FIELD: organic chemistry. SUBSTANCE: invention relates to new compounds that can be herbicide exhibiting the strong activity. Invention describes 5-alkoxy[1,2,4] triazolo[1,5-c] pyrimidine-2-(3H)-thione compounds of the formula (I) 
where one of Y and Z means F, Cl, Br and another means H and R means CH3 or C2H5. Invention describes two methods of synthesis of 2-chlorosulfonyl- -5-alkoxy[1,2,4]triazolo[1,5-c]pyrimidine and a method of synthesis of 2,2'-dithiobis(5-alkoxy)[1,2,4]triazolo[1,5-c]- -pyrimidine). EFFECT: increased yield, improved purity of compounds. 23 cl, 16 ex
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