poly-substituted by one or more halogen, C C 4 alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, d-C 4 alkyl, d-C 4 - haloalkyl, C C 4 alkoxy, -CN, -NO 2 , d-C alkylthio, C C 4 alkylsulfinyl or C C 4 alkylsulfonyl substituents; R 76 is hydrogen or d-C 8 alkyl; R 77 is hydrogen or d-C 8 alkyl, or C C 8 alkyl substituted by one or more -COOH, Cι-C 8 - alkoxycarbonyl or -CN substituents; or R 77 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, d-C 4 haloalkyl, d-C 4 - alkoxy, -CN, -NO 2 , C C 4 alkylthio, d-C 4 alkylsulfinyl or d-C 4 alkylsulfonyl substituents; or R 76 and R 77 together denote C 2 -C 5 alkylene; R 78 and R 79 are each independently of the other hydrogen, Cι-C 4 alkyl, CrC 4 haloalkyl or C 3 -C 6 cycloalkyl; R 80 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, d-C 4 haloalkyI or C 3 -C 6 haloalkenyl; R 8 ι is hydrogen or C C 8 alkyI; R 82 is hydrogen or C C 8 alkyl, or d-C 8 alkyl substituted by one or more -COOH, C C 8 - alkoxycarbonyl or -CN substituents; or R 82 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, d-C haloalkyl, d-C 4 - alkoxy, -CN, -NO 2 , C C 4 alkylthio, d-C 4 alkylsulfinyl or d-C alkylsulfonyl substituents; or R 81 and R 82 together denote C 2 -C 5 alkylene; R 83 is hydrogen or C C 8 alkyl; R 84 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, each of which may be mono- or poly-substituted by one or more halogen, d-C alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, C-ι-C 4 alkyl, d-C 4 - haloalkyl, d-C 4 alkoxy, -CN, -NO 2 , Cι-C 4 alkylthio, d-C 4 alkylsulfinyl or d-C 4 alkylsulfonyi substituents; R 85 is hydrogen or C C 8 alkyl; R 86 is hydrogen or C C 8 alkyl, or d-C 8 alkyl substituted by one or more -COOH, C C 8 - alkoxycarbonyl or -CN substituents; or R 86 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C alkyl, d-C 4 haloalkyl, C C 4 - alkoxy, -CN, -NO 2 , C C alkylthio, d-C 4 alkylsulfinyl or C C 4 alkylsulfonyl substituents; or R 85 and R 86 together denote C 2 -C 5 alkylene; R 87 is hydrogen, C C 4 alkyl, C C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 88 is hydrogen, C C 4 alkyl, C C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 89 is hydrogen, C C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, Cι-C 4 haloalkyl or C 3 -C 6 haloalkenyl; Rgo is hydrogen or d-C 8 alkyl; R 91 is hydrogen or C C 8 alkyl, or d-C 8 alkyl substituted by one or more -COOH, C C 8 - alkoxycarbonyl or -CN substituents; or R 91 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, C 1 -C 4 haloalkyl, d-C 4 - alkoxy, -CN, -NO 2l C C 4 alkylthio, d-C 4 alkylsulfinyl or Cι-C 4 alkylsulfonyl substituents; or R 90 and R 91 together denote C 2 -C 5 alkylene; R 92 is hydrogen or d-C 8 alkyl; R 93 is hydrogen, C -C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, each of which may be mono- or poly-substituted by one or more halogen, d-C alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, Cι-C alkyl, d-C 4 - haloalkyl, d-C 4 alkoxy, -CN, -NO 2 , Cι-C 4 alkylthio, d-C 4 alkylsulfinyl or C C 4 alkylsulfonyl substituents; Rg is hydrogen or Cι-C 8 alkyl; R g5 is hydrogen or d-C 8 alkyl, or C r C 8 alkyl substituted by one or more -COOH, d-C 8 - alkoxycarbonyl or -CN substituents; or R 95 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, C C haloalkyl, C C 4 - alkoxy, -CN, -NO 2 , d-C 4 alkylthio, C C 4 alkylsulfinyl or C C 4 alkylsulfonyI substituents; or R 94 and R 95 together denote C 2 -C 5 alkylene; R g6 is hydrogen, d-C alkyl, CrC 4 haloalkyl or C 3 -C 6 cycloalkyl; R 97 is hydrogen, Cι-C 4 alkyl, d-dhaloalkyl or C 3 -C 6 cycloalkyl; R 98 is hydrogen, Cι-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, d-C 4 haloalkyl or C 3 -C 6 haloalkenyl; R 99 is hydrogen or d-C 8 alkyl; R 1 00 is hydrogen or d-C 8 alkyl, or d-C 8 alkyl substituted by one or more -COOH, C-rC 8 - alkoxycarbonyl or -CN substituents; or R 1 0 0 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, Cι-C 4 alkyl, d-C ha!oalkyl, d-C - alkoxy, -CN, -NO 2 , d-C 4 alkylthio, d-C alkylsulfinyl or Cι-C 4 alkylsulfonyl substituents; or R 99 and R 10 o together denote C 2 -C 5 alkylene; and R10 1 is hydrogen or C C 8 alkyl, and to agrochemically acceptable salts and all stereoisomers and tautomers of the compounds of formula I. When n is 0, all the free valences on the pyridine ring of the compounds of formula I are substituted by hydrogen. When m is 0, all the free valences on the phenyl ring of the compounds of formula I are substituted by hydrogen. Examples of substituents that are formed when R 5 and R 6 together or R 18 and R 19 together or R 36 and R 37 together or R 55 and R 56 together denote a C 2 -C 5 alkylene chain, which may be interrupted by an oxygen or sulfur atom, are piperidine, morpholine, thiomorpholine and pyrrolidine. The alkyl groups occurring in the definitions of substituents may be straight-chain or branched and are, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl, and the pentyl, hexyl, heptyl, octyl, nonyl and decyl isomers. Halogen is fluorine, chlorine, bromine or iodine, preferably fluorine or chlorine. Haloalkyl is, for example, fluoromethyl, difluoromethyl, trifluoromethyl, chloromethyl, dichloromethyl, trichloromethyl, 2,2,2-trifluoroethyl, 2-fluoroethyl, 2-chloroethyI, pentafluoroethyl, 1 ,1-difluoro- 2,2,2-trichloroethyl, 2,2,3,3-tetrafluoroethyl or 2,2,2-trichloroethyl; preferably trichloromethyl, difluorochloromethyl, difluoromethyl, trifluoromethyl or dichlorofluoromethyl. Alkoxy groups preferably have a chain length of from 1 to 6, especially from 1 to 4, carbon atoms. Alkoxy is, for example, methoxy, ethoxy, propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy or tert-butoxy, and the pentyloxy and hexyloxy isomers; preferably methoxy or ethoxy. Alkoxy, alkenyl, alkynyl, alkoxyalkyl, alkylthio, alkylsulfonyl, alkylsulfinyl, alkylaminoalkoxy, alkoxycarbonyl, alkylcarbonyloxy, alkenylthio, alkenylsulfonyl, alkenylsulfinyl, alkynyl-sulfonyl, alkynylthio and alkynylsulfinyl groups are derived from the mentioned alkyl radicals. The alkenyl and alkynyl groups may be mono- or poly-unsaturated. Alkenyl is to be understood as meaning, for example, vinyl, allyl, methallyl, 1 -methylvinyl or but-2-en-1-yl. Alkynyl is, for example, ethynyl, propargyl, but-2-yn-1 -yl, 2-methylbutyn-2-yl or but-3-yn-2-yl. Alkylthio groups preferably have a chain length of from 1 to 4 carbon atoms. Alkylthio is, for example, methylthio, ethylthio, propylthio, isopropylthio, n-butylthio, isobutylthio, sec-butyl- thio or tert-butylthio, preferably methylthio or ethylthio. Alkylsulfinyl is, for example, methylsulfinyl, ethylsulfinyl, propylsulfinyl, isopropylsulfinyl, n-butylsulfinyl, isobutylsulfinyl, sec-butylsulfinyl or tert-butylsulfinyl; preferably methylsulfinyl or ethylsulfinyl. Alkylsulfonyl is, for example, ethylsυlfonyl, ethylsulfonyl, propylsulfonyl, isopropylsulfonyl, n-butylsulfonyl, isobutylsulfonyl, sec-butylsulfonyl or tert-butylsulfonyl; preferably methylsulfonyl or ethylsulfonyl. Alkoxyalkyl groups preferably have from 1 to 6 carbon atoms. Alkoxyalkyl is, for example, methoxymethyl, methoxyethyl, ethoxymethyl, ethoxyethyl, n-propoxymethyl, n-propoxyethyl, isopropoxymethyl or isopropoxyethyl. Substituents wherein two adjacent Ri together form a C C 7 alkylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by d-C 6 alkyl, the total number of ring atoms being at least 5 and a maximum of 9; or wherein two adjacent R. together form a C 2 -C 7 alkenylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by d-C 6 alkyl, the total number of ring atoms being at least 5 and a maximum of 9, have, for example, the following structures : Substituents wherein two adjacent R 2 together form a d-C 7 alkylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by d-C 6 alkyl, the total number of ring atoms being at least 5 and a maximum of 9; or wherein two adjacent R 2 together form a C 2 -C 7 alkenylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by C-ι-C 6 alkyl, the total number of ring atoms being at least 5 and a maximum of 9, have, for example, the following structures : The invention also includes the salts that the compounds of formula I are able to form preferably with amines, alkali metal and alkaline earth metal bases or quaternary ammonium bases. Suitable salt formers are described, for example, in WO 98/41089. Of the alkali metal and alkaline earth metal hydroxides as salt formers, special mention may be made of the hydroxides of lithium, sodium, potassium, magnesium or calcium, but especially those of sodium or potassium. As examples of amines suitable for the formation of ammonium salts, there come into consideration both ammonia and primary, secondary and tertiary d-Cι 8 aIkylamines, Cι-C 4 - hydroxyalkylamines and C 2 -C 4 alkoxyalkylamines, for example methylamine, ethylamine, n-propylamine, isopropylamine, the four isomeric butylamines, n-amylamine, isoamylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, pentadecylamine, hexadecylamine, heptadecylamine, octadecylamine, methyl-ethylamine, methyl-iso- propylamine, methyl-hexylamine, methyl-nonylamine, methyl-pentadecylamine, methyl- octadecylamine, ethyl-butylamine, ethyl-heptylamine, ethyl-octyla ine, hexyl-heptylamine, hexyl-octylamine, dimethylamine, diethylamine, di-n-propylamine, diisopropylamine, di-n- butylamine, di-n-amylamine, diisoamylamine, dihexylamine, diheptylamine, dioctylamine, ethanolamine, n-propanolamine, isopropanolamine, N,N-diethanolamine, N-ethylpropanol- amine, N-butylethanolamine, allylamine, n-butenyl-2-amine, n-pentenyl-2-amine, 2,3- dimethylbutenyl-2-amine, dibutenyl-2-amine, n-hexenyl-2-amine, propylenediamine, trimethylamine, triethylamine, tri-n-propylamine, triisopropylamine, tri-n-butylamine, triiso- butylamine, tri-sec-butylamine, tri-n-amylamine, methoxyethylamine and ethoxyethylamine; heterocyclic amines, e.g. pyridine, quinoline, isoquinoline, morpholine, piperidine, pyrrolidine, indoline, quinuclidine and azepine; primary arylamines, e.g. anilines, methoxyanilines, ethoxyanilines, o-, m- and p-toluidines, phenylenediamines, benzidines, naphthylamines and o-, m- and p-chloroanilines; but especially triethylamine, isopropylamine and diisopropylamine. Preferred quarternary ammonium bases that are suitable for salt formation correspond, for example, to the formula [N(R a R_R c R d )]OH, wherein R a , R , R c and R d are each independently of the others C C 4 alkyl. Other suitable tetraalkylammonium bases with other anions can be obtained, for example, by anion exchange reactions. Preferred compounds of formula I are those wherein each R T independently of any other(s) is halogen, -CN, -NO 2 , -C(R 10 )=NORn, -OR 13 , -SO 2 R 16 , -OSO 2 Rι 7 , Cι-C 8 alkyl or C 2 -C 8 alkenyl, or C C 8 alkyl substituted by one or more halogen or -CN substituents; R 10 is hydrogen or d-C alkyl; and R-i-i is Cι-C 8 alkyl. Preference is given also to those compounds of formula I wherein each R 2 independently of any other(s) is halogen, -CN, -NO 2 , -NR 36 R 37 , -CO 2 R 38 , -C(R 41 )=NOR 42 , -OR44, -SO 2 R 47 , -OSO 2 R 48 , d-C 8 alkyl, or d-C 8 alkyl mono- or poly- substituted by halogen, -CN or by -CO 2 R 57 ; R 36 and R 37 are hydrogen; R 38 is hydrogen or d-C 8 alkyl; R 41 is hydrogen or d-C 4 aikyl; and R 42 is d-C 8 alkyl. ln an especially preferred group of compounds of formula I, each R. independently of any other(s) is halogen, -CN, -NO 2 , -C(Rιo)=NORn, -OR 13 , -SO 2 Rι 6 , -OSO 2 R 17 , C C 8 alkyl or C 2 -C 8 alkenyl, or C C 8 alkyl substituted by one or more -CN substituents; Rio is hydrogen or d-C 4 alkyl; Rn is C C 8 alkyl; each R 2 independently of any other(s) is halogen, -CN, -NO 2 , -NR 36 R 37 , -CO R 38 , -C(R 41 )=NOR 42 , -OR^, -SO 2 R 47 , -OSO 2 R 8 or C C 8 alkyl, or C C 8 alkyl mono- or poly- substituted by -CN or by -CO 2 R57; R 36 and R 37 are hydrogen; R 38 is hydrogen or Cι-C 8 alkyl; R 41 is hydrogen or d-C 4 alkyl; R 2 is C C 8 alkyl; and R 3 and R 4 are each independently of the other hydrogen or d-C 4 alkyl. Also of interest are compounds of formula I wherein Ri is halogen, -CN, CrC 8 alkyl substituted by -CN, or d-C 8 alkoxy. Very special preference is given to those compounds of formula I wherein R 2 is halogen, -CN, d-C 8 alkyl substituted by -CN, or Cι-C 8 alkoxy, at least one of the substituents R, and R 2 being especially d-C 8 alkyl substituted by -CN. Preference is given also to compounds of formula I wherein n is 0, 1 or 2, and m is 0, 1 , 2, 3 or 4, n being especially 1 or 2, and m being especially 1 or 2. Of particular interest are compounds of formula I wherein R 3 and R 4 are hydrogen. In an outstanding group of compounds of formula I, the group occupies the 2-position on the pyridine ring, n being especially 1 or 2, and occupying especially the 3- and/or 5-position on the pyridine ring. Preference is given also to compounds of formula I wherein m is 1 or 2, and R 2 occupies the 3-position on the phenyl ring. Special mention may be made also of compounds of formula I, wherein Ri is hydrogen, fluorine, chlorine, bromine, methoxy, difluoromethoxy, trifluoromethyl or isopropylthio; R 2 is cyanomethyl, chlorine or bromine; R 3 and R 4 are hydrogen; n is 1 or 2, and m is 1. The compounds of formula I can be prepared by processes known perse described, for example, in J. Chem. Soc. Perkin Trans. 1979, pages 2756-2761 ; Synth. Commun. 1988, 18, pages 1111 -1118; J. Org Chem. 1996, 61 , pages 4258-4261 ; and K. Sonogashira, Comprehensive Organic Synthesis 1991 , Vol. 3, page 521 , for example, by reacting a compound of formula II wherein R, is as defined for formula I, in the presence of a base, with a compound of formula III wherein R 3 and R 4 are as defined for formula I and X, is O-tosyl, chlorine, bromine or iodine, to form a compound of formula IV wherein R^ R 3 and R 4 are as defined for formula I, and then coupling that compound, in the presence of a palladium catalyst, with a compound of formula V wherein R 2 is as defined for formula I and A is a leaving group, such as halogen or trifluoromethanesulfonate. The preparation of the compounds of formula I can be carried out, for example, in accordance with Reaction Schemes 1 , 2, 3, 4, 5 and 6. For the individual synthesis schemes, it is generally the case that different R. substituents may already be present at the start, or can be introduced in succession, for example by nucleophilic substitution. According to Reaction Scheme 1 , the compounds of formula I can be obtained, for example, from substituted pyridyl propargyl ethers of formula IV. The propargyl ethers of formula IV can be obtained in advance by alkylation of hydroxypyridines of formula II, which are reacted with acetylene derivatives III in the presence of a base. Such alkylations are standard procedures and can be carried out, for example, analogously to J. Chem. Soc. Perkin Trans. 1979, pages 2756-2761 ; Synth. Commun. 1988, 18, pages 1111 -1118; and J. Org Chem. 1996, 61 , pages 4258-4261. In the next Step, the propargyl ethers of formula IV are coupled with substituted aryls of formula V under typical Sonogashira conditions (K.Sonogashira, Comprehensive Organic Synthesis 1991 , Vol. 3, page 521 ). As catalyst mixtures there come into consideration, for example, tetrakistriphenylphosphinepalladium or bistriphenylphosphinepalladium dichloride together with copper iodide; as bases (for the reductive elimination) there come into consideration preferably amines, for example triethylamine, diethylamine or diisopropyl- ethylamine. The aryls of formula V preferably carry a leaving group A, wherein A is, for example, halogen (N. Krause et al., J. Org. Chem. 1998, 63, page 8551 ; and Nakamura, H. et ai, Tetrahedron Lett. 2000, 41 , page 2185) or trifluoromethanesulfonate (Ritter, K., Synthesis 1993, page 735). As solvents there are customarily used ethers, for example tetra-hydrofuran, chlorinated hydrocarbons, for example chloroform, or dipolar aprotic solvents, for example dimethylformamide or dimethyl sulfoxide. Scheme 1 alkylation The Pd-catalysed cross-coupling of suitably substituted benzenes of formula V with propargyl alcohols or terminal acetylenes of formula VI is generally known as a Sonogashira reaction (Reaction Scheme 2). That reaction has already been depicted in detail (see above, Scheme 1 ) and can also be used for the preparation of the phenylpropargyl alcohols of formula VII. The activation of the alcohol of formula VII is achieved, for example, by tosylation or halogenation. The tosylation of the alcohol of formula VII is a standard reaction and can be carried out, for example, with a sulfonic acid chloride, for example mesyl chloride or para- toluenesulfonic acid chloride (p-TosCI) in the presence of an amine, for example diethyl- amine, triethylamine or pyridine, in a solvent, e.g. a chlorinated hydrocarbon, for example carbon tetrachloride or methylene chloride, or an amine, for example pyridine. Such reactions are generally known and are described, for example, in J. Org. Chem. 1997, 62, page 8987; J. Het. Chem. 1995, 32, pages 875-882; and Tetrahedron Lett. 1997, 38, pages 8671-8674. The halogenation can be carried out analogously to standard procedures. For example, bromination is effected using carbon tetrabromide in the presence of triphenylphosphine (Synthesis 1998, pages 1015-1018) in methylene chloride. Chlorination is effected using mineral acids, for example using concentrated hydrochloric acid (J. Org. Chem. 1955, 20, page 95) or using para-toluenesulfonic acid chloride in the presence of an amine, for example triethylamine, in a solvent, for example methylene chloride (Tetrahedron Lett. 1984, 25, page 2295). The preparation of the phenyl-propynyloxy-pyridines of formula I can be carried out analogously to Synthesis 1995, pages 707-712; and Tetrahedron Lett. 1994, 35, pages 6405-6408 by means of copper iodide-catalysed alkylation. Suitable solvents are dimethylformamide and acetonitrile; suitable bases are preferably potassium carbonate and 1 ,8-diazabicylo[5.4.0]-undec-7-ene (DBU). Scheme 2 Sonogashira: tosylation or halogenation V: A = halogen, O-SO 2 -CF 3 VII VIII: χ 1 = halogen, OTs Compounds of formula I can also be obtained according to other methods (see Scheme 3 ). Scheme 3 X V: A = -I, -OTs, -0-S0 2 CF, XIII: X i = halogen, OTs Phenylacetylene esters of formula X can be obtained by means of Sonogashira coupling from the compounds of formula IX and activated benzene derivatives of formula V. The esters of formula X can then be reduced or reacted with organometal compounds, for example Grignard reagents, to form the alcohols of formula VII. The reduction can be carried out preferably with hydrides according to standard methods, for example with lithium aluminium hydride or sodium borohydride in a solvent, e.g. an ether, for example diethyl ether, dioxane or tetrahydrofuran, or an alcohol, for example methanol or ethanol. Such reductions are described, for example, in C. Ferri, "Reaktionen der organischen Synthese" 1978, pages 98-102. Reactions of carboxylic acid esters with Grignard reagents are standard in organic synthesis chemistry and are described in detail, for example, in "Organikum" 1976, pages 617-625. The subsequent etherification of the pyridyl derivatives of formula II to form the compounds of formula I has already been depicted in detail in Scheme 2. Further methods of preparing the compounds of type I are shown in Scheme 4 (variant of Scheme 3). Scheme 4 XI Xa reduction, e.g. LiAIH 4 or organometal compounds, e.g. Grignard reagents The reaction of phenylacetylenes of formula XI with methyllithium and subsequent reaction with chloroformic acid ethyl ester of formula XII yields the ester of formula Xa, which can be converted to the compounds of type I via an alcohol of formula VII in a manner completely analogous to that already shown in Scheme 3 (Tetrahedron. Lett. 1992, 33, page 4495). The nucleophilic aromatic substitution of the pyridine derivatives of formula XIV, wherein X 2 is halogen (Reaction Scheme 5) can be carried out analogously to known procedures, as described, for example, in J. March, "Advanced Organic Chemistry" 4th Edition, John Wiley & Sons, New York, 1992, pages 641 -676. Accordingly the pyridine derivative of formula XIV is reacted with a propargyl alcohol of formula VII in an aprotic solvent, e.g. an amide, for example N,N-dimethylformamide (DMF) or 1 -methyl-2-pyrrolidone (NMP), a sulfoxide, for example dimethyl sulfoxide (DMSO), a ketone, for example acetone, or an ether, for example tetrahydrofuran (THF), in the presence of a base, e.g. a carbonate, for example potassium or caesium carbonate, or a metal hydride, for example sodium hydride, at temperatures of from 0°C to 100°C (see also EP-A-0 759 429). Scheme 5 nucleophilic substitution XIV: X 2 = halogen Compounds of formula I can also be prepared by first reacting the propargyl alcohols of formula XV with the pyridine derivatives of formula XIV to form compounds of formula XVI and only then in the next synthesis step carrying out a Sonogashira reaction with activated benzene derivatives of formula V (Reaction Scheme 6). Scheme 6 nucleophilic substitution: xiv: X = halogen XVI Sonogashira coupling For the individual reaction steps (Schemes 1 to 6) the following applies: The reactions to form compounds of formula I are advantageously carried out in aprotic, inert organic solvents. Such solvents are hydrocarbons, such as benzene, toluene, xylene or cyclohexane, chlorinated hydrocarbons, such as dichloromethane, trichloromethane, tetrachloromethane or chlorobenzene, ethers, such as diethyl ether, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, tetrahydrofuran or dioxane, nitriles, such as acetonitrile or propionitrile, or amides, such as N,N-dimethylformamide, diethylformamide or N-methylpyrrolidinone. The reaction temperatures are preferably from -20°C to +120°C. The reactions are generally slightly exothermic and can usually be carried out at room temperature. In order to shorten the reaction time or to initiate the reaction, it is optionally possible to heat the reaction mixture for a short time up to boiling point. The reaction times can also be reduced by the addition of a few drops of base as reaction catalyst. Suitable bases are especially tertiary amines, such as trimethylamine, triethylamine, quinuclidine, 1 ,4- diazabicyclo[2.2.2]octane, 1 ,5-diazabicyclo[4.3.0]non-5-ene or 1 ,5-diazabicyclo[5.4.0]-undec- 7-ene. The bases used can, however, also be inorganic bases, such as hydrides, such as sodium or calcium hydride, hydroxides, such as sodium or potassium hydroxide, carbonates, such as sodium or potassium carbonate, or hydrogen carbonates, such as potassium or sodium hydrogen carbonate. The compounds of formula I can be isolated in customary manner by concentration and/or evaporation of the solvent and can be purified by recrystallisation or trituration of the solid residue in solvents in which they are not readily soluble, such as ethers, aromatic hydrocarbons or chlorinated hydrocarbons. For the use of the compounds of formula I according to the invention or compositions comprising them, there are suitable any of the methods of application customary in agriculture, such as preemergence application, postemergence application and seed dressing, as well as various methods and techniques, such as the controlled release of active ingredient. In the latter method, the compound is applied in solution to mineral granule carriers or polymerised granules (urea/formaldehyde) and dried. Where appropriate, it is possible in addition to apply a coating (coated granules) which allows the active ingredient to be released in metered amounts over a specific period. The compounds of formula 1 can be used as herbicides in unmodified form, i.e. as obtained during synthesis, but are preferably formulated in customary manner together with the adjuvants conventionally employed in formulation technology, e.g. into emulsifiable concentrates, directly sprayable or dilutable solutions, dilute emulsions, wettable powders, soluble powders, dusts, granules and microcapsules. Such formulations are described, for example, in WO 97/34485 on pages 9 to 13. As with the nature of the compositions, the methods of application, such as spraying, atomising, dusting, wetting, scattering or pouring, are chosen in accordance with the intended objectives and the prevailing circumstances. The formulations, i.e. the compositions, preparations or mixtures comprising the compound of formula I or at least one compound of formula I and generally one or more solid or liquid formulation adjuvants, are prepared in known manner, e.g. by intimately mixing and/or grinding the active ingredients with the formulation adjuvants, e.g. solvents or solid carriers. Surface-active compounds (surfactants) may additionally be used in the preparation of the formulations. Examples of solvents and solid carriers are given, for example, in WO 97/34485 on page 6. Depending on the nature of the compound of formula I to be formulated, suitable surface- active compounds are non-ionic, cationic and/or anionic surfactants and surfactant mixtures having good emulsifying, dispersing and wetting properties. Examples of suitable anionic, non-ionic and cationic surfactants are listed, for example, in WO 97/34485 on pages 7 and 8. The surfactants customarily employed in formulation technology, which are described inter alia in "McCutcheon's Detergents and Emulsifiers Annual" MC Publishing Corp., Ridgewood New Jersey, 1981 , Stache, H., "Tensid- Taschenbuch", Carl Hanser Verlag, Munich/Vienna, 1981 and M. and J. Ash, "Encyclopedia of Surfactants", Vol l-lll, Chemical Publishing Co., New York, 1980-81 , are also suitable for the preparation of the herbicidal compositions according to the invention. The herbicidal formulations generally contain from 0.1 to 99 % by weight, especially from 0.1 to 95 % by weight, herbicide, from 1 to 99.9 % by weight, especially from 5 to 99.8 % by weight, of a . solid or liquid formulation adjuvant and from 0 to 25 % by weight, especially from 0.1 to 25 % by weight, of a surfactant. Whereas commercial products are preferably formulated as concentrates, the end user will normally employ dilute formulations. The compositions may also comprise further ingredients such as stabilisers, e.g. vegetable oils and epoxidised vegetable oils (epoxidised coconut oil, rape oil or soybean oil), anti-foams, e.g. silicone oil, preservatives, viscosity regulators, binders and tackifiers, as well as fertilisers or other active ingredients. The compounds of formula I are usually applied to the plants or to the locus thereof at rates of application of from 0.001 to 4 kg/ha, especially from 0.005 to 2 kg/ha. The concentration required to achieve the desired action can be determined by experimentation. It will depend on the type of action, the development stage of the crop plant and of the weed, as well as on the application (locus, time, method) and, in dependence on those parameters, can vary over a wide range. The compounds of formula I are distinguished by herbicidal and growth-inhibiting properties, which make them suitable for use in crops of useful plants, especially in cereals, cotton, soybeans, sugar beet, sugar cane, plantation crops, rape, maize and rice, and for the non- selective control of weeds. Crops will be understood to include also those crops that have been made tolerant to herbicides or classes of herbicides by conventional breeding or genetic engineering methods. The weeds to be controlled may be monocotyledonous as well as dicotyledonous weeds, for example Stellaria, Nasturtium, Agrostis, Digitaria, Avena, Setaria, Sinapis, Lolium, Solanum, Echinochloa, Scirpus, Monochoria, Sagittaria, Bromus, Alopecurus, Sorghum halepense, Rottboellia, Cyperus, Abutilon, Sida, Xanthium, Amaranthus, Chenopodium, Ipomoea, Chrysanthemum, Galium, Viola and Veronica. The following Examples illustrate the invention further, but do not limit the invention. Preparation Examples: Example P1 : Preparation of 3.5-dichloro-2-(prop-2-vnyloxy)-pyridine: 1.25 g (0.029 mol) of NaH (55 %) are placed in 30 ml of pentane. After 15 minutes' stirring under nitrogen, the solvent is removed by syringe. 20 ml of absolute THF are then added and 1.65 ml (0.028 mol) of propargyl alcohol are added dropwise over a period of about 5 minutes at a temperature of 0°C. When the addition is complete, the ice-cooling is removed and stirring is continued for a further one hour at a temperature of about 45°C until the evolution of gas has ceased. 4.8 g (0.025 mol) of 2,3,5-trichloropyridine dissolved in 5 ml of THF are then added dropwise, with stirring, at 45°C. Stirring is then carried out for 6 hours at a temperature of 45°C and for 18 hours at a temperature of 20°C, until gas chromatography indicates complete conversion. The reaction mixture is then neutralised cautiously with 1 N HCI, a small amount of saturated aqueous sodium chloride is added and extraction with ethyl acetate is carried out a total of three times. The combined organic phases are dried over magnesium sulfate. After filtration and removal of the ethyl acetate by evaporation, 5.0 g of 3,5-dichloro-2-(prop-2-ynyloxy)-pyridine are obtained in the form of a pale yellow oil, which corresponds to a quantitative conversion. Example P2: Preparation of (3-l ' 3-(3.5-dichloropyridin-2-yloxy)-prop-1 -ynyll-phenyll- acetonitrile: 486 mg (2.0 mmol) of 3-iodo-1 -phenylacetonitrile, 17.1 mg (0.09 mmol) of Cul and 126 mg (0.18 mmol) of Pd(PPh 3 ) 2 CI 2 are dissolved at 20°C in 10 ml of THF under argon. After 15 minutes' stirring, 0.56 ml (4.0 mmol) of triethylamine is added. A solution of 444 mg (2.2 mmol) of 3,5-dichloro-2-(prop-2-ynyloxy)-pyridine (Example P1 ) in 3 ml of THF is then added dropwise over a period of 30 minutes. After a further 16 hours' stirring at 20°C, the THF is distilled off, 50 ml of water are added to the residue, and extraction is carried out with a total of about 120 ml of ethyl acetate. After separation of the organic phase, drying over magnesium sulfate and filtration, concentration by evaporation is carried out. The dark residue is purified by chromatography (eluant: ethyl acetate/hexane 1/4). 300 mg of {3-[3- (3,5-dichloropyridin-2-yloxy)-prop-1 -ynyl]-phenyl}-acetonitrile are obtained in solid form having a melting point of from 70 to 72°C. Example P3: Preparation of 5-bromo-2-(prop-2-vnyloxy)-pyridine: 0.54 g (0.011 mol) of NaH (55 %) is suspended in 15 ml of absolute THF under nitrogen. 0.67 ml (0.011 mol) of propargyl alcohol is then added dropwise over a period of about 5 minutes at a temperature of 0°C. When the addition is complete, the ice-cooling is removed and stirring is carried out for 30 minutes at a temperature of about 20°C until the evolution of gas has ceased. 2.0 g (0.011 mol) of 5-bromo-2-fluoropyridine dissolved in 5 ml of THF are then added dropwise at 20-30°C, with stirring and ice-cooling. Stirring is then carried out for a further 2 hours at room temperature until gas chromatography indicates complete conversion. The reaction mixture is then cautiously poured into 40 ml of water and extraction with ethyl acetate is carried out a total of three times. The combined organic phases are dried over sodium sulfate. After filtration and removal of the ethyl acetate by evaporation, 2.1 g of 5-bromo-2-(prop-2-ynyloxy)-pyridine are obtained in the form of beige crystals having a melting point of 58-60°C. Example P4: Preparation of 5-chloro-3-fluoro-2-(prop-2-vnyloxy)-pyridine: 8.0 g (0.167 mol) of NaH (55 %) are suspended in 200 ml of absolute THF under nitrogen. 9.9 ml (0.167 mol) of propargyl alcohol dissolved in 10 ml of absolute THF are then added dropwise over a period of about 10 minutes at a temperature of 0°C. When the addition is complete, the ice-cooling is removed and stirring is carried out at room temperature for 45 minutes until the evolution of gas has ceased. 25 g (0.167 mol) of 5-chloro-2,5- difluoropyridine dissolved in 50 ml of THF are then added dropwise at 20-30°C, with stirring and ice-cooling. Stirring is carried out for a further 3 hours at room temperature until gas chromatography indicates complete conversion. The reaction mixture is then cautiously poured into 250 ml of water and extraction with ethyl acetate is carried out a total of three times. After separation of the organic phase, drying over sodium sulfate and filtration, concentration by evaporation is carried out. The yellow residue is purified by chromatography (eluant: ethyl acetate/hexane 1/4). 19.1 g of 5-chloro-3-fluoro-2-(prop-2-ynyloxy)- pyridine are obtained in the form of a colourless oil. Example P5: Preparation of 5-chloro-3-methoxy-2-(prop-2-vnyloxy)-pyridine: 1.0 g (5.4 mmol) of 5-chIoro-3-fluoro-2-(prop-2-ynyloxy)-pyridine (Example P4) are placed in 15 ml of methanol under nitrogen. 2.0 ml (10.8 mmol) of a 30 % sodium methanolate solution in methanol are then added dropwise over a period of about 5 minutes at room temperature. When the addition is complete, the reaction mixture is heated to reflux and stirred at that temperature for a further 18 hours. The reaction mixture is cooled to room temperature and 30 ml of water are then added cautiously. Extraction with ethyl acetate is then carried out three times. After separation of the organic phase, drying over sodium sulfate and filtration, concentration by evaporation is carried out. The yellowish residue is purified by chromatography (eluant: ethyl acetate/hexane 1/4). 0.65 g of 5-chloro-3-methoxy- 2-(prop-2-ynyloxy)-pyridine is obtained in the form of colourless crystals having a melting point of 62-64°C. Example P6: Preparation of (3-f3-(5-bromopyridin-2-yloxy)-prop-1-vnyl1-phenyl)-acetonitrile: 486 mg (2.0 mmol) of 3-iodo-1-phenylacetonitrile, 424 mg (2.0 mmol) of 5-bromo-2-(prop-2- ynyloxy)-pyridine (Example P3) and 80 mg (0.11 mmol) of Pd(PPh 3 ) 2 CI 2 are dissolved at a temperature of 0°C in a mixture of 10 ml of chloroform and 4 ml of triethylamine under argon. After 15 minutes' stirring, 36 mg (0.19 mmol) of Cul are added. After a further 18 hours' stirring at a temperature of 0°C, the reaction mixture is filtered through a small amount of silica gel. The filtrate is concentrated by evaporation and the dark residue is purified by chromatography (eluant: ethyl acetate/hexane 1/4). 180 mg of {3-[3-(5-bromo- pyridin-2-yloxy)-prop-1 -ynyl]-phenyl}-acetonitrile are obtained in solid form having a melting point of 121 -123°C. Example P7: Preparation of 5-chloro-2-[3-(4-chlorophenyl)-prop-2-vnyloxyl-3-methoxy- pyridine: 112 mg (0.47 mmol) of 1 -iodo-4-chlorobenzene, 94 mg (0.47 mmol) of 5-chloro-3-methoxy- 2-(prop-2-ynyloxy)-pyridine (Example P5) and 34 mg (0.047 mmol) of Pd(PPh 3 ) 2 CI 2 are dissolved at a temperature of -78°C in a mixture of 5 ml of methanol and 0.335 ml (2.4 mmol) of triethylamine under argon. After 15 minutes' stirring, 27 mg (0.14 mmol) of Cul are added. The reaction mixture is left for 18 hours, with stirring, to warm to room temperature and is then filtered through a small amount of silica gel. The filtrate is concentrated by evaporation and the dark residue is purified by chromatography (eluant: ethyl acetate/hexane 1/4). 37 mg of 5-chloro-2-[3-(4-chlorophenyl)-prop-2-ynyloxy]-3- methoxypyridine are obtained in solid form having a melting point of 109-110°C. Table 1 : Compounds of formula Comp. Ri R 2 R 3 R 4 Phys. data No. m.p. (°C) 1.001 H 3-CI H H - 1.002 H 3-CH 2 CN H H oil 1.003 H 3-CH 2 CN CH 3 H - 1.004 H 3-CN H H - 1.005 3-F 3-CH 2 CN H H - 1.006 3-C1 3-CH 2 CN H H - 1.007 5-CI 3-CH 2 CN H H 110-112 1.008 5-Br 3-CH 2 CN H H 121 -123 1.009 3-F, 5-F 3-CH 2 CN H H - 1.010 3-CI, 5-CI 3-CH 2 CN H H 70-72 1.011 3-F, 5-CI 3-CH 2 CN H H 64-66 1.012 3-F, 5-CI 3-CH 2 CN CH 3 H - 1.013 3-F, 5-CI 3-CH 2 CN CH 3 CH 3 - 1.014 3-OCH 3 , 5-CF 3 3-CH 2 CN H H - 1.015 3-OCH 3 , 5-F 3-CH 2 CN H H - 1.016 3-OCH 3 , 5-CI 3-CH 2 CN H H 93-97 1.017 3-OCH 3 , 5-Br 3-CH 2 CN H H - 1.018 3-OCH 3 , 5-F 3-CH 2 CN CH3 H - 1.019 3-OCH 3 , 5-CI 3-CH 2 CN CH 3 H - 1.020 3-OCH 3 , 5-F 3-CH(CH 3 )CN H H - 1.021 3-OCH 3 , 5-CI 3-CH(CH 3 )CN H H - 1.022 3-OCh l , 5-CH 3 3-CH 2 CN H H - Comp. i R 2 R3 R 4 Phys. data No. m.p. (°C) 3.010 3-F 3-CH 2 CN H H - 3.011 3-CI 3-CH 2 CN H H - 3.012 3-Br 3-CH 2 CN H H - 3.013 2-CF 3 3-CH 2 CN H H oil 3.014 3-CF 3 3-CH 2 CN H H - 3.015 3-CF 2 CI 3-CH 2 CN H H - 3.016 3-F 3-CH(CH 3 )CN H H - 3.017 3-CI 3-CH(CH 3 )CN H H - 3.018 3-Br 3-CH(CH 3 )CN H H - 3.019 3-F CH(OCH 3 )CN H H - 3.020 3-CI CH(OCH 3 )CN H H - 3.021 3-Br CH(OCH 3 )CN H H - 3.022 3-F 3-OSO 2 CH 3 H H - 3.023 3-CI 3-OSO 2 CH 3 H H - 3.024 3-Br 3-OSO 2 CH 3 H H - 3.025 3-F CH(OCH 3 ) 2 H H - 3.026 3-CI CH(OCH 3 ) 2 H H - 3.027 3-Br CH(OCH 3 ) 2 H H - 3.028 2-F, 5-F 3-CH 2 CN H H - 3.029 2-CI, 5-F 3-CH 2 CN H H - 3.030 3-F 4-CI H H - 3.031 3-CI 4-CI H H - 3.032 3-Br 4-CI H H - 3.033 2-CH 3 , 5-F 3-CH 2 CN H H - 3.034 2-CH3, 5-CI 3-CH 2 CN H H - 3.035 2-CH3, 5-Br 3-CH 2 CN H H - 3.036 2-F 3-CI CH 3 H - 3.037 2-CI 3-CI CH 3 H - 3.038 2-Br 3-CI CH 3 H - 3.039 2-F 3-CH 2 CN CH 3 H - 3.040 2-CI 3-CH 2 CN CH 3 H - 3.041 2-Br 3-CH 2 CN CH 3 H . Monocotyledonous and dicotyledonous test plants are sown in standard soil in pots. Immediately after sowing, an aqueous suspension of the test compounds (prepared from a wettable powder (Example F3, b) according to WO 97/34485) or an emulsion of the test compounds (prepared from an emulsifiable concentrate (Example F1 , c) according to WO 97/34485) is applied by spraying at an optimum rate of application (500 litres of water/ha). The test plants are then cultivated in a greenhouse under optimum conditions. After a test duration of 4 weeks, the test is evaluated in accordance with a scale of nine ratings (1 = total damage, 9 = no action). Ratings of from 1 to 4 (especially from 1 to 3) indicate good to very good herbicidal action. Test plants: Setaria, Panicum, Digitaria, Amaranthus, Stellaria, Veronica. Table B1 : Rate of application : 1000 g a.i./ha The same results are obtained when the compounds of formula I are formulated according to the other Examples analogously to WO 97/34485. Example B2: Post-emergence herbicidal action Monocotyledonous and dicotyledonous test plants are sown in standard soil in pots, and at the 2- to 3-leaf stage are sprayed with an aqueous suspension of the test compounds (prepared from a wettable powder (Example F3, b) according to WO 97/34485) or with an emulsion of the test compounds (prepared from an emulsifiable concentrate (Example F1 , c) according to WO 97/34485) at an optimum rate of application of 500 litres of water/ha). The test plants are then grown on in the greenhouse under optimum conditions. After a test duration of 2 to 3 weeks, the test is evaluated in accordance with a scale of nine ratings (1 = total damage, 9 = no action). Ratings of from 1 to 4 (especially from 1 to 3) indicate good to very good herbicidal action. Test plants: Panicum, Euphorbia, Sida, Amaranthus, Chenopodium, Stellaria, Veronica. Table B2: Rate of application : 1000 g a.i./ha In the above Tables B1 and B2, " - " indicates that there are no data for the corresponding indication. The same results are obtained when the compounds of formula I are formulated according to the other Examples analogously to WO 97/34485.

Claims: What is claimed is: 1. A compound of formula wherein n is O, 1 , 2, 3 or 4; each Rn independently of any other(s) is halogen, -CN, -SCN, -SF 5 , -NO 2 , -NR 5 R 6 , -CO 2 R 7 , -CONR 8 R 9 , -C(R 10 )=NOR 11 , -COR 12 , -OR 13 , -SR 14> -SOR 15> -SO 2 R 16 , -OSO 2 R 17l C C 8 alkyl, C 2 -C 8 alkenyl, C 2 -C 8 alkynyl or C 3 -C 6 cycloalkyl; or CτC 8 alkyl, C 2 -C 8 alkenyl or C 2 -C 8 alkynyl substituted by one or more halogen, -CN, -NO 2 , -NR-ι 8 Rι 9 , -CO 2 R 20 , -CONR 21 R 22 , -COR 23 , -C(R 24 )=NOR 25 , -C(S)NR 26 R 27 , -C(C C 4 alkylthio)=NR 28 , -OR 29 , -SR 30 , -SOR 31 , -SO 2 R 32 or C 3 -C 6 cycloalkyl substituents; or each R 1 is C 3 -C 6 cycloalkyI substituted by one or more halogen, -CN, -NO 2 , -NR 18 R 19 , -CO 2 R 20 , -CONR 21 R 22 , -COR 23 , -C(R 24 )=NOR 2 5, -C(S)NR 26 R 27 , -C(C 1 -C 4 alkylthio)=NR 28 , -SR 30 , -SOR 31 . -SO 2 R 32 or C 3 -C 6 cycloalkyl substituents; or each R-i independently of any other(s) is phenyl, which may itself be substituted by one or more halogen, C C 4 alkyl, C C 4 haloalkyl, C C 4 alkoxy, -CN, -NO 2 , CrC 4 aIkylthio, C C 4 - alkylsulfinyl or C C 4 alkylsulfonyl substituents; or two adjacent R. together form a CrC 7 alkylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by CrC 6 aIkyl, the total number of ring atoms being at least 5 and a maximum of 9; or two adjacent R-i together form a C 2 -C 7 - alkenylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by Cι-C 6 alkyl, the total number of ring atoms being at least 5 and a maximum of 9; R 3 and R 4 are each independently of the other hydrogen, halogen, -CN, C C alkyl or Cι-C 4 - alkoxy; or R 3 and R 4 together denote C 2 -C 5 alkylene; R 5 is hydrogen or C C 8 alkyl; R 6 is hydrogen, Cι-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl; it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C C 4 alkyl, C C 4 - haloalkyl, CrC 4 alkoxy, -CN, -NO 2 , C C 4 alkylthio, C C 4 alkylsulfinyl or C C- 4 alkylsulfonyl substituents; or R 5 and R 6 together denote a C 2 -C 5 alkylene chain, which may be interrupted by an oxygen or sulfur atom; R 7 is hydrogen, CrC 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or C C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl substituted by one or more halogen, CrC 4 alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, CrC 4 alkyl, C C 4 - haloalkyl, CrC 4 alkoxy, -CN, -NO 2 , d-dalkylthio, C C 4 alkylsulfinyl or C C 4 alkylsulfonyl substituents; R 8 is hydrogen or Cι-C 8 alkyl; R 9 is hydrogen or d-C 8 alkyl, or d-C 8 alkyl substituted by one or more COOH, d-C 8 - alkoxycarbonyl or -CN substituents, or R g is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, Cι-C 4 alkyl, C C 4 haloalkyl, Cι-C 4 - alkoxy, -CN, -NO 2 , CrC 4 alkylthio, C C 4 alkylsulfinyl or C C alkylsulfonyl substituents; or R 8 and R 9 together denote C 2 -C 5 alkylene; R 10 is hydrogen, d-C 4 alkyl, C C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 11 is hydrogen, C*ι-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, CrC 4 haloalkyl or C 3 -C 6 haloalkenyl; R 12 is hydrogen, d-C alkyl, d-C haloalkyl or C 3 -C 6 cycloalkyl; R 13 is hydrogen, Cι-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl; or R 13 is phenyl or phenyl-d-C 6 alkyl, it being possible for the phenyl ring itself to be substituted by one or more halogen, d-C 4 alkyl, C C 4 haloalkyl, d-C 4 alkoxy, -CN, -N0 2 or -S(O) 2 CrC 8 alkyl substituents, or R 13 is CrC 8 alkyl substituted by one or more halogen, -CN or Cι-C 4 alkoxy substituents; R 1 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or C C 8 alkyl substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; R 1 5, R 1 6 and R 17 are each independently of the others d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 - alkynyl, or d-C 8 alkyl substituted by one or more halogen, -CN or C C 4 alkoxy substituents; R 18 is hydrogen or d-C 8 alkyl; R 19 is hydrogen, C-ι-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, C r C 4 haloalkyl, d-C 4 alkoxy, -CN, -NO 2 , C r C 4 alkylthio, C C 4 alkylsulfinyl or C C 4 alkyl- sulfonyl substituents; or R 18 and R-,9 together denote a C 2 -C 5 alkylene chain, which may be interrupted by an oxygen or sulfur atom; R 20 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C C 4 alkyl, d-dhaloalkyl. C C 4 alkoxy, -CN, -NO z , C r C 4 alkylthio, C r C 4 alkylsulfinyl or d-dalkyl- sulfonyl substituents; R 21 is hydrogen or d-C 8 alkyl; R 22 is hydrogen or CrC 8 alkyl, or d-C 8 alkyl substituted by one or more COOH, Cι-C 8 - alkoxycarbonyl or -CN substituents, or R 22 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 a!kyl, C C 4 haloalkyl, d-C 4 - alkoxy, -CN, -NO 2 , Cι-C alkylthio, C -C 4 alkylsulfinyl or d-C 4 alkylsulfonyl substituents; or R 2 ι and R 22 together denote C 2 -C 5 alkylene; R 23 is hydrogen, CrC 4 alkyl, CrC 4 haloalkyl or C 3 -C 6 cycloalkyl; R 24 is hydrogen, C C 4 alkyl, C C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 25 is hydrogen, C C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, d-C 4 haloalkyl or C 3 -C 6 haloalkenyl; R 26 is hydrogen or Cι-C 8 alkyl; R 27 is hydrogen or d-C 8 alkyl, or d-C 8 alkyl substituted by one or more COOH, d-C 8 - alkoxycarbonyl or -CN substituents, or R 27 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, Cι-C 4 haloalkyl, C C 4 - alkoxy, -CN, -NO 2 , C 1 -C 4 afkylthio, d-C 4 alkylsulfinyl or d-C 4 alkylsulfonyl substituents; or R 26 and R 27 together denote C 2 -C 5 alkylene; R 28 is hydrogen or d-C 8 alkyl; R 29 and R 30 are each independently of the other hydrogen, C Csalkyi, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or C Csalkyi substituted by one or more halogen, -CN or C C 4 alkoxy substituents; R 31 and R 32 are each independently of the other CrC 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or d-C 8 alky! substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; m is 0, 1 , 2, 3, 4 or 5; each R 2 independently of any other(s) is halogen, -CN, -SCN, -SF 5 , -NO 2 , -NR 36 R 37 , -CO 2 R 38 , -CONR 39 R 40 , -C(R 41 )=NOR 42 , -COR^, -OR^, -SR 45 , -SOR 46 , -SO 2 R 47) OSO 2 R 48 -N([CO] p R 4 g)COR5o, -N(OR 5 i)COR 52 , -N(R 53 )CO 2 R 5 or -N-phthalimide; R 36 is hydrogen or d-C 8 alkyl; and R 37 is hydrogen, CrC 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C C 4 alkyl, d-dhaloalkyl, d-C 4 alkoxy, -CN, -NO 2) C C 4 alkylthio, C C 4 alkylsulfinyl or C C 4 alkyl- sulfonyl substituents; or R 36 and R 37 together denote a C 2 -C 5 alkylene chain, which may be interrupted by an oxygen or sulfur atom; R 38 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or CrC 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl substituted by one or more halogen, d-C 4 alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, d-C 4 alkyl, C C 4 - haloalkyl, C C 4 alkoxy, -CN, -NO 2 , d-dalkylthio, C C 4 alkylsulfinyl or d-C 4 alkylsulfonyl substituents; R 39 is hydrogen or d-C 8 alkyl; R 40 is hydrogen or d-C 8 alkyl, or C C 8 alkyl substituted by one or more -COOH, d-C 8 - alkoxycarbonyl or -CN substituents, or R 0 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-dalkyl, d-C 4 haloalkyl, d-C - alkoxy, -CN, -NO 2 , d-C 4 alkylthio, CrC 4 alkylsulfinyl or d-C alkylsulfonyl substituents; or R 39 and R 40 together denote C 3 -C 5 alkylene; R ι is hydrogen, Cι-C alkyl, d-C haloalkyl or C 3 -C 6 cycloalkyl; R 2 is hydrogen, CrC 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, CrC 4 haloalkyl or C 3 -C 6 haloalkenyI; R 43 is hydrogen, d-C alkyl, C C 4 haloalkyl or C 3 -C 6 cycloalkyl; RM is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl; or R 44 is phenyl or phenyl-d-C 6 alkyl, it being possible for the phenyl ring itself to be substituted by one or more halogen, CrC alkyl, C C 4 haloalkyl, C C alkoxy, -CN, -NO 2 or -S(O) 2 d-C 8 alkyl substituents, or R 44 is d-C 8 alkyl substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; R 45 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or d-C 8 alkyI substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; R 46 , R 47 and R 8 are each independently of the others C C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 - alkynyl, or d-C 8 alkyl substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; p is 0 or 1 ; R 9 , R50, R51, R52, R53 and R 54 are each independently of the others hydrogen, CrC 8 alkyl, or phenyl, which may itself be substituted by one or more halogen, d-C 8 alkyl, d-C 4 haloalkyl, Crdalkoxy, -CN, -NO 2 , C C 8 alkylthio, C C 8 alkylsulfinyl or d-C 8 alkylsulfonyl substituents; or each R 2 independently of any other(s) is C C 8 alkyl, or C C 8 alkyl mono- or poly-substituted by halogen, -CN, -NO 2 , -NR 55 R 56 , -CO 2 R 57 , -CONR 58 R 59 , -COR 60) -C(R 61 )=NOR 62) -C(S)NR 6 3R 64 , -C(d-C 4 alkyithio)=NR 65 , -OR 66 , -SR 67 , -SOR 68) -SO 2 R 69 , -O(SO 2 )R 70 , -N(R 71 )CO 2 R 72 , -N(R 73 )COR 74 or by C 3 -C 6 cycloalkyl; or each R 2 independently of any other(s) is C 2 -C 8 alkenyl, or C 2 -C 8 alkenyl mono- or poly- substituted by -CN, -NO 2 , -CO 2 R 75 , -CONR 76 R 77 , -COR 78 , -C(R 79 )=NOR 80 , -C(S)NR 81 R 82 , -C(CrC 4 alkylthio)=NR 83 or by C 3 -C 6 cycloalkyl; or each R 2 independently of any other(s) is C 2 -C 8 alkynyl, or C 2 -C 8 alkynyl mono- or poly- substituted by halogen, -CN, -CO 2 R 84 , -CONR 85 R 86 , -COR 87 , -C(R 88 )=NOR 89 , -C(S)NR 90 R 91 , -C(CrC 4 alkylthio)=NR 92 or by C 3 -C 6 cycloalkyl; or each R 2 independently of any other(s) is C 3 -C 6 cycloalkyl, or C 3 -C 6 cycloalkyl mono- or poly- substituted by halogen, -CN, -CO 2 R 93 , -CONR 94 R 95) -COR 96 , -C(R 97 )=NOR 98 , -C(S)NR 99 R 100 or by -C(C C 4 alkylthio)=NR 10 ι; or two adjacent R 2 together form a C C 7 alkylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by d-C 6 alkyl, the total number of ring atoms being at least 5 and a maximum of 9; or two adjacent R 2 together form a C 2 -C 7 - alkenylene bridge, which may be interrupted by 1 or 2 non-adjacent oxygen atoms and may be substituted by CrC 6 alkyl, the total number of ring atoms being at least 5 and a maximum of 9; R 55 is hydrogen or d-C 8 alkyl; R 56 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, d-dhaloalkyl, d-C alkoxy, -CN, -NO 2 , C C 4 alkylthio, C C 4 alkylsulfinyl or C C 4 alkyl- sulfonyl substituents; or R 55 and R 56 together denote a C 2 -C 5 alkylene chain, which may be interrupted by an oxygen or sulfur atom; R 57 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, or CrC 8 alkyI, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl substituted by one or more halogen, d-C 4 alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, d-C 4 alkyl, d-C - haloalkyl, d-C 4 alkoxy, -CN, -NO 2 , C C 4 alkylthio, C C 4 alkylsulfinyI or C C alkylsulfonyl substituents; R 58 is hydrogen or d-C 8 alkyl; R 59 is hydrogen or C C 8 alkyl, or C C 8 alkyl substituted by one or more -COOH, d-C 8 - alkoxycarbonyl or -CN substituents; or R 59 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, d-C 4 haloalkyl. C C 4 - alkoxy, -CN, -NO 2 , C C 4 alkylthio, d-C 4 alkylsulfinyl or CrC 4 alkylsulfonyl substituents; or R 58 and R 5 g together denote C 2 -C 5 alkylene; R 60 is hydrogen, d-C 4 alkyl, d-C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 61 is hydrogen, d-C 4 alkyl, CrC haloalkyl or C 3 -C 6 cycloalkyl; R 62 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, C C 4 haloalkyl or C 3 -C 6 haloalkenyl; and R 63 is hydrogen or d-C 8 alkyl; R 6 is hydrogen or C C 8 alkyl, or CrC g alkyl substituted by one or more -COOH, C C 8 - alkoxycarbonyl or -CN substituents; or R 64 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, d-C 4 haloalkyl, d-C 4 - alkoxy, -CN, -NO 2 , d-C 4 alkylthio, CrC 4 alkylsulfinyl or d-C alkylsulfonyI substituents; or R 63 and R 64 together denote C 2 -C 5 alkylene; R 65 is hydrogen or d-C 8 alkyl; R 66 and R 67 are each independently of the other hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 - alkynyl, or d-C 8 alkyl substituted by one or more halogen, -CN or d-C 4 alkoxy substituents; R 68 , R 69 and R 70 are each independently of the others d-C 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 - alkynyl, or CrC 8 alkyl substituted by one or more halogen, -CN or d-C alkoxy substituents; R 71 and R 73 are each independently of the other hydrogen, d-C 8 alkyl or C C 8 alkoxy; R 72 is Cι-C 8 alkyl; R 74 is hydrogen or CrC 8 alkyl; R 75 is hydrogen, CrC 8 alkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, each of which may be mono- or poly-substituted by one or more halogen, d-C 4 alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, CrC 4 alkyl, d-C - haloalkyl, C C 4 alkoxy, -CN, -NO 2 , C C 4 alkylthio. C C 4 alkylsulfinyl or C C 4 alkylsulfonyl substituents; R 76 is hydrogen or d-C 8 alkyl; R 77 is hydrogen or d-C 8 alkyl, or d-C 8 alkyl substituted by one or more -COOH, C C 8 - alkoxycarbonyl or -CN substituents; or R 77 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C C 4 alkyl, d-C haloalkyl, C C 4 - alkoxy, -CN, -NO 2 , CrC 4 alkylthio, C C alkylsulfinyl or C C 4 alkylsulfonyl substituents; or R 76 and R 77 together denote C 2 -C 5 alkylene; R 78 and R 79 are each independently of the other hydrogen, d-C 4 alkyl, C C 4 haloalkyl or C 3 -C 6 cycloalkyl; R 80 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, C C 4 haloalkyl or C 3 -C 6 haloalkenyl; R 81 is hydrogen or CrC 8 alkyl; R 82 is hydrogen or CrC 8 alkyl, or d-C 8 alkyl substituted by one or more -COOH, d-C 8 - alkoxycarbonyl or -CN substituents; or R 82 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C r C 4 alkyl, d-C 4 haloalkyl, C r C 4 - alkoxy, -CN, -NO 2 , C C 4 alkylthio, C 1 -C 4 alkylsulfinyl or C C 4 alkylsulfonyl substituents; or R 81 and R 82 together denote d-dalkylene; R 83 is hydrogen or Cι-C 8 alkyl; R M is hydrogen, d-dalkyl, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, each of which may be mono- or poly-substituted by one or more halogen, d-C alkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, d-dalkyi, d-C - haloalkyl, CrC 4 alkoxy, -CN, -NO 2 , d-dalkylthio, C C alkylsulfinyl or d-dalkylsulfonyl substituents; R 85 is hydrogen or d-C 8 alkyl; R 86 is hydrogen or d-C 8 alkyl, or CrC 8 alkyl substituted by one or more -COOH, C C 8 - alkoxycarbonyl or -CN substituents; or R 86 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, C C 4 alkyl, d-C 4 haloalkyl, d-C - alkoxy, -CN, -NO 2 , CrC alkylthio, C C 4 alkylsulfinyl or C C alkylsulfonyl substituents; or R 85 and R 86 together denote C 2 -C 5 alkylene; R 87 is hydrogen, d-C 4 alkyl, d-C haloalkyl or C 3 -C 6 cycloalkyl; R 88 is hydrogen, d-C 4 alkyl, CrC 4 haloalkyl or C 3 -C 6 cycloalkyl; R 89 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, CrC 4 haloalkyl or C 3 -C 6 haloalkenyl; Rgo is hydrogen or C C 8 alkyl; R 9 is hydrogen or CrC 8 alkyl, or C C 8 alkyl substituted by one or more -COOH, C C 8 - alkoxycarbonyl or -CN substituents; or R 9 ι is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-dalkyl, d-C haloalkyl, d-C - alkoxy, -CN, -NO 2 , d-C alkylthio, C C 4 alkylsulfinyl or d-C 4 alkylsulfonyl substituents; or Rgo and R 91 together denote C 2 -C 5 alkylene; R 92 is hydrogen or CrC 8 alkyl; R 93 is hydrogen, CrC 8 alkyI, C 3 -C 8 alkenyl or C 3 -C 8 alkynyl, each of which may be mono- or poly-substituted by one or more halogen, d-dalkoxy or phenyl substituents, it being possible for phenyl itself to be substituted by one or more halogen, C C 4 alkyl, C r C 4 - haloalkyl, C C 4 alkoxy, -CN, -NO 2 , d-dalkylthio, C C 4 alkylsulfinyl or d-dalkylsulfonyl substituents; Rg 4 is hydrogen or C C 8 alkyl; R 95 is hydrogen or d-C 8 alkyl, or C C 8 alkyl substituted by one or more -COOH, d-C 8 - alkoxycarbonyl or -CN substituents; or R 95 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, Crdalkyl, d-C 4 haloalkyl, C C - alkoxy, -CN, -NO 2 , d-C 4 alkylthio, d-C 4 alkylsulfinyl or C C alkylsulfonyl substituents; or R 94 and R 95 together denote C 2 -C 5 alkylene; R 96 is hydrogen, d-dalkyl, CrC 4 haloalkyl or C 3 -C 6 cycloalkyl; R 97 is hydrogen, d-C 4 alkyl, d-C haloalkyl or C 3 -C 6 cycloalkyl; R 98 is hydrogen, d-C 8 alkyl, C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, CrC 4 haloalkyl or C 3 -C 6 haloalkenyl; R 99 is hydrogen or d-C 8 alkyl; R 10 o is hydrogen or d-C 8 alkyl, or CrC 8 alkyl substituted by one or more -COOH, d-C 8 - alkoxycarbonyl or -CN substituents; or R 100 is C 3 -C 8 alkenyl, C 3 -C 8 alkynyl, phenyl or benzyl, it being possible for phenyl and benzyl themselves to be substituted by one or more halogen, d-C 4 alkyl, d-C 4 haloalkyl, C C - alkoxy, -CN, -N0 2 , C C 4 alkylthio, d-C 4 alkylsulfinyl or d-C 4 alkylsulfonyl substituents; or R 9 gand R 10o together denote C 2 -C 5 alkylene; and R 10 ι is hydrogen or C C 8 alkyl, and an agrochemically acceptable salt or a stereoisomer or tautomer of a compound of formula I. 2. A process for the preparation of a compound of formula I according to claim 1 , wherein a compound of formula II wherein R, is as defined for formula I, is reacted in the presence of a base with a compound of formula III wherein R 3 and R 4 are as defined for formula I and X 1 is O-tosyl, chlorine, bromine or iodine, to form a compound of formula IV wherein R^ R 3 and R 4 are as defined for formula I, and that compound is then coupled, in the presence of a palladium catalyst, with a compound of formula V wherein R 2 is as defined for formula I and A is halogen or trifluoromethanesulfonate. 3. A herbicidal and plant-growth-inhibiting composition that comprises a herbicidally effective amount of a compound of formula I on an inert carrier. 4. A method of controlling undesired plant growth, which comprises applying a herbicidally effective amount of a compound of formula I or a composition comprising that compound to the plants or to the locus thereof. 5. A method of inhibiting plant growth, which comprises applying a herbicidally effective amount of a compound of formula I or a composition comprising that compound to the plants or to the locus thereof. 6. A compound according to claim 1 , wherein each R 1 independently of any other(s) is halogen, -CN, -NO 2 , -C(R 10 )=NOR 11 , -OR 13 , -SO 2 R 16 , -OSO 2 Rι. , ' CrC 8 alkyl or C 2 -C 8 alkenyl, or d-C 8 alkyl substituted by one or more halogen or -CN substituents; R 10 is hydrogen or d-C 4 alkyl; and Rn is d-C 8 alkyl. 7. A compound according to claim 1 , wherein each R 2 independently of any other(s) is halogen, -CN, -NO 2 , -NR 36 R 37 , -CO 2 R 38 , -C(R 41 )=NOR 42 , -OR 44 , -SO 2 R 47 , -OSO 2 R 48 , C r C 8 alkyl, or d-C 8 alkyl mono- or poly- substituted by halogen, -CN or by -CO 2 R 57 ; R 36 and R 37 are hydrogen; R 38 is hydrogen or Cι-C 8 alkyl; R 4 ι is hydrogen or C C 4 alkyl; and R 42 is C C 8 alkyl. 8. A compound according to claim 1 , wherein each R-i independently of any other(s) is halogen, -CN, -NO 2 , -C(Rι 0 )*=NOR 11 ) -OR 13 , -SO 2 Ri6, -OSO 2 Rι 7 , C C 8 alkyl or C 2 -C 8 alkenyl, or d-C 8 alkyl substituted by one or more -CN; R 10 is hydrogen or d-dalkyl; Rn is CrC 8 alkyl; each R 2 independently of any other(s) is halogen, -CN, -NO 2 , -NR 36 R 37 , -CO 2 R 38 , -C(R 41 )=NOR 42 , -OR^, -SO 2 R 47 , -OSO 2 R 48 or C C 8 alkyl, or d-C 8 alkyl mono- or poly- substituted by -CN or by -CO 2 Rs ; R 36 and R 37 are hydrogen; R 38 is hydrogen or d-C 8 alkyl; R 4 ι is hydrogen or d-C 4 alkyl; R 42 is CrC 8 alkyl; and R 3 and R 4 are each independently of the other hydrogen or d-C 4 alkyl. 9. A compound according to claim 1 , wherein R T is halogen, -CN, C C 8 alkyl substituted by -CN, or d-C 8 alkoxy. 10. A compound according to claim 1 , wherein R 2 is halogen, -CN, d-C 8 alkyl substituted by -CN, or d-C 8 alkoxy.

Inventors: CRAIG GERALD WAYNE, EBERLE MARTIN, HALL ROGER GRAHAM, RENOLD PETER, SCHAETZER JUERGEN, CRAIG, GERALD, WAYNE, EBERLE, MARTIN, HALL, ROGER, GRAHAM, RENOLD, PETER, SCHAETZER, JUERGEN
Applicants: CRAIG GERALD WAYNE, EBERLE MARTIN, HALL ROGER GRAHAM, RENOLD PETER, SCHAETZER JUERGEN, SYNGENTA PARTICIPATIONS AG, CRAIG, GERALD, WAYNE, EBERLE, MARTIN, HALL, ROGER, GRAHAM, RENOLD, PETER, SCHAETZER, JUERGEN
Application year: 2001
Main classification: A01N43
IPC codes: A01N43, C07D213