4‐Dimethylchromeno[4,3‐d]selenadiazoles 8 with insecticide activities have been synthesized via oxidative ring closure of the corresponding semicarbazone derivatives 7 by treatment with selenium dioxide. Reaction of various alkoxy‐2,2‐dimethyl‐2H‐benzopyrans with phenylselenyl chloride was utilized to prepare different phenylselenyl‐ and 3‐chloro precocene analogs.
通过用
二氧化硒处理相应的半
脲酮衍
生物7进行氧化闭环,合成了具有杀虫活性的4,4-二甲基
铬诺[4,3- d ]
硒代二唑8。各种烷氧基-2,2-二甲基-2- H-苯并
吡喃与苯基
硒烯基
氯的反应被用于制备不同的苯基
硒烯基和3-
氯前茂
金属类似物。