A nickel-mediated tandem double cyclization of ethynylene-linked dibromodiporphyrins afforded highly reactive etheno-fused diporphyrins, which undergo a thermal [2+2] cycloaddition at the fused C-C double bond to afford the cyclobutane moiety in X-shaped cyclobutane-linked tetraporphyrins. During the reaction of a Zn(II) complex precursor, the initial double cyclization product was converted into the
                                    镍介导的
乙炔连接的二
溴二
卟啉的串联双环化提供了高反应性的
乙烯稠合二
卟啉,其在稠合的 CC 双键上进行了热 [2+2] 环加成,以提供 X 形
环丁烷连接的四
卟啉中的
环丁烷部分。在 Zn(II) 络合物前体的反应过程中,最初的双环化产物转化为二酮二
卟啉,在环境条件下呈现红色
化学发光。