Reaction of copper(II) octaethylporphin with ethyl diazoacetate in presence of copper(I) iodide give two isomeric chlorins (III) containg fused cyclopropane rings as well as meso-ethoxycarbonylmethyloctaethylporphin (I; R = CH2·CO2Et).
H. J. Callot and A. W. Johnson, J. Chem. Soc. D, 1969, 749 DOI: 10.1039/C29690000749
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