TRIAZINE DERIVATIVE, ITS PREPARATION AND USE

Abstract: This application discloses the compound 3-(2-chloropyri­ din-4-yl)-5-methyl-1-phenyl-1,3,5-triazin-2-one. This com­ pound is useful in increasing the size of grapes, as a cotton defoliant, and as a herbicide.

Description: IMPROVEMENTS IN OR RELATING TO TRIAZINES This invention relates to the novel compound, 3-(2-chloro-pyridin-4-yl) 5-methyl-l-phenyl-l,3,5-triazin-2-one. This compound of the invention may be obtained by reacting N-(2-chloro-4pyridinyl)-N'-phenylurea with formaldehyde and methylamine under the conditions of a Mannich reaction. Formaldehyde is conveniently employed in the form of an aqueous solution. The reaction is preferably effected in a solvent which is inert under the reaction conditions, e.g. methanol. A suitable reaction temperature is from 5"C to 40"C, e.g. room temperature. The compound of the invention may be recovered from the reaction mixture in which it is formed by working up by established procedures. The compound of the invention has useful plant growth regulating activities: when employed at appropriate rates it may be employed to increase the size of grapes, to defoliate cotton or to combat weeds. The term grapes as used herein means grapes from a vine of the Vitaceae family (Vitis generally) and includes, for example, Thompson Seedless, Perlette, Rebeir, Seedless Tokay and Iterlocken. The biological activity of the compound of the invention is illustrated by the following test. 1. On the grape varieties Thompson seedless and Perlette Grape bunches are dipped in test solutions comprising 10, 50 and 100 ppm of a.i. The test solutions are obtained by diluting a solution of 0.05 grams of a.i. in 5 ml of acetone with 495 ml of water and further dilution, with water, to the test concentration. A drop of surfactant is added to each dip solution. The bunches of grape vine were dipped into each solution. Adjacent vines were used for each treatment. The remaining fruit on the vines was left intact. Treatments were made when most of the bunches were in the two week post-bloom period. Post-treatment evaluations were made 34 days after treat ment. The size of the grape was determined on a scale of 1-5, where 1 = no increase and 5 = maximum increase. Similarly the phytotoxicity to the grape was determined on a scale of 1-5, where 0 = no phytotoxicity and 5 = dead berries, as follows: TABLE I Grape Property Rate of Application (ppm) 0 10 50 100 Thompson Size increase 0 2 3 4 Seedless Phytotoxicity O 1 3 3 Weight (grams) 1.5 2.1 2.9 2.2 Perlette Size increase 1 2.5 3 3 Phytotoxicity 0 0.5 1 2 Weight (grams) 2.1 3.0 3.2 2.8 2. Cotton defoliant test Cotton plants were grown in the greenhouse under high intensity illumina tion. At the seven true-leaf stage, the cotton plants were foliarly treated to run off with aqueous solutions of the test compound at concentrations of 50, 100 and 200 ppm. Data were recorded three weeks after application of the test compound. The value for each system is a score relative to a scale of 0-10. The data represent averages for 3 plants per treatment. The value for necrosis (N) indicates a relative proportion of leaf tissue which has died. Leaf abscission (D) is based on the leaves present at the time of application of the test compound, while regrowth is described by apical meristem damage (M) and growth from axillary buds (A). TABLE II Rate of application (ppm) N M D A 200 3.3 8.0 9.3 4.3 100 4.0 5.0 8.0 2.7 50 1.7 0.0 7.3 0.3 3. Kerbicidal activity 3.1 Pre-emergence control Small greenhouse pots filled with dry soil were seeded with the various weed seeds. Twenty-four hours or less after seeding the pots were sprayed with water until th soil was wet and the test compound formulated as an aqueous emulsion of acetone solution containing emulsifiers was sprayed at eight pounds per acre on the surface of the soil. After spraying, the soil containers were placed in the greenhouse and provided with supplementary heat as required and daily or more frequent watering. The plants were maintained under these conditions for a period of 21 days, at which time the condition of the plants and the degree of injury to the plants was rated on a scale of from 0 to 10, as follows: 0 = injury; 1, 2 = slight injury; 7-9 = severe injury; and 10 = death. The effectiveness of this compound is demonstrated by the data in Table III. 3.2 Post emergence control The herbicidal activity of the compound of this invention was also demonstrated by experiments carried out for the post-emergence control of a variety of weeds. In these experiments the compound was formulated as an aqueous emulsion and sprayed at the indicated dosage on the foliage of the weeds that have attained a prescribed size. After spraying, the plants were placed in a greenhouse and watered daily or more frequently. Water was not applied to the foliage of the treated plants. The severity of the injury was determined 14 days after treatment and was rated on the scale of from 0 to 10 heretobefore described. The effectiveness of the compound is demonstrated by the following data: TABLE III Plant Pre-emergence Post-emergence Rating Rating Velvetleaf 8 8 Pigweed 2 10 Crabgrass 8 7 Barnyard grass 4 7 Yellow foxtail 4 8 The present invention therefore also provides a method of regulating plant growth which comprises applying to the plants or their locus a plant growth regulating amount of the compound of the invention. The amount to be applied will vary depending on the desired effect, the plant locus, plant or plant variety to be treated, mode and time of application, conditions of treatment and the like. The appropriate application rates can be determined by routine experiments by those skilled in the art, or by comparing the activity of the compound of the invention with standards for which the application rate is known, e.g. in greenhouse test. For use as a grape size increaser the compound should be applied in a grape size increasing effective amount. Satisfactory results are in general obtained with application rates of from 5 to 300 grams, more specifically 50 to 100 grams per acre. Above 400 grams per acre the phytotoxicity is excessive. Generally, the compound should be applied at from about 10 days post-bloom to about two weeks prior to the intended harvest time of the grapes. It is conveniently applied in the form of an aqueous solution or dispersion. A suitable application volume is from 5 to 200 gallons per acre. As a defoliant for cotton, the compounds is applied to the cotton plants in defoliating effective amount, e.g. as an aqueous solution preferably containing from about 50 to about 500 ppm of the compound. In order to ensure that an effective amount is applied to the cotton plant, it is applied to run off the plants. It is conveniently applied to the cotton plant from about 10 to about 30 days prior to harvest. For combatting weeds the compound of the invention is applied to the weeds or their locus in a herbicidally effective amount. The compound can be applied before or after emergence of the weeds to be combatted. The compound of the invention may be and preferably is employed as. a plant growth regulating composition in association with agriculturally acceptable diluent(s). Suitable formulations contain 0.01% to 99% by weight of active ingredient, from 0 to 15% surfactant and 1% to 99.99% solid or liquid diluent(s). Higher ratios of surfactant to active ingredient are sometimes desirable and are achieved by incorporation into the formulation or by tank mixing. Application forms of composition generally contain between 0.01, and 25% by weight of active ingredient. Lower or higher levels of active ingredient can, of course, be present depending on the intended use and the mode of application. Concentrate forms of composition intended to be diluted before use generally contain between 2 and 90%, preferably between 10 and 80% by weight of active ingredient. Useful formulations of the compound of the invention include dusts, granulates, suspension concentrates, wettable powders, emulsifiable concentrates and the like. They are obtained by conventional manner, e.g. by mixing the compound of the invention with the diluent(s) and optionally with other ingredients. Alternatively, the compound of the invention may be used in micro-encapsulated form. Agriculturally acceptable additives may be employed in the compositions to improve the performance of the active ingredient and to reduce foaming, caking and corrosion. Surfactant as used herein means a agriculturally acceptable material which imparts emulsifiability, spreading, wetting, dispersibility or other surfacemodifying properties. Examples of surfactants are sodium lignin sulphonate, lauryl sulphate, sorbitan monolaurate and polyoxyethylene oleyl ether. In the aqueous solutions employed, it is preferred to use a surfactant. The surfactant level is generally from 0.1 to 15% by volume of the total formulation and 0.1 to 1.5% by volume is preferred. Diluents as used herein mean a liquid or solid agriculturally acceptable material used to dilute a concentrated material to a usable or desirable strength. For dusts or granules it can be e.g. talc, kaolin ordiamaceous earth, for liquid concentrate forms for example a hydrocarbon such as xylene or an alcohol such as isopropanol, and for liquid application forms i.a. water or diesel oil. The compositions of this invention can also comprise other compounds having biological activity, e.g. compounds having similar or complementary herbicidal activity or compounds having antidotal, fungicidal or insecticidal activity. The invention is further illustrated by the following example. EXAMPLE 1 Preparation of 3-(2-chloropyridin-4-yl )-5-methyl-l-phenyl-l ,3,5-triazin-2-one Formaldehyde (15 mole, 98% aqueous solution) was added dropwise to a mixture of N-(2-chloro-4-pyridinyl)-Nt-phenylurea (3.0 grams; 0.012 mole), methylamine (15 ml, 40% aqueous solution) and methanol (20 ml) in a threenecked reaction flask equipped with stirrer, thermometer and addition funnel. This reaction mixture was stirred for twenty hours at room temperature and then evaporated by Gredwood pressure to give the desired product as a pale yellow oil (4.0 grams). This product analysed as follows: Theoretical (%) Found (%) Carbon 59.50. 57to5 Hydrogen 4.99 5.56 Nitrogen 18.51 19.60

Claims: CLAIMS 1. 3-(2-chloropyridin-4-yl)-5-methyl-1-phenyl-1,3,5-triazin-2-one. 2. A method of regulating plant growth which comprises applying to the plants or their locus a plant growth regulating amount of the compound of Claim 1. 3. The method of Claim 2 for increasing the size of grapes which comprises applying to the grape plants a grape size increasing effective amount of the compound of Claim 1. 4. The method of Claim 3 wherein the compound of Claim is applied to the grapes from about 10 days post-bloom to about 2 weeks prior to harvest. 5. The method of Claims 3 and 4 wherein the amount of the compound of Claim 1 applied to the grape plants is from 5 to 300 grams per acre. 6. The method of Claim 2 for defoliating cotton which comprises applying to the cotton plants a defoliating effective amount of the compound of Claim 1. 7. The method of Claim 2 for combatting weeds which comprises applying to the weeds or their locus a herbicidally effective amount of the compound of Claim Claim 1. 8. A plant growth regulating composition comprising the compound of Claim 1 and a diluent. 9. Process of preparing the compound of Claim 1, which comprises reacting N-(2-chloro-4-pyridinyl )-N'-phenylurea with formaldehyde and methylamine under the conditions of a Mannich reaction. EMI8.1 CLAIMS 1. Process of preparing 3-(2-chloropyridin-4-yl)-5-methyl-1-phenyl-1,3,5- triazin-2-one which comprises reacting N-(2-chloro-4-pyridinyl )-N'-phenyl urea with formaldehyde and methylamine under the conditions of a Mannich reaction. 2. A plant growth regulating composition comprising 3-(2-chloropyridin-4-yl)-5 methyl-l-phenyl-1,3,5-triazin-2-one and a diluent.

Inventors: NICKELL, LOUIS G., STACH, LEONARD J., WU, FRANK
Applicants: SKW TROSTBERG AG
Application year: 1986
Main classification: C07D401
IPC codes: A01N43, C07D401