The chemistry of pyrrolic compounds. LV. ¹³C chemical shift data for the isomeric protoporphyrins

Abstract

The ¹³C n.m.r, spectra of the 15 isomeric protoporphyrin dimethyl esters have been determined. Measurements were made on the zinc chelate derivatives of the porphyrins in the presence of pyrrolidine and assignments are given for the side chain and methine carbon atoms.