iodides react with 1-aryl-1-alkynes to afford 9-alkylidene-9H-fluorenes in good yields. This process appears to involve (1) oxidative addition of the aryl iodide to Pd(0), (2) alkyne insertion, (3) rearrangement of the resulting vinylic palladium intermediate to an arylpalladium species, and (4) aryl-aryl coupling with simultaneous regeneration of the Pd(0) catalyst.
在
钯催化剂和NaOAc的存在下,芳基
碘化物与1-芳基-1-
炔烃反应以高收率得到9-亚烷基-9H-
芴。该过程似乎涉及(1)将芳基
碘化物氧化加成至Pd(0),(2)
炔烃插入,(3)将所得
乙烯基钯中间体重排为芳基
钯物质和(4)芳基-芳基与同时再生Pd(0)催化剂。