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■ The Comparative Reactions of Forphin, 5-Bromoporphin, 2-Bromoporphin, and 5-Nitroporphin

Louis R. Nudy, Cherylann Schieber, Frederick R. Longo, and Vinod S. Agarwala

*Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, U.S.A.

Abstract

In a continuing study of the aromaticity of the parent parphyrin, porphin, we have conducted the nitration of 5-bromoporphin and the bromination of 5-nitroporphin to determine the presence of substituent directing effects. In addition we have compared the rates of Cu(II) incorporation by these structures with the rate for porphin. Our results substantiate the Fleischer-Webb model for the II-electron pathway in porphin.