SU518106A3 - Herbicide - Google Patents

Description

(54) HERBICID

The invention relates to new chemical means for controlling weeds in crops of cultivated cultivated plants.

It is known to use heterocyclic compounds with two nitrogen atoms in a cycle, for example, pyridazine derivatives, as herbicides. Compounds of this type effectively kill weeds, but are not selective enough for cultivated plants.

It is proposed to use pyrimidine derivatives of general formula I as a new selective herbicide.

t

lA Shg

C1

-TO

where R means alkyl with the number of carbon atoms 2-6, alkenyl with the number of carbon atoms 3-6, cycloalkyl, and X is hydrogen or halogen,

and / or their salts with inorganic or organic acids.

The compounds of formula I effectively kill weeds in maize crops.

wheat, potatoes, onions. They can be used both before and after plant emergence. Effective doses for selective control of weed vegetation are in the range 1-12, preferably 2-6 kg / ha.

The proposed compounds can be applied in the form of conventional formulations, for example solutions, emulsions, pastes, powders or suspensions, prepared by conventional methods.

The method of preparing the considered compounds of formula 1 is based on the reaction of the corresponding 4-amino-2,6-dichloropyrimidines with an aqueous solution of ammonia at 100 ISO.

Salts of these compounds are prepared by ordinary reaction with organic or inorganic acids.

Below are the studied compounds (1-16) of formula I (and their salts).

1 2 3

6

2-amino-4-isopropylamino

chloropyrimidine;

- 6 2-amino-4-isopropylamino chloropyrimidine hydrochloride; 2-amino-4-isopropylamino-6-chlororimidine-trichloroacetate; 2-amino-4-propylamino-6-chloropyrimidine; 2-amino-4-allylamino-6 - chloropyrimidine; 62-amino-4-isobutylamino - 6 - chloropyrimidine; 72-amino-4-amylamino-6-chloropyrim82-amino-4-cyclohexylamino-6-chloropyrimidine; 92-amino-4-butylamino - 6 - chloropyrimidine; 10 2-amino-4-hexylamino-6-chloropyrimidine; And 2-amino-4-0-gor-butylamino-6-chloropyrimidine; 122-amino-4-isopropylamino - 5.6 - dichloropyrimidine; 132-amino-4-bto / -butylamino-6-chloropyrimidine methylsulfonate; 142-amino-4-vgor-butylamino-6-chloropyrimidine sulfate;

The data presented in the table indicate a high herbicidal activity of compounds of formula I in relation to a large number of weeds and on the selectivity of action in relation to a cultivated plant of maize.

Claims (1)

Invention Formula Use of pyrimidine derivatives of the general formula NHR N. , C1 where R is alkyl with 2-6 carbon atoms, alkenyl with 3-6 carbon atoms or cycloalkyl, and X is hydrogen or halo, and / or their salts with inorganic or organic acids as a herbicide. 15 2-amino-4-bto; 0-butylamino - 6 - chloropyrimidine phosphate; 16 2-amino-4-butylamino - 6 - chloropyrimidine-hydrobromide. Example. Post-harvest application. Control plants — shchiritsa, shepherd's bag, mary, bedstraw, starwort, spiderberry, strawberry, and maize were treated with compounds of formula I or their salts with organic or inorganic acids at a dose of 3 kg / ha and the herbicidal activity was recorded on a scale of 1: - no damage, 9 - full of plant death. The test results are presented in the table.