[β-13C]-, [γ-13C]-, and [δ-13C]-Protoporphyrin-IX dimethyl esters have been synthesised by unambiguous routes from [13C]formaldehyde to allow assignment of the four n.m.r. 13C-signals from the meso-carbons; the dimethyl ester of diacetyldeuteroporphyrin-IX has been similarly studied.
A. R. Battersby, G. L. Hodgson, M. Ihara, E. McDonald and J. Saunders, J. Chem. Soc., Chem. Commun., 1973, 441 DOI: 10.1039/C39730000441
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