Studies on Pyridine Derivatives (VII): Synthesis and Insecticidal Activities of Pyridine Derivatives with an 1,3,4-Thiadiazole Moiety

Two series of novel pyridine derivatives Ⅰ and Ⅱ with an 1,3,4-thiadiazole moiety were synthesized. Only Ⅰ g exhibited 90% lethal ratio to Helicoverpa armigera under 2 000 μg/mL after 3 days of administration. All the other compounds were proved to have none insecticidal activity to the tested insects under tested doses.