1,2,3-Thiadiazole-5-yl-urea derivatives of the formula ##STR1## in which R.sub.1 is hydrogen or alkyl of 1 to 5 carbon atoms, R.sub.2 is hydrogen or alkyl from 1 to 5 carbon atoms which latter may also have at least one oxygen or sulfur atom interposed in the carbon chain and wherein R.sub.3 is a heterocyclic hydrocarbon residue in which at least one nitrogen atom is present in the ring, which residue may also be substituted by the same or different substituents comprising alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, halogen, nitro or trifluoromethyl. The compounds are effective as agents for growth retardation and defoliation of plants. The invention also comprises a process of making the product and compositions in which the products are the, or one of the, effective agents.
公式为##STR1##的1,2,3-
噻二唑-5-基
脲衍
生物,其中R.sub.1为氢或1至5个碳原子的烷基,R.sub.2为氢或1至5个碳原子的烷基,后者可能在碳链中插入至少一个氧或
硫原子,其中R.sub.3为杂
环烃残基,在环中至少存在一个氮原子,该残基也可能被相同或不同的取代基取代,包括1至4个碳原子的烷基,1至4个碳原子的烷氧基,卤素,硝基或三
氟甲基。该化合物是植物生长抑制和落叶剂的有效剂。本发明还包括制备该产品的过程以及包含该产品的组合物,或其中的有效剂之一。