A broad range of benzophenonehydrazone derivatives was prepared and tested against selected chewing insect pests, allowing the analysis of structure-activity relationships. Good activity was found only when the aromatic rings were substituted at the 4-positions with an halogen atom and a triflate or perhaloalkoxy group. In contrast, a number of substituents on the hydrazone part led to active compounds
Short synthesis of 4-chloro-4′-(chlorodifluoromethoxy)benzophenone
作者:Friedrich Karrer、Hans Meier、Alfons Pascual
DOI:10.1016/s0022-1139(99)00259-6
日期:2000.4
A one-pot, highly selective synthesis of 4-chloro-4′-(chlorodifluoromethoxy)benzophenone suitable for an industrial scale-up was developed. Fluorination of 4-(trichloromethoxy)benzoylchloride at –20°C with HF to 4-(chlorodifluoromethoxy)benzoyl fluoride followed by an in situ Friedel–Craftsreaction with chlorobenzene in the presence of BF3 at –5°C yielded the title compound in excellent yield.