Under Friedel-Crafts conditions, meso-tetraarylporphyrins give porphyrin spiro dimers in good yield. This reaction involves acylation, acid-catalyzed cyclization, and dimerization. A stable dimer possessing three additional six-membered rings could be isolated and its structure determined. By modifying the substrate and reagents, intermediates could be isolated and characterized. The reactivity of
在Friedel-Crafts条件下,中四芳基
卟啉以良好的产率产生了
卟啉螺二聚体。该反应涉及酰化,酸催化的环化和二聚化。具有三个另外的六元环的稳定二聚体可以被分离并确定其结构。通过修饰底物和试剂,可以分离和表征中间体。底物的反应性,副反应和形成二聚体的浓度要求,所有这些都解释了为什么在广泛使用的内消旋-四芳基
卟啉系列中显然未探索该反应的原因。[反应:看文字]