The article deals with the search for new products of alkylation of 5-morpholino (phenylamino-, p-toluidino-)-1,3,4-thiadiazoline-2-tions with some alkyl halides (allyl bromide, benzyl chloride) and phenoxymethyloxyranes and their potassium salts. The results of the study of plant growth control, herbicide, defoliant properties of drugs prepared based on synthesized compounds are presented. Among the products of these alkylation reactions, it was found that there are drugs that exhibit herbicidal properties and can be used in the future to control weeds.