The invention relates to novel 2-pyridyl-4,5-dihydro-1,3,4-thiadiazoles of formula ##STR1## wherein A is the 2-, 3- or 4-pyridyl radical, B is hydrogen, C.sub.1 -C.sub.4 alkyl or the 2, 3- or 4-pyridyl radical, R is hydrogen, C.sub.1 -C.sub.4 alkyl, benzyl, aryl or aryl which is substituted by halogen, nitro, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy-C.sub.1 -C.sub.4 alkyl or halo-C.sub.1 -C.sub.4 alkyl. The invention further relates to the preparation of these novel compounds and to the use thereof in pest control.
本发明涉及新型2-
吡啶基-4,5-二氢-1,3,4-
噻二唑的公式##STR1##其中A是2-、3-或4-
吡啶基基团,B是氢、C.sub.1-C.sub.4烷基或2,3-或4-
吡啶基基团,R是氢、C.sub.1-C.sub.4烷基、苄基、芳基或被卤素、硝基、C.sub.1-C.sub.4烷基、C.sub.1-C.sub.4烷氧基-C.sub.1-C.sub.4烷基或卤代-C.sub.1-C.sub.4烷基取代的芳基。本发明还涉及这些新化合物的制备以及在害虫控制中的使用。