Internally-bridged octaphyrin underwent skeletal rearrangement to meso-meso linked porphyrin dimer upon ZnII metalation. This reaction was indeed triggered by hydride-addition reaction to lead to thermodynamically more stable porphyrin framework. Furthermore, β-tetrabromo[36]octaphyrin rearranged to meso-meso, β-β, β-β triply linked porphyrin dimer via a similar mechanism combined with Pd-mediated reductive coupling
在 Zn II
金属化后,内桥八
卟啉发生骨架重排,形成内消旋-内消旋连接的
卟啉二聚体。该反应确实是由
氢化物加成反应引发的,从而产生热力学上更稳定的
卟啉框架。此外,β-四
溴[36]八
菲林通过类似的机制结合Pd介导的还原偶联重排为内消旋、β-β、β-β三联
卟啉二聚体。