The synthesis of protoporphyrin-I dimethyl ester (2)via the b-oxobilane route is reported. Fractional crystallisation was unsuccessful in the separation of the dimethyl esters of protoporphyrin-I and protoporphyrin-IX and also the tetramethyl esters of coproporphyrins -I and -III; the significance of these observations, in relation to biosynthetic investigations, is discussed.
J. A. S. Cavaleiro, G. W. Kenner and K. M. Smith, J. Chem. Soc., Perkin Trans. 1, 1973, 2478 DOI: 10.1039/P19730002478
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