δ-Aminolaevulinic acid has been synthesised carrying 2H and 3H isotopes at C-2 in the S-configuration; this has been incorporated by Rhodopseudomonas spheroides into bacteriochlorophyll a, degradation of which has established the mode of addition of hydrogen to the precursor vinyl group to form the ring-B ethyl group and that the decarboxylation to form the ring-B methyl group occurs with retention.
A. R. Battersby, A. L. Gutman, C. J. R. Fookes, H. Günther and H. Simon, J. Chem. Soc., Chem. Commun., 1981, 645 DOI: 10.1039/C39810000645
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