Herbicidal pyridine sulfonylureas

Abstract: Pyridine sulfonylureas of the formula: wherein W is O or S; R is H or CH₃; R₁ is H, halogen, CN, or a lower aliphatic substituent; R₂ is H, CN, OH, NH₂ or an organic substituent; R₃ is H, alkyl or haloalkyl; R₄ is H, F, Cl or CH₃; A is a mono- or bicyclic heterocyclic group, especially pyrimidin-2-yl or 1,3,5-triazin-2-yl; and their agriculturally suitable salts, exhibit potent herbicidal activity. Some may also be used as plant growth regulants. The compounds may be made e.g. by reacting an an appropriate pyridine sulfonamide with the appropriate phenyl carbamate or thiocarbamate of formula

Description: This invention relates to novel pyridine sulfonylurea herbicidal compounds, agriculturally suitable compositions thereof and a method of using them to control the growth of undesired vegetation. New compounds effective for controlling the growth of undesired vegetation are in constant demand. In the most common situation, such compounds are sought to selectively control the growth of weeds in useful crops such as cotton, rice, corn, wheat and soybeans, to name a few. Unchecked weed growth in such crops can cause significant losses, reducing profit to the farmer and increasing costs to the consumer. In other situations, herbicides are desired which will control all plant growth. Examples of areas in which complete control of all vegetation is desired are areas around railroad tracks and industrial storage areas. There are many. products commercially available for these purposes, but the search continues for products which are more effective, less costly and environmentally safe. The "sulfonylurea" herbicides are an extremely potent class of herbicides discovered within the last few years. A multitude of structural variations exist within this class of herbicides, but they generally consist of a sulfonylurea bridge, -SO₂NHCONH-, linking two aromatic or heteroaromatic rings. U.S. 4,579,583 and 4,690,707 disclose herbicidal pyridinesulfonylureas of the formula wherein XA is NR₆R₇; and R₆ and R₇ are independently H, C₁-C₄ alkyl, C₃-C₆ alkenyl, C₃-C₆ alkynyl, C₃-C₆ alkoxyalkyl, C₁-C₄ cyanoalkyl, or taken together form a 5- or 6-membered heterocyclic ring which may also contain O, S, SO or NR₈. U.S. 4,544,401 discloses herbicidal pyridine sulfonylureas of the formula wherein R₁ is NR₆R₇; and R₂ is H, Cl, Br or CH₃. EP-A-101,670 discloses a process for the preparation of herbicidal sulfonylureas of the formula wherein A is -C=N-; and R₁ is NH(C₁-C₄)alkyl or N(C₁-C₄ alkyl)₂. U.S. 4,518,776 discloses a process for the preparation of herbicidal sulfonylureas of the formula wherein A is -C=N-; and R₁ is NH₂, NH(C₁-C₄)alkyl or N(C₁-C₄ alkyl)₂. Still further herbicidal sulfonylureas are disclosed in EP-A-232,067 and EP-A-103,543. SUMMARY OF THE INVENTION This invention relates to novel agriculturally suitable herbicidal compounds of the Formula wherein W is O or S; R is H or CH₃; R₁ is H, F, Cl, Br, I, C₁-C₂ alkyl, C₁-C₂ haloalkyl, OCH₃, OCH₂CH₃, OCH₂CF₃, OCF₂H, SCH₃, SCF₂H, C₁-C₃ alkylsulfonyl or SO₂CF₂H; R₂ is H, C₁-C₄ alkyl, C₁-C₂ haloalkyl, CN, OH, C₁-C₂ alkoxy, NH₂, NHCH₃, N(CH₃)₂, C₁-C₂ alkyl substituted by CN, C₁-C₂ alkoxy or C₁-C₂ alkylthio, C₃-C₄ cycloalkyl, C₃-C₄ alkenyl, C₃-C₄ alkynyl or C(O)R₅; R₃ is H, C₁-C₄ alkyl or C₁-C₂ haloalkyl; or R₂ and R₃ may be taken together as -(CH₂) n - or -CH₂CH₂OCH₂CH₂- or R₄ is H, F, Cl or CH₃; R₅ is H, C₁-C₃ alkyl, C₁-C₂ alkoxy, NH₂, NHCH₃ or N(CH₃)₂; R₆ is H, C₁-C₂ alkyl or phenyl; R₇ is H or CH₃; n is 2, 3, 4 or 5; p is 0 or 1; X is H, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, C₁-C₄ haloalkyl, C₁-C₄ haloalkylthio, C₁-C₄ alkylthio, halogen, C₂-C₅ alkoxyalkyl, C₂-C₅ alkoxyalkoxy, amino, C₁-C₃ alkylamino or di(C₁-C₃ alkyl)amino; Y is H, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, C₁-C₄ haloalkylthio, C₁-C₄ alkylthio, C₂-C₅ alkoxyalkyl, C₂-C₅ alkoxyalkoxy, amino, C₁-C₃ alkylamino, di(C₁-C₃ alkyl)amino, C₃-C₄ alkenyloxy, C₃-C₄ alkynyloxy, C₂-C₅ alkylthioalkyl, C₂-C₅ alkylsulfinylalkyl, C₂-C₅ alkylsulfonylalkyl, C₁-C₄ haloalkyl, C₂-C₄ alkynyl, C₃-C₅ cycloalkyl, azido, cyano, or N(OCH₃)CH₃; m is 2 or 3; Q₁ and Q₂ are independently O or S; R a is H or C₁-C₃ alkyl; R b and R c are independently C₁-C₃ alkyl; Z is CH, N, CCH₃, CC₂H₅, CCl or CBr; Y₁ is O or CH₂; X₁ is CH₃, OCH₃, OC₂H₅ or OCF₂H; X₂ is CH₃, C₂H₅ or CH₂CF₃; Y₂ is OCH₃, OC₂H₅, SCH₃, SC₂H₅, CH₃ or CH₂CH₃; X₃ is CH₃ or OCH₃; Y₃ is H or CH₃; X₄ is CH₃, OCH₃, OC₂H₅, CH₂OCH₃ or Cl; and Y₄ is CH₃, OCH₃, OC₂H₅ or Cl; as well as compounds of Formula I wherein R and R₁ are H, R₂ is CH₂CH₂OH, R₃ is CH₃, R₄ is H, and A is A-1 wherein X, Y, Z are (i) OCH₃, OCH₃, CH; (ii) CH₃, OCH₃, CH; or (iii) CH₃, OCH₃, N respectively; and their agriculturally suitable salts; provided that 1) when X is halogen, then Z is CH and Y is OCH₃, OC₂H₅, NH₂, NHCH₃, N(CH₃)₂, OCF₂H, OCF₂Br or N(OCH₃)CH₃; 2) when X and/or Y is C₁ haloalkoxy, then Z is CH; 3) when W is S, then R is H, A is A-1, Z is CH or N, and Y is CH₃, OCH₃, OC₂H₅, CH₂OCH₃, C₂H₅, CF₃, SCH₃, OCH₂CH=CH₂, OCH₂C≡CH, OCH₂CH₂OCH₃, CH(OCH₃)₂ or 4) when the total number of carbon atoms of X and Y is greater than four, then the combined number of carbons of R₂ and R₃ is less than or equal to six; and 5) X₄ and Y₄ are not simultaneously Cl. In the above definitions, the term "alkyl," used either alone or in compound words such as "alkylthio" or "haloalkyl," denotes straight chain or branched alkyl, e.g., methyl, ethyl, n -propyl, isopropyl or the different butyl isomers. Alkoxy denotes methoxy, ethoxy, n -propoxy, iso-propoxy and the different butoxy isomers. Alkenyl denotes straight chain or branched alkenes, e.g., vinyl, 1-propenyl, 2-propenyl, 3-propenyl and the different butenyl isomers. Alkynyl denotes straight chain or branched alkynes, e.g., ethynyl, 1-propynyl, 2-propynyl and the different butynyl isomers. The term "halogen," either alone or in compound words such as "haloalkyl," denotes fluorine, chlorine, bromine or iodine. Further, when used in compound words such as "haloalkyl" said alkyl may be monohalogenated or fully substituted with halogen atoms, which may be the same or different. Examples of haloalkyl include CH₂CH₂F, CF₂CF₃ and CH₂CHFCl. The total number of carbon atoms in a substituent group is indicated by the C i -C j prefix where i and j are numbers from 1 to 4. For example, C₃-C₄ alkenyl would designate propenyl through butenyl. Compounds of the invention preferred for reasons of increased ease of synthesis and/or greater herbicidal efficacy are: 1. Compounds of Formula I wherein R₄ is H; 2. Compounds of Formula I or Preferred 1 wherein R₂ is C₁-C₂ haloalkyl, OH, C₁-C₂ alkoxy, NH₂, NHCH₃, N(CH₃)₂, C₁-C₂ alkyl substituted by C₁-C₂ alkylthio, C₃-C₄ cycloalkyl or C(O)R₅; R₃ is H, C₁-C₄ alkyl or C₁-C₂ haloalkyl; or R₂ and R₃ are taken together as -(CH₂) n -or and n is 2 or 3. 3. Compounds of Preferred 2 wherein W is O; X is C₁-C₂ alkyl, C₁-C₂ alkoxy, F, Cl, Br, I, OCF₂H, CH₂F, CF₃, OCH₂CH₂F, OCH₂CHF₂, OCH₂CF₃, CH₂Cl or CH₂Br; Y is H, C₁-C₂ alkyl, C₁-C₂ alkoxy, CH₂OCH₃, CH₂OCH₂CH₃, NHCH₃, N(OCH₃)CH₃, N(CH₃)₂, CF₃, SCH₃, OCH₂CH=CH₂, OCH₂C≡CH, OCH₂CH₂OCH₃, CH₂SCH₃, C(O)R a , OCF₂H, SCF₂H, OCF₂Br, cyclopropyl, C≡CH or C≡CCH₃; and Z is CH or N. 4. Compounds of Preferred 3 wherein R₂ is NH₂, NHCH₃, N(CH₃)₂, CF₃, CF₂H, OH, OCH₃, CH₂SCH₃, cyclopropyl or C(O)R₅; R₃ is H, CH₃ or CH₂CH₃; or R₂ and R₃ are taken together as -(CH₂) n - or R₅ is H, CH₃, OCH₃, NH₂, NHCH₃ or N(CH₃)₂; and R₆ is H or C₁-C₂ alkyl. 5. Compounds of Preferred 4 wherein A is A-1; X is CH₃, OCH₃, OCH₂CH₃, Cl, OCF₂H or OCH₂CF₃; and Y is CH₃, OCH₃, CH₂CH₃, CH₂OCH₃, NHCH₃ or CH(OCH₃)₂. 6. Compounds of Preferred 5 wherein R is H; R₁ is H; and p is O. 7. Compounds of Preferred 1 wherein R₂ is H, C₁-C₄ alkyl, CN, C₁-C₂ alkyl substituted by CN or C₁-C₂ alkoxy, C₃-C₄ alkenyl or C₃-C₄ alkynyl; R₃ is H, C₁-C₄ alkyl or C₁-C₂ haloalkyl; or R₂ and R₃ are taken together as -(CH₂) n - or -CH₂CH₂OCH₂CH₂-; and n is 4 or 5. 8. Compounds of Preferred 7 wherein W is O; X is C₁-C₂ alkyl, C₁-C₂ alkoxy, F, Cl, Br, I, OCF₂H, CH₂F, CF₃, OCH₂CH₂F, OCH₂CHF₂, OCH₂CF₃, CH₂Cl or CH₂Br; Y is H, C₁-C₂ alkyl, C₁-C₂ alkoxy, CH₂OCH₃, CH₂OCH₂CH₃, NHCH₃, N(OCH₃)CH₃, N(CH₃)₂, CF₃, SCH₃, OCH₂CH=CH₂, OCH₂C≡CH, OCH₂CH₂OCH₃, CH₂SCH₃, C(O)R a , OCF₂H, SCF₂H, OCF₂Br, cyclopropyl, C≡CH or C≡CCH₃; and Z is CH or N. 9. Compounds of Preferred 8 wherein R₂ is H, C₁-C₄ alkyl, CN, CH₂CN, CH₂OCH₃, allyl or propargyl; and R₃ is H, CH₃ or CH₂CH₃. 10. Compounds of Preferred 9 wherein A is A-1; X is CH₃, OCH₃, OCH₂CH₃, Cl, OCF₂H or OCH₂CF₃; and Y is CH₃, OCH₃, CH₂CH₃, CH₂OCH₃, NHCH₃ or CH(OCH₃)₂. 11. Compounds of Preferred 10 wherein R is H; R₁ is H; and p is O. 12. Compounds of Formula I wherein R₄ is F, Cl or CH₃. 13. Compounds of Preferred 12 wherein R₂ is C₁-C₂ haloalkyl, OH, C₁-C₂ alkoxy, NH₂, NHCH₃, N(CH₃)₂, C₁-C₂ alkyl substituted by C₁-C₂ alkylthio, C₃-C₄ cycloalkyl or C(O)R₅; R₃ is H, C₁-C₄ alkyl or C₁-C₂ haloalkyl; or R₂ and R₃ are taken together as -(CH₂)n-, or and n is 2 or 3. 14. Compounds of Preferred 13 wherein W is O; X is C₁-C₂ alkyl, C₁-C₂ alkoxy, F, Cl, Br, I, OCF₂H, CH₂F, CF₃, OCH₂CH₂F, OCH₂CHF₂, OCH₂CF₃, CH₂Cl or CH₂Br; Y is H, C₁-C₂ alkyl, C₁-C₂ alkoxy, CH₂OCH₃, CH₂OCH₂CH₃, NHCH₃, N(OCH₃)CH₃, N(CH₃)₂, CF₃, SCH₃, OCH₂CH=CH₂, OCH₂C≡CH, OCH₂CH₂OCH₃, CH₂SCH₃, C(O)R a , OCF₂H, SCF₂H, OCF₂Br, cyclopropyl, C≡CH or C≡CCH₃; and Z is CH or N. 15. Compounds of Preferred 14 wherein R₂ is NH₂, NHCH₃, N(CH₃)₂, CF₃, CF₂H, OH, OCH₃, CH₂SCH₃, cyclopropyl or C(O)R₅; R₃ is H, CH₃ or CH₂CH₃; or R₂ and R₃ are taken together as -(CH₂) n -, or R₅ is H, CH₃, OCH₃, NH₂, NHCH₃ or N(CH₃)₂; and R₆ is H or C₁-C₂ alkyl. 16. Compounds of Preferred 15 wherein A is A-1; X is CH₃, OCH₃, OCH₂CH₃, Cl, OCF₂H or OCH₂CF₃; and Y is CH₃, OCH₃, CH₂CH₃, CH₂OCH₃, NHCH₃ or CH(OCH₃)₂. 17. Compounds of Preferred 16 wherein R is H; R₁ is H; and p is O. 18. Compounds of Preferred 12 wherein R₂ is H, C₁-C₄ alkyl, CN, C₁-C₂ alkyl substituted by CN or C₁-C₂ alkoxy, C₃-C₄ alkenyl or C₃-C₄ alkynyl; R₃ is H, C₁-C₄ alkyl or C₁-C₂ haloalkyl; or R₂ and R₃ are taken together as -(CH₂) n - or -CH₂CH₂OCH₂CH₂-; and n is 4 or 5. 19. Compounds of Preferred 18 wherein W is O; X is C₁-C₂ alkyl, C₁-C₂ alkoxy, F, Cl, Br, I, OCF₂H, CH₂F, CF₃, OCH₂CH₂F, OCH₂CHF₂, OCH₂CF₃, CH₂Cl or CH₂Br; Y is H, C₁-C₂ alkyl, C₁-C₂ alkoxy, CH₂OCH₃, CH₂OCH₂CH₃, NHCH₃, N(OCH₃)CH₃, N(CH₃)₂, CF₃, SCH₃, OCH₂CH=CH₂, OCH₂C≡CH, OCH₂CH₂OCH₃, CH₂SCH₃, C(O)R a , OCF₂H, SCF₂H, OCF₂Br, cyclopropyl, C≡CH or C≡CCH₃; and Z is CH or N. 20. Compounds of Preferred 19 wherein R₂ is H, C₁-C₄ alkyl, CN, CH₂CN, CH₂OCH₃, allyl or propargyl; and R₃ is H, CH₃ or CH₂CH₃. 21. Compounds of Preferred 20 wherein A is A-1; X is CH₃, OCH₃, OCH₂CH₃, Cl, OCF₂H or OCH₂CF₃; and Y is CH₃, OCH₃, CH₂CH₃, CH₂OCH₃, NHCH₃ or CH(OCH₃)₂. 22. Compounds of Preferred 21 wherein R is H; R₁ is H; and p is O. Compounds of the invention specifically preferred for reasons of greatest ease of synthesis and/or greatest herbicidal efficacy are N-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-6-(dimethylamino)-2-pyridinesulfonamide, m.p. 141-143°C; 6-(dimethylamino)-N-[[[4-ethoxy-6-(methylamino)-1,3,5-triazin-2-yl]amino]carbonyl]-2-pyridinesulfonamide, m.p. 186-188°C; and N-[[[(4-ethoxy-6-(dimethylamino)-1,3,5-triazin-2-yl]amino]carbonyl]-6-(methylamino)-2-pyridinesulfonamide, m.p. 116-117°C. This invention also comprises intermediates of Formula II utilized in the preparation of the compounds of Formula I. wherein R₁, R₂, R₃, R₄ and p are as previously defined; and X₅ is Cl, NH₂ or NHC(CH₃)₃; provided that when R₁ is H, R₃ is H, R₄ is H, p is O and X₅ is NH₂, then R₂ is other than H. The compounds of this invention are highly active as preemergent and/or postemergent herbicides or plant growth regulants. Some of the compounds demonstrate selective safety toward cereal crops, maize (corn), cotton and oilseed rape. The invention comprises in addition to the novel compounds agriculturally suitable compositions containing said novel compounds and a method of using said compounds and/or compositions as preemergent and/or postemergent herbicides or plant growth regulants. More specifically, the invention includes a method for controlling the growth of undesired vegetation which comprises applying to the locus to be protected an effective amount of a compound of Formula I. For plant growth regulant use, there is applied to the locus of such plants an effective but substantially non-phytotoxic amount of a plant growth regulant selected from compounds of Formula I. DETAILED DESCRIPTION OF THE INVENTION Compounds of Formula I can be prepared by the methods described in Equations 1 and 2. Reagents and reaction conditions are given by way of illustration only. The reaction shown in Equation 1 is carried out by contacting a phenyl carbamate or phenyl thiocarbamate of Formula (2) with an aminoheterocycle of Formula (3) in an inert organic solvent such as dioxane or tetrahydrofuran at temperatures of about 20°C to 100°C for a period of about one-half to twenty-four hours. The product can be isolated by evaporation of the reaction solvent and purified by triturating the residue with solvents such as 1-chlorobutane or ethyl ether and filtering, by recrystallizing from mixtures of solvents such as 1,2-dichloroethane, 1-chlorobutane and heptane or by chromatography on silica gel. The reaction of Equation 2 can be carried out by contacting a sulfonamide of Formula (4) with a heterocyclic phenyl carbamate of Formula (5) in the presence of 1,8-diazabicyclo[5,4,0]undec-7-ene (DBU), by methods analogous to those described in South African Patent Application 830441. The phenyl carbamates of Formula (5) can be prepared by methods (or modifications thereof) described in South African Patent Application 825671 and South African Patent Application 825045. Phenylcarbamates and phenylthiocarbamates of Formula (2) (Equation 1) can be prepared from sulfonamides of Formula (4) (Equation 2) by methods described (or modifications thereof) in U.S. Patent 4,443,243. The sulfonamides (4) can be prepared via the routes shown in Equations 3-7, or by modifications thereof; for example, the reaction of step (e) could be performed on intermediate (9) and the product treated under acidic conditions to obtain (4). wherein: X is F or Cl, and L is a leaving group such as Cl, Br, I, alkyl sulfide, etc.; and with the provision that when R₁=H, then Step (3c) is omitted. Dihalopyridine (6) (The Chemistry of Heterocyclic Compounds, Vol. 14, Wiley-Interscience, New York (1964)) is contacted with benzyl mercaptan in the presence of potassium tert -butoxide in a solvent such as dimethylformamide to produce the sulfide (7). The product is isolated by partitioning the reaction mixture between water and ether (Equation 3a). The sulfide (7) is converted to tert -butyl sulfonamide (8) by treatment with hypochlorite solution followed by tert -butylamine using the methods described in South African Patent Application 848845 (Equation 3b). Metallation of compound (8) by treatment with two equivalents of a strong base such as n -butyllithium or lithium diisopropylamide (LDA) followed by treatment with an appropriate electrophile (R₁-L) Produces compound (9). An appropriate choice of electrophile R₁-L would be evident to one skilled in the art (Equation 3c). Contacting tert -butylsulfonamide (9) with trifluoroacetic acid affords sulfonamide (10). The product may be isolated by evaporation of the volatiles followed by trituration of the residue with an organic solvent such as ether (Equation 3d). Treatment of (10) with at least two equivalents of ammonia or of a primary or secondary amine or with the anion of a primary or secondary amide or of a cyanamide produces sulfonamide (4) (p=0). The product may be isolated by evaporating the volatiles in vacuo and triturating the residue with water or by partitioning the mixture between water and an organic solvent (Equation 3e). wherein: X and X₁ may be independently F, Cl or Br. The dihalopyridine (11) ( The Chemistry of Heterocyclic Compounds , Vol. 14, Wiley-Interscience, New York (1964)) is contacted with benzyl alcohol in the presence of an acid acceptor such as potassium carbonate in an inert solvent such as dimethyl sulfoxide to produce the ether (12). The product is isolated by partitioning the reaction mixture between water and ether (Equation 4a). The compound (12) is converted to sulfide (13) as described previously for Equation 3a (Equation 4b). Treatment of (13) with concentrated hydrochloric acid produces the pyridinol (14). The product is isolated by partitioning the reaction mixture between water and an organic solvent (Equation 4c). The pyridinol (14) is converted to chloride (15) by refluxing with thionyl chloride in the presence of dimethylformamide (DMF). The product is isolated by evaporation of the volatiles in vacuo and partitioning the residue between water and an organic solvent (Equation 4d). The chloride (15) is converted to sulfonamide (9) (X=Cl) as described previously for Equation 3b (Equation 4e). wherein: X is F, Cl or Br. The hydroxypyridine (16) ( The Chemistry of Heterocyclic Compounds , Vol. 14, Wiley-Interscience, New York (1964)) is converted to mercaptopyridine (17) by treatment with phosphorous pentasulfide or via the thiocarbamate according to the procedure of Newman, et al. in J . Org . Chem . 31 3980 (1966) (Equation 5a). Mercaptopyridine (17) is converted to sulfonamide (9) as described previously for Equation 3b (Equation 5b). wherein: X is F, Cl or Br. Sulfonamide (9) may be converted to the N-oxide (18) by methods such as those described (or modifications thereof) in Evans, et al., Rec . Trav . 78 408 (1959). Some of the oxidants of choice for this transformation are m -chloroperoxybenzoic acid, peracetic acid, etc. (Equation 6a). Compound (18) may be converted to sulfonamide (19) as described previously for Equation 3d (Equation 6b). Sulfonamide (19) may be converted to sulfonamide (4) (p=1) as described previously for Equation 3e (Equation 6c). wherein: X is F or Cl, and L is as previously defined. In cases where the substituent R₁ is sensitive to oxidation, this substituent may be introduced subsequent to the N-oxidation reaction. Thus, the sulfonamide (8) is converted to the N-oxide (20) by methods described for Equation 6a (Equation 7a). The N-oxide (20) is metallated and reacted with an electrophile (R₁-L) to produce sulfonamide (18) as described previously for Equation 3c (Equation 7b). For further details pertaining to lithiations of pyridine ring systems see, Epsztajn et al., Tetrahedron Lett ., 4739 (1980); Snieckus et al., J . Am . Chem . Soc ., 102 , 1457 (1980); Kuraishi et al., Tet . Lett ., 2049 (1983); Meyers et al., J . Org . Chem ., 47 , 2633 (1982); Taylor et al., J . Org . Chem ., 48 , 4156 (1983) and Breant et al., Synthesis , 822 (1983). For a general treatment of pyridines and pyridine N-oxides see, Katritzky, A. R., and Rees, C.\W., "Comprehensive Heterocyclic Chemistry", Vol. 2, Pergamon Press, Oxford, New York, Part 2A, 1984. Phenyl carbamates and phenyl thiocarbamates (5) of Equation 2 can be prepared from heterocyclic amines (3) by methods, or modifications thereof known to those skilled in the art, described in South African Patent Application 82/5671 and South African Patent Application 82/5045. The synthesis of heterocyclic amines such as those represented by Formula 3 (Equation 1) has been reviewed in "The Chemistry of Heterocyclic Compounds," a series Published by Interscience Publ., New York and London. Aminopyrimidines are described by D. J. Brown in "The Pyrimidines," Vol. XVI of the series mentioned above which is herein incorporated by reference. The 2-amino-1,3,5-triazines of Formula 3, where A is A-1 and Z is N, can be prepared according to the methods described by E. M. Smolin and L. Rapaport in " s -Triazines and Derivatives," Vol. XIII. Pyrimidines of Formula 3, where A is A-1 and Y is an acetal or thioacetal substituent, can be prepared by methods taught in European Patent Application No. 84,224 (published July 27, 1983). Pyrimidines of Formula 3, where A is A-1 and Y is cyclopropyl or OCF₂H can be synthesized according to the methods taught in United States Patent 4,515,626 and United States Patent 4,540,782, respectively. Compounds of Formula 3, where A is A-2 or A-3, can be prepared by procedures disclosed in United states Patent 4,339,267. Compounds of Formula 3, where A is A-4, can be prepared by methods taught in United States Patent 4,487,626. Additional references dealing with the synthesis of bicyclic pyrimidines of Formula 3, where A is A-2, A-3, or A-4 are Braker, Sheehan, Spitzmiller and Lott, J . Am . Chem . Soc ., 69 , 3072 (1947); Mitler and Bhattachanya, Quart . J . Indian Chem . Soc ., 4 , 152 (1927); Shrage and Hitchings, J . Org . Chem . Soc ., 16 , 1153 (1951); Caldwell, Kornfeld and Donnell, J . Am . Chem ., Soc ., 63 , 2188 (1941); and Fissekis, Myles and Brown, J . Org . Chem ., 29 , 2670 (1964). Compounds of Formula 3, where A is A-5, can be prepared by methods taught in United States Patent 4,421,550. Compounds of Formula 3, where A is A-6, can be prepared by methods taught in United States Patent 4,496,392. Compounds of Formula 3, where A is A-7, can be prepared by methods taught in EP-A-125,864. Agriculturally suitable salts of compounds of Formula I are also useful herbicides and can be Prepared by well-known methods including those described in United States Patent 4,127,405. The following Example illustrates the synthesis of the compounds of this invention. Temperatures are reported in degrees Celsius. Abbreviations for nuclear magnetic resonance (NMR) are s=singlet, d=doublet, dd=doublet of doublets, br=broad, and peak positions are reported as parts per million downfield from internal tetramethylsilane. The NMR spectra were measured at 200 MHz. Example 1 Step A N-(1,1-dimethylethyl)-6-fluoro-2-pyridinesulfonamide To 13.46 g (120 mmol) potassium tert -butoxide dissolved in 200 ml dry DMF was added dropwise 11.8 ml (12.5 g, 200 mmol) benzyl mercaptan while maintaining a temperature of 0°C to 5°C. This mixture was warmed to room temperature for 15 min, then cooled to -30°C, when 9.1 ml (11.5 g, 100 mmol) 2,6-difluoropyridine was added all at once. The reaction mixture was stirred 2 hr at 0°C, then at room temperature overnight. The mixture was then poured into 800 ml ice-water and extracted into 800 ml of ether. The ether layer was washed with three 200-ml portions of water, dried over magnesium sulfate, filtered and concentrated in vacuo to leave 21.97 g of a yellow oil. This crude sulfide was dissolved in 400 ml of methylene chloride, 200 ml of water was added and the mixture cooled to 0°C. Then 28.4 ml (341 mmol) of concentrated hydrochloric acid was added, followed by dropwise addition with vigorous stirring of 484 ml (341 mmol) of 5.25% sodium hypochlorite (Clorox®) while maintaining a temperature of 0°C to 5°C. After stirring another 20 min at 0°C, the mixture was separated and the organic phase was dried over magnesium sulfate, filtered and concentrated in vacuo , maintaining a temperature of no higher than 25°C. The residue was dissolved in 100 ml of methylene chloride and added dropwise to 25 ml (17.4 g, 238 mmol) tert -butylamine in 200 ml of methylene chloride, maintaining a temperature of 20°C to 25°C. The mixture was stirred 3 days at room temperature, then washed with 100 ml of water, dried over magnesium sulfate, filtered and concentrated in vacuo to leave a dark oil, which was triturated with hexanes to afford 15.90 g of olive-green solid, m.p. 88°C to 90°C. NMR (CDCl₃): δ 1.25 (s,9H), 4.96 (br s, 1H), 7.13 (dd, 1H), 7.95 (m, 1H), 8.02 (dd, 1H). Step B 6-Fluoropyridine-2-sulfonamide To 100 ml trifluoroacetic acid was added 11.6 g (50 mmol) of N-(1,1-dimethylethyl)-6-fluoro-2-pyridinesulfonamide and the mixture was refluxed for two days. The volatiles were then removed in vacuo and the residue triturated with ether to afford 7.23 g of tan solid, m.p. 110°C to 111°C. NMR (CDCl₃): δ 7.30 (d, 1H), 8.00 (d, 1H), 8.17 (dd, 1H). Step C 6-(Methylamino)pyridine-2-sulfonamide To 10 ml of condensed methylamine was added 1.86 g (10 mmol) of 6-fluoropyridine-2-sulfonamide. The mixture was allowed to reflux under a dry-ice condenser for 4 hr, then excess amine was allowed to evaporate overnight. The residue was crystallized with water to yield 1.64 g of tan solid, m.p. 124°C to 126°C. NMR (CDCl₃): δ 2.64 (s, 3H), 6.12 (br s, 2H), 6.30 (d, 1H), 6.86 (d, 1H), 7.23 (dd, 1H). Step D 2-[[(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl]aminosulfonyl]-6-(methylamino)pyridine To a suspension of 0.20 g (1.0 mmol) of 6-(methylamino)pyridine-2-sulfonamide and 0.28 g (1.0 mmol) of 4,6-dimethoxypyrimidin-2-yl phenyl carbamate in 1.0 ml of acetonitrile waa added 0.20 ml (0.20 g, 1.3 mmol) of 1,8-diazabicyclo[5,4,0]undec-7-ene. The mixture was stirred at room temperature for 1 hr, then 3 ml of water was added. Dropwise addition of 1 N hydrochloric acid precipitated a solid which was filtered and washed with water to afford 0.21 g of the title compound as a white powder, m.p. 166°C to 168°C. NMR(CDCl₃+CF₃CO₂D): δ 3.09 (s, 3H), 4.01 (s, 6H), 5.88 (s, 1H), 7.10 (d, 1H), 7.51 (d, 1H), 7.94 (dd, 1H). By applying the procedures of Example 1 and those described in Equations 1 through 7, the compounds in Tables I through IV can be prepared by one skilled in the art (melting points are in °C). Formulations Useful formulations of the compounds of Formula I can be prepared in conventional ways. They include dusts, granules, pellets, solutions, suspensions, emulsions, wettable powders, emulsifiable concentrates and the like. Many of these may be applied directly. Sprayable formulations can be extended in suitable media and used at spray volumes of from a few liters to several hundred liters per hectare. High strength compositions are primarily used as intermediates for further formulation. The formulations, broadly, contain about 0.1% to 99% by weight of active ingredient(s) and at least one of (a) about 0.1% to 20% surfactant(s) and (b) about 1% to 99.9% solid or liquid inert diluent(s). More specifically, they will contain these ingredients in the following approximate proportions: Lower or higher levels of active ingredient can, of course, be present depending on the intended use and the physical properties of the compound. Higher ratios of surfactant to active ingredient are sometimes desirable, and are achieved by incorporation into the formulation or by tank mixing. Typical solid diluents are described in Watkins, et al., "Handbook of Insecticide Dust Diluents and Carriers", 2nd Ed., Dorland Books, Caldwell, New Jersey, but other solids, either mined or manufactured, may be used. The more absorptive diluents are preferred for wettable powders and the denser ones for dusts. Typical liquid diluents and solvents are described in Marsden, "Solvents Guide," 2nd Ed., Interscience, New York, 1950. Solubility under 0.1% is preferred for suspension concentrates; solution concentrates are preferably stable against phase separation at 0°C. "McCutcheon's Detergents and Emulsifiers Annual", MC Publishing Corp., Ridgewood, New Jersey, as well as Sisely and Wood, "Encyclopedia of Surface Active Agents", Chemical Publishing Co., Inc., New York, 1964, list surfactants and recommended uses. All formulations can contain minor amounts of additives to reduce foaming, caking, corrosion, microbiological growth, etc. The methods of making such compositions are well known. Solutions are prepared by simply mixing the ingredients. Fine solid compositions are made by blending and, usually, grinding as in a hammer or fluid energy mill. Suspensions are prepared by wet milling (see, for example, Littler, U.S. Patent 3,060,084). Granules and Pellets may be made by spraying the active material upon preformed granular carriers or by agglomeration techniques. See J. E. Browning, "Agglomeration", Chemical Engineering , December 4, 1967, pp. 147ff. and "Perry's Chemical Engineer's Handbook", 5th Ed., McGraw-Hill, New York, 1973, pp. 8-57ff. For further information regarding the art of formulation, see for example: H. M. Loux, U.S. Patent 3,235,361, February 15, 1966, Col. 6, line 16 through Col. 7, line 19 and Examples 10 through 41; R. W. Luckenbaugh, U.S. Patent 3,309,192, March 14, 1967, Col. 5, line 43 through Col. 7, line 62 and Examples 8, 12, 15, 39, 41, 52, 53, 58, 132, 138-140, 162-164, 166, 167 and 169-182; H. Gysin and E. Knusli, U.S. Patent 2,891,855, June 23, 1959, Col. 3, line 66 through Col. 5, line 17 and Examples 1-4; G. C. Klingman, "Weed Control as a Science", John Wiley and Sons, Inc., New York, 1961, pp. 81-96; and J. D. Fryer and S. A. Evans, "Weed Control Handbook", 5th Ed., Blackwell Scientific Publications, Oxford, 1968, pp. 101-103. In the following Examples, all parts are by weight unless otherwise indicated. Example 2 Wettable Powder The ingredients are blended, hammer-milled until all the solids are essentially under 50 microns, reblended, and packaged. Example 3 Wettable Powder The ingredients are blended, coarsely hammer-milled and then air-milled to produce particles essentially all below 10 microns in diameter. The product is reblended before packaging. Example 4 Granule A slurry of wettable powder containing solids is sprayed on the surface of attapulgite granules in a double-cone blender. The granules are dried and packaged. Example 5 Extruded Pellet The ingredients are blended, hammer-milled and then moistened with about 12% water. The mixture is extruded as cylinders about 3 mm diameter which are cut to produce pellets about 3 mm long. These may be used directly after drying, or the dried pellets may be crushed to pass a U.S.S. No. 20 sieve (0.84 mm openings). The granules held on a U.S.S. No. 40 sieve (0.42 mm openings) may be packaged for use and the fines recycled. Example 6 Low Strength Granule The active ingredient is dissolved in a solvent and the solution is sprayed upon dedusted granules in a double-cone blender. After spraying of the solution has been completed, the material is warmed to evaporate the solvent. The material is allowed to cool and then packaged. Example 7 Granule The ingredients are blended and milled to pass through a 100 mesh screen. This material is then added to a fluid bed granulator, the air flow is adjusted to gently fluidize the material, and a fine spray of water is sprayed onto the fluidized material. The fluidization and spraying are continued until granules of the desired size range are made. The spraying is stopped, but fluidization is continued, optionally with heat, until the water content is reduced to the desired level, generally less than 1%. The material is then discharged, screened to the desired size range, generally 14 to 100 mesh (1410 to 149 microns), and packaged for use. Example 8 Low Strength Granule The active ingredient is dissolved in the solvent and the solution is sprayed upon dedusted granules in a double cone blender. After spraying of the solution has been completed, the blender is allowed to run for a short period and then the granules are packaged. Example 9 Aqueous Suspension The ingredients are blended and ground together in a sand mill to produce particles essentially all under 5 microns in size. Example 10 Solution The salt is added directly to the water with stirring to produce the solution, which may then be packaged for use. Example 11 High Strength Concentrate The ingredients are blended and ground in a hammer-mill to produce a material essentially all passing a U.S.S. No. 50 screen (0.3 mm opening). The concentrate may be formulated further if necessary. Example 12 Wettable Powder The ingredients are blended and ground in a hammer-mill to produce particles essentially all below 100 microns. The material is sifted through a U.S.S. No. 50 screen and then packaged. Example 13 Wettable Powder The ingredients are thoroughly blended, coarsely hammer-milled and then air-milled to produce particles essentially all below 10 microns in size. The material is reblended and then packaged. Example 14 Oil Suspension The ingredients are combined and ground together in a sand mill to produce particles essentially all below 5 microns. The product can be used directly, extended with oils, or emulsified in water. Example 15 Dust The active ingredient is blended with attapulgite and then passed through a hammer-mill to produce particles substantially all below 200 microns. The ground concentrate is then blended with powdered pyrophyllite until homogeneous. Example 16 Oil Suspension The ingredients are ground together in a sand mill until the solid particles have been reduced to under about 5 microns. The resulting thick suspension may be applied directly, but preferably after being extended with oils or emulsified in water. Example 17 Wettable Powder The ingredients are thoroughly blended. After grinding in a hammer-mill to produce particles essentially all below 100 microns, the material is reblended and sifted through a U.S.S. No. 50 sieve (0.3 mm opening) and packaged. Utility Test results indicate that the compounds of the present invention are highly active preemergent or postemergent herbicides or plant growth regulants. Many of them have utility for broad-spectrum pre-and/or post-emergence weed control in areas where complete control of all vegetation is desired, such as around storage tanks, parking lots, drive-in theaters, billboards, highways, and railroad structures. Some compounds have utility for selective weed control in cereal crops, such as wheat and barley, corn, cotton, rape, soybean and sugarbeet, and for weed control in fallow. Some of the compounds are particularly useful for the control of grass weeds, such as wild oat, in cereal crops, such as wheat and barley. Also, some of the compounds are particularly useful for the control of weeds in cotton and/or rape. Alternatively, the subject compounds are useful to modify plant growth. The rates of application for the compounds of the invention are determined by a number of factors, including their use as plant growth modifiers or as herbicides, the crop species involved, the types of weeds to be controlled, weather and climate, formulations selected, mode of application, amount of foliage present, etc. In general terms, the subject compounds should be applied at levels of around 0.0005 to 20 kg/ha, the lower rates being suggested for use on lighter soils and/or those having a low organic matter content, for plant growth modification or for situations where only short-term persistence is required such as herbicide for fallow land. The compounds of this invention may be used in combination with other commercial herbicides, insecticides or fungicides. The following list exemplifies some of the herbicides suitable for use in mixtures. Herbicidal properties of the subject compounds were discovered in a number of greenhouse tests. Test procedures and results follow. wherein Me denotes CH₃ and Et denotes CH₂CH₃. TEST A Seeds of barley ( Hordeum vulgare ), barnyardgrass ( Echinochloa crus-galli ), cheatgrass ( Bromus secalinus ) or downy brome ( Bromus tectorum ), cocklebur ( Xanthium pensylvanicum ), corn ( Zea mays ), cotton ( Gossypium hirsutum ), crabgrass ( Digitaria spp.), giant foxtail ( Setaria faberi ), morningglory ( Ipomoea spp.), rice ( Oryza sativa ), sorghum ( Sorghum bicolor ), soybean ( Glycine max ), sugarbeet ( Beta vulgaris ), velvetleaf ( Abutilon theophrasti ), wheat ( Triticum aestivum ), and wild oat ( Avena fatua ) and purple nutsedge ( Cyperus rotundus ) tubers were planted and treated preemergence with test chemicals dissolved in a non-phytotoxic solvent. At the same time, these crop and weed species were also treated with postemergence applications of test chemicals. Plants ranged in height from two to eighteen cm for postemergence treatments. Treated plants and controls were maintained in a greenhouse for sixteen days, after which all species were compared to controls and visually evaluated. The ratings, summarized in Table A, are based on a scale of 0 to 10 where 0 is no effect and 10 is complete control. A dash (-) response means no test. The accompanying descriptive symbols have the following meanings: C = chlorosis/necrosis; E = inhibition of emergence; G = growth retardation; H = formative effect; and U = unusual pigmentation. TEST B Seeds of barley ( Hordeum vulgare ), barnyardgrass ( Echinochloa crus-galli ), blackgrass ( Alopecurus myosuroides ), cheatgrass ( Bromus secalinus ) or downy brome ( Bromus tectorum ), chickweed ( Stellaria media ), cocklebur ( Xanthium pensylvanicum ), corn ( Zea mays ), cotton ( Gossypium hirsutum ), crabgrass ( Digitaria spp.) fiant foxtail ( Setaria faberi ), green foxtail ( Setaria viridis ), jimsonweed ( Datura stramonium ), johnsongrass ( Sorghum halepense ), lambsquarters ( Chenopodium album ), morningglory ( Ipomoea spp.), rape ( Brassica napus ), rice ( Oryza sativa ), sicklepod ( Cassia obtusifolia ), soybean ( Glycine max ), sugarbeet ( Beta vulgaris ), teaweed ( Sida spinosa ), velvetleaf ( Abutilon theophrasti ), wheat ( Triticum aestivum ), wild buckwheat ( Polygonum convolvulus ), and wild oat ( Avena fatua ) and purple nutsedge ( Cyperus rotundus ) tubers were planted and treated preemergence with test chemicals dissolved in a non-phytotoxic solvent. At the same time, these crop and weed species were also treated with postemergence applications of test chemicals. Plants ranged in height from two to eighteen cm for postemergence treatments. Treated plants and controls were maintained in a greenhouse for approximately 24 days, after which all species were compared to controls and visually evaluated. The ratings, summarized in Table B, are based on a scale of 0 to 100 where 0 is no effect and 100 is complete control. A dash (-) response means no test. TEST C Seeds of annual bluegrass ( Poa annua ), spring and winter barley ( Hordeum vulgare ), birdseye speedwell ( Veronica persica ), blackgrass ( Alopecurus myosuroides ), black nightshade ( Solanum nigrum ), catchweed bedstraw ( Galium aparine ), cheatgrass ( Bromus secalinus ), downy brome ( Bromus tectorum ), field pennycress ( Thlaspi arvense ), field violet ( Viola arvensis ), green foxtail ( Setaria viridis ), Italian ryegrass ( Lolium multiflorum ), ivyleaf speedwell ( Veronica hederaefolia ), jointed goatgrass ( Aegilops cylindrica ), kochia ( Kochia scoparia ), lambsquarters ( Chenopodium album ), rape ( Brassica napus ), Russian thistle ( Salsola kali ), scentless chamomile ( Matricaria inodora ), sugarbeet ( Beta vulgaris ), spring and winter wheat ( Triticum aestivum ), wild buckwheat ( Polygonum convolvulus ), and wild oat ( Avena fatua ) were planted and treated preemergence with test chemicals dissolved in a non-phytotoxic solvent. At the same time, these crop and weed species were also treated with postemergence applications of test chemicals. Plants ranged in height from two to twenty-four cm for postemergence treatments. Blackgrass and wild oat were treated postemergence at two growth stages. Treated plants and controls were maintained in a greenhouse for approximately 21 days, after which all species were compared to controls and visually evaluated. The ratings, summarized in Table C, are based on a scale of 0 to 100 where 0 is no effect and 100 is complete control. A dash (-) response means no test. TEST D Seeds of annual bluegrass ( Poa annua ), barley ( Hordeum vulgare ), blackgrass ( Alopecurus myosuroides ), chickweed ( Stellaria media ), green foxtail ( Setaria viridis ), ladysthumb smartweed ( Polygonum persicaria ), lambsquarters ( Chenopodium album ), redroot pigweed ( Amaranthus retroflexus ), sugarbeet ( Beta vulgaris ), wild buckwheat ( Polygonum convolvulus ), wild mustard ( Brassica spp.), and wild oat ( Avena fatua ) were planted and treated preemergence with test chemicals dissolved in a non-phytotoxic solvent. At the same time, these crop and weed species were also treated with postemergence applications of test chemicals. Plants ranged in height from two to twenty cm for postemergence treatments. Treated plants and controls were maintained in a greenhouse for approximately 24 days, after which all species were compared to controls and visually evaluated. The ratings, summarized in Table D, are based on a scale of 0 to 100 where 0 is no effect and 100 is complete control. TEST E Seeds of barnyardgrass ( Echinochloa crus-galli ), bermudagrass ( cynodon dactylon ), broadleaf signalgrass ( Brachiaria platyphylla ), cocklebur ( Xanthium pensylvanicum ), cotton ( Gossypium hirsutum ), fall panicum ( Panicum dichotomiflorm ), goosegrass ( Eleusine indica ), groundcherry ( Physalis heterophylla ), ivyleaf morningglory ( Ipomoea hederacea ), johnsongrass ( Sorghum halepense ), ladysthumb smartweed ( Polygonum persicaria ), lambsquarters ( Chenopodium album ), large crabgrass ( Digitaria sanguinalis ), prickly sida ( Sida spinosa ), purslane ( Portulaca oleracea ), redroot pigweed ( Amaranthus retroflexus ), sicklepod ( Cassia obtusifolia ), and velvetlead ( Abutilon theophrasti ) and purple nutsedge ( Cyperus rotundus ) tubers were planted and treated preemergence with test chemicals dissolved in a non-phytotoxic solvent. At the same time, these crop and weed species were also treated with postemergence applications of test chemicals. Plants ranged in height from five to twelve cm for postemergence treatments. Treated plants and controls were maintained in a greenhouse for approximately 21 days, after which all species were compared to controls and visually evaluated. The ratings, summarized in Table E, are based on a scale of 0 to 100 where 0 is no effect and 100 is complete control. A dash (-) response means no test.

Claims: A compound of the formula wherein W is O or S; R is H or CH₃; R₁ is H, F, Cl, Br, I, C₁-C₂ alkyl, C₁-C₂ haloalkyl, OCH₃, OCH₂CH₃, OCH₂CF₃, OCF₂H, SCH₃, SCF₂H, C₁-C₃ alkylsulfonyl or SO₂CF₂H; R₂ is H, C₁-C₄ alkyl, C₁-C₂ haloalkyl, CN, OH, C₁-C₂ alkoxy, NH₂, NHCH₃, N(CH₃)₂, C₁-C₂ alkyl substituted by CN, C₁-C₂ alkoxy or C₁-C₂ alkylthio, C₃-C₄ cycloalkyl, C₃-C₄ alkenyl, C₃-C₄ alkynyl or C(O)R₅; R₃ is H, C₁-C₄ alkyl or C₁-C₂ haloalkyl; or R₂ and R₃ may be taken together as -(CH₂) n - or -CH₂CH₂OCH₂CH₂- or R₄ is H, F, Cl or CH₃; R₅ is H, C₁-C₃ alkyl, C₁-C₂ alkoxy, NH₂, NHCH₃ or N(CH₃)₂; R₆ is H, C₁-C₂ alkyl or phenyl; R₇ is H or CH₃; n is 2, 3, 4 or 5; p is 0 or 1; A is X is H, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, C₁-C₄ haloalkyl, C₁-C₄ haloalkylthio, C₁-C₄ alkylthio, halogen, C₂-C₅ alkoxyalkyl, C₂-C₅ alkoxyalkoxy, amino, C₁-C₃ alkylamino or di(C₁-C₃ alkyl) amino; Y is H, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, C₁-C₄ haloalkylthio, C₁-C₄ alkylthio, C₂-C₅ alkoxyalkyl, C₂-C₅ alkoxyalkoxy, amino, C₁-C₃ alkylamino, di(C₁-C₃ alkyl)amino, C₃-C₄ alkenyloxy, C₃-C₄ alkynyloxy, C₂-C₅ alkylthioalkyl, C₂-C₅ alkylsulfinylalkyl, C₂-C₅ alkylsulfonylalkyl, C₁-C₄ haloalkyl, C₂-C₄ alkynyl, C₃-C₅ cycloalkyl, azido, cyano, or N(OCH₃)CH₃; m is 2 or 3; Q₁ and Q₂ are independently O or S; R a is H or C₁-C₃ alkyl; R b and R c are independently C₁-C₃ alkyl; Z is CH, N, CCH₃, CC₂H₅, CCl or CBr; Y₁ is O or CH₂; X₁ is CH₃, OCH₃, OC₂H₅ or OCF₂H; X₂ is CH₃, C₂H₅ or CH₂CF₃; Y₂ is OCH₃, OC₂H₅, SCH₃, SC₂H₅, CH₃ or CH₂CH₃; X₃ is CH₃ or OCH₃; Y₃ is H or CH₃; X₄ is CH₃, OCH₃, OC₂H₅, CH₂OCH₃ or Cl; and Y₄ is CH₃, OCH₃, OC₂H₅ or Cl; as well as compounds of Formula I wherein R and R₁ are H, R₂ is CH₂CH₂OH, R₃ is CH₃, R₄ is H, and A is A-1 wherein X, Y, Z are (i) OCH₃, OCH₃, CH; (ii) CH₃, OCH₃, CH; or (iii) CH₃, OCH₃, N respectively; and their agriculturally suitable salts; provided that 1) when X is halogen, then Z is CH and Y is OCH₃, OC₂H₅, NH₂, NHCH₃, N(CH₃)₂, OCF₂H, OCF₂Br or N(OCH₃)CH₃; 2) when X and/or Y is C₁ haloalkoxy, then Z is CH; 3) when W is S, then R is H, A is A-1, Z is CH or N, and Y is CH₃, OCH₃, OC₂H₅, CH₂OCH₃, C₂H₅, CF₃, SCH₃, OCH₂CH=CH₂, OCH₂C≡CH, OCH₂CH₂OCH₃, CH(OCH₃)₂ or 4) when the total number of carbon atoms of X and Y is greater than four, then the combined number of carbons of R₂ and R₃ is less than or equal to six; and 5) X₄ and Y₄ are not simultaneously Cl. The compounds of Claim 1 wherein R₂ is C₁-C₂ haloalkyl, OH, C₁-C₂ alkoxy, NH₂, NHCH₃, N(CH₃)₂, C₁-C₂ alkyl substituted by C₁-C₂ alkylthio, C₃-C₄ cycloalkyl or C(O)R₅; R₃ is H, C₁-C₄ alkyl or C₁-C₂ haloalkyl; or R₂ and R₃ are taken together as -(CH₂) n -or and n is 2 or 3. The compounds of Claim 2 wherein W is O; X is C₁-C₂ alkyl, C₁-C₂ alkoxy, F, Cl, Br, I, OCF₂H, CH₂F, CF₃, OCH₂CH₂F, OCH₂CHF₂, OCH₂CF₃, CH₂Cl or CH₂Br; Y is H, C₁-C₂ alkyl, C₁-C₂ alkoxy, CH₂OCH₃, CH₂OCH₂CH₃, NHCH₃, N(OCH₃)CH₃, N(CH₃)₂ CF₃, SCH₃, OCH₂CH=CH₂, OCH₂C≡CH, OCH₂CH₂OCH₃, CH₂SCH₃, C(O)R a , OCF₂H, SCF₂H, OCF₂Br, cyclopropyl, C≡CH or C≡CCH₃; and Z is CH or N. The compounds of Claim 3 wherein R₂ is NH₂, NHCH₃, N(CH₃)₂, CF₃, CF₂H, OH, OCH₃, CH₂SCH₃, cyclopropyl or C(O)R₅; R₃ is H, CH₃ or CH₂CH₃; or R₂ and R₃ are taken together as -(CH₂) n - or R₅ is H, CH₃, OCH₃, NH₂, NHCH₃ or N(CH₃)₂; and R₆ is H or C₁-C₂ alkyl. The compounds of Claim 4 wherein A is A-1; X is CH₃, OCH₃, OCH₂CH₃, Cl, OCF₂H or OCH₂CF₃; and Y is CH₃, OCH₃, CH₂CH₃, CH₂OCH₃, NHCH₃ or CH(OCH₃)₂. The compounds of Claim 5 wherein R is H; R₁ is H; and p is O. The compounds of Claim 1 wherein R₂ is H, C₁-C₄ alkyl, CN, C₁-C₂ alkyl substituted by CN or C₁-C₂ alkoxy, C₃-C₄ alkenyl or C₃-C₄ alkynyl; R₃ is H, C₁-C₄ alkyl or C₁-C₂ haloalkyl; or R₂ and R₃ are taken together as -(CH₂) n - or -CH₂CH₂OCH₂CH₂-; and n is 4 or 5. The compounds of Claim 7 wherein W is O; X is C₁-C₂ alkyl, C₁-C₂ alkoxy, F, Cl, Br, I, OCF₂H, CH₂F, CF₃, OCH₂CH₂F, OCH₂CHF₂, OCH₂CF₃, CH₂Cl or CH₂Br; Y is H, C₁-C₂ alkyl, C₁-C₂ alkoxy, CH₂OCH₃, CH₂OCH₂CH₃, NHCH₃, N(OCH₃)CH₃, N(CH₃)₂, CF₃, SCH₃, OCH₂CH=CH₂, OCH₂C≡CH, OCH₂CH₂OCH₃, CH₂SCH₃, C(O)R a , OCF₂H, SCF₂H, OCF₂Br, cyclopropyl, C≡CH or C≡CCH₃; and Z is CH or N. The compounds of Claim 8 wherein R₂ is H, C₁-C₄ alkyl, CN, CH₂CN, CH₂OCH₃, allyl or propargyl; and R₃ is H, CH₃ or CH₂CH₃. The compounds of Claim 9 wherein A is A-1; X is CH₃, OCH₃, OCH₂CH₃, Cl, OCF₂H or OCH₂CF₃; and Y is CH₃, OCH₃, CH₂CH₃, CH₂OCH₃, NHCH₃ or CH(OCH₃)₂. The compounds of Claim 10 wherein R is H; R₁ is H; and p is O. The compound of Claim 1 which is N-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-6-(dimethylamino)-2-pyridinesulfonamide. The compound of Claim 1 which is 6-(dimethylamino)-N-[[[4-ethoxy-6-(methylamino)-1,3,5-triazin-2-yl]amino]carbonyl]-2-pyridinesulfonamide. The compound of Claim 1 which is N-[[[(4-ethoxy-6-(dimethylamino)-1,3,5-triazin-2-yl]amino]carbonyl]-6-(methylamino)-2-pyridinesulfonamide. A compound of the formula wherein R₁, R₂, R₃, R₄ and p are as defined in Claim 1; and X₅ is NH₂ or NHC(CH₃)₃; provided that when R₁ is H, R₃ is H, R₄ is H, p is O and X₅ is NH₂, then R₂ is other than H. An agriculturally suitable composition for controlling the growth of undesired vegetation comprising an effective amount of a compound as in any of Claims 1-14 and at least one of the following: surfactant, solid diluent or liquid diluent. A method for controlling the growth of undesired vegetation which comprises applying to the locus to be protected an effective amount of a compound as in any of Claims 1-14. A method for regulating the growth of plants which comprises applying to the locus of such plants an effective but substantially non-phytotoxic amount of a plant growth regulant selected from compounds of any of claims 1-14. A process for the preparation of a compound of claim 1, which comprises: (a) reacting a phenyl carbamate or phenyl thiocarbamate of Formula with an aminoheterocycle of formula or (b) reacting a sulfonamide of formula with a heterocyclic phenyl carbamate or thiocarbamate of formula

Inventors: TAYLOR ERIC DEGUYON, TAYLOR, ERIC DEGUYON
Applicants: DU PONT, E.I. DU PONT DE NEMOURS AND COMPANY
Application year: 1988
Main classification: C07D401
IPC codes: C07D491, A01N47, C07D213, C07D521