FIELD: chemistry.
SUBSTANCE: invention relates to the salt N1, N1, N4, N4-tetramethyl-2-butyne-1,4-diamine with 3,6-dichloro-2-pyridinecarboxylic acid of the formula (1) as a herbicide for controlling annual and perennial weeds in agriculture. A new compound is prepared by reacting N1, N1, N4, N4-tetramethyl-2-butyn-1,4-diamine with an equimolar amount of an aqueous solution of 3.6-dichloro-2-pyridinecarboxylic acid at atmospheric pressure and preferably at a temperature of 20-25°C and stirring for 2.5-3.0 hours in a yield of 86-99%.
EFFECT: connection allows to reduce the rate of its consumption without reducing the herbicidal effect, has a high selectivity.
5 cl, 2 tbl, ex 5
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