η³-アレニル/プロパルギル錯体の新しい化学

抄録

The chemistry of allenylpalladium and propargylpalladium has been developed to construct use-ful catalytic reactions in organic synthesis. However, the reaction mechanism has not been under-stood well due to the lack of the systematic studies on the allenyl and propargyl complexes of pal-ladium. Thus, the correlation between the coordination mode and the reactivity of η¹-allenyl, η¹-propargyl, η³-allenyl/propargyl and, μ-η³-allenyl/propargyl ligand on palladium or platinum was revealed. Moreover, these coordination modes can be interconverted one another very easily under certain conditions. This easy interconversion generates an intermediate having different coordination mode, which can not be observed but plays a very important role in the key reactions in catalytic cycles, such as isomerization, oxidative addition, and racemization.