New 1,2,3-thiadiazole-5-yl-urea derivatives of the formula ##STR1## wherein R.sub.1 is hydrogen or a C.sub.1 -C.sub.4 alkyl group which may be interrupted by one or more sulfur or oxygen atoms, R.sub.2 is a C.sub.1 -C.sub.4 alkyl which may be interrupted by one or more sulfur or oxygen atoms, a cycloaliphatic hydrocarbon group which may be substituted by one or more alkyl groups, an aromatic hydrocarbon group which may be substituted by one or more members of the group consisting of alkyl, halogen, alkyl thio, alkoxy, trifluoromethyl and nitro, or a heterocyclic hydrocarbon group which may be substituted containing at least one nitrogen atom, R.sub.3 is hydrogen, a C.sub.1 -C.sub.10 alkyl group which may be substituted, a C.sub.2 -C.sub.8 alkenyl, an aryl-C.sub.1 -C.sub.2 alkyl, a C.sub.3 -C.sub.8 -cycloaliphatic hydrocarbon group which may be substituted with one or more C.sub.1 -C.sub.6 alkyl groups, and an aromatic hydrocarbon group which may be substituted with one or more members of the group consisting of C.sub.1 -C.sub.6 alkyl, halogen, C.sub.1 -C.sub.6 -alkoxy and trifluoromethyl, and X is oxygen or sulfur. Processes for making these compounds, compositions containing these compounds having plant growth regulating and defoliating activity and methods for using these compounds for these purposes are also disclosed and claimed in the application.
新型1,2,3-
噻二唑-5-基
脲衍
生物的
化学式为##STR1##其中R.sub.1为氢或C.sub.1-C.sub.4烷基,可由一个或多个
硫或氧原子中断;R.sub.2为C.sub.1-C.sub.4烷基,可由一个或多个
硫或氧原子中断,或环脂族碳氢基团,可被一个或多个烷基取代,或芳香族碳氢基团,可被一个或多个烷基、卤素、烷基
硫、烷氧基、三
氟甲基和硝基成员取代,或含有至少一个氮原子的可被取代的杂环碳氢基团;R.sub.3为氢、可被取代的C.sub.1-C.sub.10烷基、C.sub.2-C.sub.8烯基、芳基-C.sub.1-C.sub.2烷基、可被一个或多个C.sub.1-C.sub.6烷基取代的C.sub.3-C.sub.8环脂族碳氢基团,以及可被一个或多个C.sub.1-C.sub.6烷基、卤素、C.sub.1-C.sub.6烷氧基和三
氟甲基成员取代的芳香族碳氢基团;X为氧或
硫。本申请还揭示和声明了制备这些化合物的方法,含有这些化合物的具有植物生长调节和落叶活性的组合物以及使用这些化合物进行这些目的的方法。