Syntheses of 2,5-diethyl-7-(2-methoxycarbonylethyl)-1,3,8,δ-tetramethyl-4-propylporphin (IId) and its δ-ethyl homologue (IIc) by the b-bilene method are described. The two porphyrins were fully characterised and easily distinguished, but attempted identification of them with degradation products of Chlorobium chlorophylls (660) fractions 4 and 3 was unsatisfactory.
M. T. Cox, A. H. Jackson and G. W. Kenner, J. Chem. Soc. C, 1971, 1974 DOI: 10.1039/J39710001974
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