HERBICIDAL o-CARBOMETHOXYSULFONYLUREA

Abstract: The compound methyl 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulf onyl] benzoate has high herbicidal activity and is particularly useful for weed control in plantation crops.

Description: Title HERBICIDAL O-CARBOMETHOXYSULFO YLUREA Background of the Invention The compound methyl 2-[[[[(4-methoxy-6-methyl-> 1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]- benzoate has high herbicidal activity and a desirable spectrum of weed control for use in plantation crops„ The compound of interest is disclosed in U.S. Patent 4,383,113, for uses other than weed control in plantation crops. Summary of the Invention This invention pertains to the use of the compound of Formula I and its agriculturally suitable salts for broad spectrum weed control in plantation crops. I The compound is methyl 2-[H[(4-methoxy-6- methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]- sulfonyl]benzoate. Synthesis The title compound of Formula I (metsulfuron methyl) can be prepared according to the procedure disclosed in U.S. 4,383,113 as follows: Example 1 To an anhydrous suspension of 1.4 g of 2-amino- 4-methoxy-6-methyl-l,3,5-triazine in 25 ml of methylene chloride is added with stirring at ambient temperature and pressure 2.4 g of 2-methoxycarbonylbenzenesulfonyl- isocyanate. The mixture is thereafter stirred for 16 hours and filtered. The filtrate is evaporated to dry- ness, the residue is triturated with butyl chloride and the product removed by filtration. X0 15 20 25 30 35 Formulations Useful formulations of the compound 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 diluent(s). More specifically, they will con¬ tain these ingredients in the following approximate proportions: Weight Percent* Active Ingredient ilyen .s) Surfactan (s. Wettable Powders 20-90 0-74 1-10 Oil Suspensions, 3-50 40-95 0-15 Emulsions, Solutions, (including Emulsifi¬ able Concentrates) Compositions * Active ingredient plus at least one of a Surfactant or a Diluent equals 100 weight percent. 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 5 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 - jQ Jersey, but other solids, either mined or manufac¬ tured, 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., j c 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, 20 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, micro¬ biological growth, and the like. 25 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 30 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 Browning, "Agglomeration", Chemical Engineering. 35 December 4, 1967, pp. 147ff. and "Perry's Chemical Engineer's Handbook", 5th Ed., McGraw-Hill, New York, 1973, pages 8 to 57 and following. For further information regarding the art of 5 formulation, see for example: U.S. Patent 3,235,361, column 6, line 16 through column 7, line 19 and Exam¬ ples 10 through 41; U.S. Patent 3,309,192, column 5, line 43 through column 7, line 62 and Examples 8, 12, 15, 39, 41, 52, 53, 58, 132, 138 to 140, 162 to 164, T 0 166, 167 and 169 to 182; U.S. Patent 2,891,855, column 3, line 66 through column 5, line 17 and Examples 1 to 4; Klingman, "Weed Control as a Science", John Wiley and Sons, Inc., New York, 1961, pages 81 to 96; and Fryer et al., "Weed Control Handbook", 5th Ed., , 5 Blackwell Scientific Publications, Oxford, 1968, pages 101 to 103. In the following Examples, all parts are by weight unless otherwise indicated. Example 2 2 Q Wettable PQwfler Methyl 2-[[[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- amino]carbonyl]amino]sulfonyl]benzoate 50% sodium alkylnaphthalenesulfonate 2% low viscosity methyl cellulose 2% diatomaceous earth 46% 25 The ingredients are blended, coarsely hammer- milled and then air-milled to produce particles essen¬ tially all below 10 microns in diameter. The product is reblended before packaging. Sxamt 30 ranyle Wettable Powder of Example 2 5% attapulgite granules 95% (U.S.S. 20 to 40 mesh; 0.84 to 0.42 mm) 35 A slurry of wettable powder containing 25% solids is sprayed on the surface of attapulgite granules in a double-cone blender. The granules are dried and pack¬ aged. 5 Example 4 Extruded Pellet Methyl 2-[[[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- aminojcarbonyl]amino]sulfonyl]benzoate 25% anhydrous sodium sulfate 10% jø crude calcium ligninsulfonate 5% sodium alkylnaphthalenesulfonate 1% calcium/magnesium bentonite 59% The ingredients are blended, hammer-milled and then moistened with about 12% water. The mixture is U 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 2 (0.42 mm openings) -may be packaged for use and the fines recycled. Example 5 Low Strength Granule Methyl 2-[[[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- amino]carbonyl]amino]sulfonyl]benzoate 1% 25 N,N-dimethylformamide 9% attapulgite granules 90% (U.S.S. 20 to 40 sieve) The active ingredient is dissolved in the solvent and the solution is sprayed upon dedusted granules in 30 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. 35 Example 6 Agueous Suspension Methyl 2-[[[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- amino]carbonyl]amino]sulfonyl]benzoate 40% polyacrylic acid thickener 0.3% dodecylphenol polyethylene glycol ether 0.5% disodium phosphate 1% monosodium phosphate 0.5% polyvinyl alcohol 1.0% water 56.7% The ingredients are blended and ground together in a sand mill to produce particles essentially all under 5 microns in size. Example 7 Oil Suspension Methyl 2-[[[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- amino]carbonyl]amino]sulfonyl]benzoate 35% blend of polyalcohol carboxylic 6% esters and oil soluble petroleum sulfonates' xylene 59% 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 8 Granule Methyl 2-πC[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- amino]carbonyl]amino]sulfonyl]benzoate 80% wetting agent 1% crude ligninsulfonate salt (containing 10% 5 to 20% of the natural sugars) attapulgite clay 9% 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 fluidiza- tion 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 9 Hioh Strength Concentrate Methyl 2-[[[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- amino]carbonyl]amino]sulfonyl]benzoate 99% silica aerogel 0.5% synthetic amorphous silica 0.5% 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 10 Wettable Powder Methyl 2-π[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- amino]carbonyl]amino]sulfonyl]benzoate 90% dioctyl sodium sulfosuccinate 0.1% synthetic fine silica 9.9% 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 11 Wettable Powder Methyl.2-[[[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- amino]carbonyl]amino]sulfonyl]benzoate 20% sodium ligninsulfonate 20% montmorillonite clay 60% 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 12 Dust Methyl 2-[[[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- a ino]carbonyl3amino]sulfonyl]benzoate 10% attapulgite 10% Pyrophyllite 80% The active ingredient is blended with attapul¬ gite 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. The compound of this invention can be specially formulated with diluents and/or carriers and/or other pesticides for application to plantation crops. The following list exemplifies some of the herbicides suitable for use in mixtures. Common Name Chemical Name dalapon 2,2-dichloropropionic acid diuron 3-(3,4-dichlorophenyl)-l,l-dimethylurea DSMA disodium methanearsonate glufosinate 4-[hydroxy(methyl)phosphinoyl]-DL-homo- alanine and its agriculturally suit¬ able salts especially the ammonium salt Common Name Chemical Name glyphosate N-(phosphonomethyl)glycine and hβrbi- eidally acceptable salts especially the mono(isopropylammonium) and tri- xnethylsulfonium salts hexazinone 3-cyclohexyl-6-(dimethylamino)-l-methyl- l,3,5-triazine-2,4(lH,3H)dione MSMA monosodium me.thanearsonate paraquat 1,1'-dimethyl- ,4'-bipyridinium ion triclopyr 3,5,6- richloro-2-pyridyloxyacetic acid 2,4-D {2,4-dichlorophenoxy)acetic acid and its agriculturally suitable salts espec¬ ially the dimethyl ammonium salt 2,4-DB 4-(2,4-=dichloroρhenoxy)buty ic acid imazapyr- 2—(4-isopropyl-4-methyl-=5-oxo-2-imida- isopropyl- zolin~2-yl)nicotinie acid with iso¬ ammonium propyl amine (1:1) picloram 4-amino-3,5,6-trichloropicolinic acid Utility The compound employed in the method of the present invention is an active herbicide for selective broadleaf and grass weed control with safety to plantation crops such as coffee, cocoa, oil palm, rubber, banana, citrus and certain conifers. Compound I can be applied as a preemergence or postemergence treatment using techniques of banding, directed sprays or broadcast applications. In general, the compound of this invention is used at 0.5 to 500 g/ha with a preferred rate range of 1 to 250 g/ha rate. One skilled in the art can select the proper rates for a given situation. The compound of this invention may be used in combination with other pesticides. It is particularly useful in combination with broadleaf herbicides used in plantation crops including: triazine, triazole, uracil, urea, amide, carbamate, bipyridylium, phenoxys, sulfonylurea and imidazolinone types. The preferred mixture for use in plantation crops includes glyphosate and its agriculturally suitable salts. The herbicidal properties of the subject com¬ pound were discovered in field tests conducted as described below. Test A This test was conducted in the field with the postemergence spraying of circles around oil palm. The weed species, Calopogonium caerulium .A.. Mikania icrantha isl and Pagpglμm coniuoatum (C) ranged in height from 10-20 cm up to mature plants and were sprayed with Compound I or its mixtures with Compounds II and III, dissolved in a nonphytotoxic solvent containing a surfactant. The degree of weed control was visually rated 0 to 125 days after treatment. The control ratings are averages of the readings and are expressed on a scale of 0 to 100 where 0 ~~ no effect, 20 = minimal control and 100 = complete control. The results are summarized in Table A. Compound II - l,l , -dimethyl-4,4*-bipyridinium ion Compound III - mono(isopropylammonium)N-(phos- phonomethyl)glycine Table A Weed Control in Oil Palm Treatment Average Control Rating Compound (g/ha. & 1(10) + II (990) 99 1(10) 75 I(IΣ) + III (615) 91 1(20) + II (990) 100 1(20) + III (615) 97 Test B This test was conducted in the field with the postemergence spraying of strips in rubber. The weed species Borreria latifolia. Clidemia xta, Dicranopteris linearis.' Eupatorium odoratum. Euphorb a heterophylla. Imperata cylindriea, Lantana camara. Melastoma malaba hricum. Nephrolepis biserrata and Pennisetum pedicellatum ranged in height f om 10-20 cm up to mature plants and were sprayed with Compound I or its mixtures with Compounds II and III, dissolved in a nonphytotoxic solvent containing a surfactant. The degree of weed control was visually rated 0 to 125 days after treatment. The control ratings are averages of the readings and are expressed on a scale of 0 to 100 where 0 = no effect, 20 ~ ~ minimal control and 100 = complete control. The results are summarized in Tables B to K. Compound II - 1,1'-dimethy1-4,4'-bipyridinium ion Compound III - mono(isoproρylamraonium)N-(phos- phonomethyl)glycine Table H Weed Control in Rubber Treatment Average Control Rating Compound (g/ha) Lantana camara I (10) 93 I (20) 98 Table I Weed Control in Rubber Treatment Average Control Rating Compound (g/ha. Melastoma malabathricum I (10) 94 I (10) + II (990) 73 I (20) 97 I (20) + II (990) 81 I (40) 98 __£}_1_L__Z Weed Control in Rubber Treatment ftv rgg Control F ing Compound (g/ha. Nenhrolepis biserrata I (10) + II (445) 92 I (10) 48 I (20) + II (445) 92 I (20) 62

Claims: WHAT IS CLAIMED ISϊ 1. A method for controlling undesired weeds in plantation crops which comprises applying to the locus of the weeds a herbicidally effective amount of methyl 2-[[[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)amino]car¬ bonyl]amino]sulfonyl]benzoate. 2. A method according to Claim 1 wherein the plantation crop is coffee. 3. A method according to Claim 1 wherein the plantation crop is rubber or oil palm. 4. A method according to Claim 1 wherein the plantation crop is banana. 5. A method according to Claim 1 wherein the 5 locus to be protected is a conifer planting. 6. A method according to Claim 1 wherein mono- (isopropylammonium)N-(phosphonomethyl)glycine is included in admixture with methyl 2-[[ [(4-methoxy- 6- methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]- ø sulfonyl]benzoate.- 7. A composition formulated to control weeds in plantation crops comprising an effective amount of methyl 2-[[[[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)- amino]carbonyl]amino]sulfonyl]benzoate in combination with a carrier or diluent. 5 8. A composition according to Claim 7 containing, additionally, an effective amount of a complementary pesticide. 9. A composition according to Claim 8 wherein the complementary herbicide is mono(isoρroρylammonium)- 0 N-(phosphonomethyl)glycine. 5

Inventors: CHANG SIEW HOONG, CHANG, SIEW, HOONG
Applicants: DU PONT, E.I. DU PONT DE NEMOURS AND COMPANY
Application year: 1988
Main classification: A01N47
IPC codes: A01N47, A01N57