Synthesis and properties of meso-free N-fused [22]pentaphyrins

Rhodium(I) complexation of meso-free beta-dibromo-N-fused [22]pentaphyrin 3 afforded mononuclear Rh(I) complex 5, whose structure was confirmed by X-ray crystallographic analysis. Hydrodebromination of 3 gave meso-free N-fused [22]pentaphyrin 4 as the first example of beta-unsubstituted meso-free N-fused pentaphyrin. Chlorination of 4 with Palau'chlor afforded the corresponding mono-and dichloropentaphyrins 9 and 10. Their structural identification and electronic properties were reported.