Showing papers on "Protoporphyrin IX published in 1971"

Coupling of L-histidine methyl ester and L-histidine-containing peptide esters to ferric protoporphyrin IX chloride

Abstract: The coupling of L-histidine methyl ester and L-histidine-containing peptide esters to ferric protoporphyrin IX chloride is performed by the mixed carboxylic–carbonic acid anhydride method to give the disubstituted products in good yield: spectroscopic evidence indicates that the degree of interaction between the imidazole ligands and the iron atom depends upon the length of the peptide chain.

Novel synthesis of deuteriated derivatives of protoporphyrin-IX

Abstract: A new efficient route to protoporphyrin-IX from pyrromethanes is described and employed in the synthesis of the 5,8-hexadeuterio and αγ-dideuterio dimethyl esters.