Characterization of Decamethyl Pentaphyrin and Related Pentaphyrin Derivatives
Danso-Danquah, R.E., Xie, L. and David Dolphin
The syntheses of decamethyl- and ethoxycarbonylpentaphyrins are described. Their spectroscopic characterizations are presented in comparison with the permethyl derivatives of porphyrin, sapphyrin and hexaphyrin. The ethoxycarbonyl-containing pentaphyrins are the only examples, amongst the expanded polypyrrolic macrocycles, that have an electron-withdrawing group directly attached to the macrocyclic ring system. Elimination of a pyrrole and methine carbon unit in the mass spectrometer has been observed as a common feature for the pentaphyrin free bases as well as their metal derivatives.