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Paper | Regular issue | Vol 41, No. 11, 1995, pp.2553-2564
Published online, 1st January, 1970
DOI: 10.3987/COM-95-7208
Characterization of Decamethyl and Ethoxycarbonyl Pentaphyrins

Richmond E. Danso-Danquah, Lily Y. Xie, and David Dolphin*

*Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, B.C., Canada, V6T1Z1


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.