SU668566A3 - Herbicide - Google Patents

Description

The invention relates to chemical agents for controlling weeds and unwanted vegetation, namely, herbicidal compositions containing active substances from the class of organic compounds and auxiliary components from among low or solid carriers, surfactants, etc. Herbicidal compositions based on pyrazole derivatives are known. For example, a composition based on quaternary salts of 1,2-dialkyl-3,5-diphenylpyrazol 1, as well as a composition whose active ingredient is 1,3-dis-scyl-4-benzoyl-5g-hydroxypyrazole 2, is used. However, the known compositions of this group are not sufficiently effective for some resistant species of weeds and are not always selective for cultivated plants. The aim of the invention is a new herbicidal composition based on pyrazole derivatives, having an increased herbicidal activity and selective action. This goal is achieved by using a pyrazole derivative of the general formula BY as the active ingredient of the herbicidal composition, where i is methyl, methoxy, methylthio, cyan or methylsulfonyl; X is fluorine, chlorine, bromine, iodine, methoxy, or dian; Y is hydrogen, fluorine or chlorine; Z is hydrogen or fluorine, in an amount of 0.1-99 wt.%. The agent according to the invention effectively affects many types of weeds and, in certain doses, is selective in abating cultivated plants. The forms of application of the active substances are usual: solutions, emulsions, suspensions, powders, granules, etc., they are prepared by known methods. The method for producing compounds of the formula is based on the reaction of the acid salts of aryl hydrazines with the corresponding fi-ketoester followed by treatment of the resulting pyrazolone with dimethyl sulfate in the presence of a base. They are also obtained from cyclizadne 2- (C5ismethylthio) -methylenecycloalkanonaryl gum raesnov with hydrochloric acid. You can also use a variety of other methods.

Table 1 shows the compounds of the general formula. studied as active substances of the herbicidal composition, and examples illustrating the effectiveness of the latter.

Table l

Continued, 1

Example 1. Seeds of plant experience were sown in prepared soil under greenhouse conditions and treated with active substance preparations before germination.

In another embodiment, test plants grown under greenhouse conditions to a certain stage of development (cotton with five leaves, beans with a third trifoliate leaf, chloris with two leaves, a leafberry with two leaves, oatfishes with a single leaf, and a box with three leaves MI, with four LEAVES ipomes, four-leaf coonshaft, sorghum and corn with three leaves, co and rice with two leaves wheat | Single leaf, nutsedzh, 3-5 leaves) were sprayed with preparations of active ingredients.

After treatment, plants were grown under greenhouse conditions for 16 days, and then the effect was evaluated on a scale of 0-10, where

O - no damage, 10 - full of plant death.

The results of the experiment are presented in table 2. The numbers of the compounds correspond to their numbers in table.1.

For comparison, a known compound with herbicidal activity was used: 1H-pyrazapium-1,2-dimethyl-3, 5-diphenylmethylsulfate Avenge.

table 2

9 9 10.

Example 2. In this experiment, dovsholov and post-emergence methods were treated with rice and wheat sowing, littered with a year, iromey,

ten

1/36 1/16

ten

10 1/8

wild ox and bonfire (additionally aeschynomene).

The results of the experiment are shown in Plz, was evaluated after 3 weeks after treatment

Table 3

Example 4. Experimental plants were treated under greenhouse conditions according to the method before and after emergence. Evaluation was performed 3-4 weeks after treatment. The rating scale is the same as in example 1,

The results of the experiment are presented in table.5.

Spreadsheets

ten

4 2 9

ten

to

12

10 2 2 O

ten

 About 3 3

about

2-3

A herbicidal composition containing the pyrazole eduvod as an active substance, as well as auxiliary components selected from the group of liquid or solid carriers and surfactants, characterized in that, in order to increase the herbicidal activity, it contains as a production pyrazole compound formulas

Y

where R is methyl, methoxy, methylthio cyan or methylsulfonyl; X is fluorine, chlorine, bromine, iodine, methoxy, or cyano group;

Y is hydrogen, fluorine or chlorine;

2 - hydrogen or fluorine, in an amount of 0.1-99 wt.%.

Priority featured:

16.01.76 with R - methoxy, mettio, methylsulfonyl;

X t fluorine, chlorine, bromine, methoxy, cyano group;

Y is hydrogen, fluorine, chlorine;

Z - hydrogen, fluorine.

02.02.76 with R - methyl;

09.09.76 with R - cyano group, X - iodine.

Sources of information taken into account in the examination

1. US Patent I 3922161, cl. 71-92, 1975.

2. The patent of the USSR 552011, cl. D 01 N 9/22, 1975.