SU334659A1 - - Google Patents

Description

BACKGROUND OF THE INVENTION The invention relates to the use of chemical agents for controlling weeds in crops of cultivated plants.

It is known to use substituted benzenes as herbicides, for example, monocyanodinitroanilines or monocyanodinitroalkoxnbenzenes. Compounds of this group have insufficient activity and low selectivity with respect to cultivated plants.

It is proposed to use substituted dicyanonitrobenzenes of the general formula as a new selective herbicide.

groups -NRR or --OR,

in which R is hydrogen, alkyl, oxyalkyl, alkoxyalkyl, alkenyl, cycloalkyl, aralkyl or aryl; hydrogen, alkyl or alkenyl, R and R together with the nitrogen atom is a heterocyclic radical; alkyl.

The proposed compounds effectively suppress a large number of different types of weeds and can be successfully used in cereal, maize and cotton crops. Depending on the dose, the compounds may be herbicides of a continuous or selective action.

The recommended doses for selective control of weed vegetation are 2-10 kg / ha. At a dose of 40-80, these compounds are herbicides with a balancing effect.

Conventional uses (solutions, emulsions, suspensions, pastes or powders).

Methods for preparing the proposed Compounds are based on the interaction of 1-chloro-2,4dicyano-6-nitrobenzene with the corresponding amines or alcohols. In addition, they are obtained by exchange reaction from dicyanonitroanisole and ammonia or an amine. Listed below are the proposed compounds corresponding to the indicated formula.

1.2,4-Dicyano-6-nitroaniline.

2.Y-methyl-2,4-dicyano-6-nitroaniline.

3.Y, M-Dipropil - 2,4-dicyano - 6-nitroannLIN.

7. Y-Allyl-2,4-dicyano-6-nitroaniline.

8.; M-Cyclohexyl - 2,4-dicyano-6-ntroanilin.

9. Y-Benzyl-2,4-dicyano-6-nitroaniline.

10.Y, M-Dimethyl-2,4-dicyano-6-nitroaniline.

11.N, L-Dibutyl-2,4 - dicyano-6 - nitroaniline.

12.Y, M-D. iallyl-2,4-dicyano-6-nitroaniline.

13. M-Pheno IL-2,4-dicyano-6-nitroaniline.

14.1-Morpholino-2,4-dicyano-6-nitrobenzene.

15.1-Methoxy-2,4-dicyano-6-nitrobenzene.

16.1-Ethoxy-2,4-dicyano-6-nitrobenzene.

Example 1. Pre-emergence application.

Seeds of experimental plants are sown in normal soil and after 24 hours they are treated with compounds 1, 2, 3 and 15 in doses of 5 and 10.

3 weeks after treatment, the herbicidal activity is taken into account and evaluated by

The following scale: О - no effect, 1 - light damage, 2 - noticeable damage, 3 - large damage or plants ascended only by 50%, 4 - plants partially destroyed or ascended only by 25%, 5 - full death of plants.

For comparison, known herbicides are used: 1 - methoxy-2,4-dinitro-6-cyanobenzene (A) and N, M-dipropyl-2,4-dinitro-6-cyanoaniline (B). The test results are presented in the table.

The data presented in the table indicate a high herbicidal activity of the proposed compounds. They are much more effective than the known herbicides of this group. Compound 1 has especially good qualities. Even at a dose of 5 kg / ha, it almost completely suppresses weeds, and at a dose of 10 kg / ha it is selective with respect to cultivated plants.

Subject invention

The use of mixed, dicyanonitrobenzenes obsh, her formula

OaN-VVcN

0h /

CN

where X is —RRR or —OR groups in which R is hydrogen, alkyl, hydroxyalkyl, alkoxyalkyl, alkenyl, cycloalkyl, aralkyl or aryl; R is hydrogen, alkyl or alkenyl, R and R together with the nitrogen atom is a heterocyclic radical;

R is alkyl, as a herbicide.