Chemical degradation of the natural bacteriochlorophyll-d homologous mixture to give the corresponding bacteriopetroporphyrin methyl esters is described; 1H n.m.r. spectroscopy of the nickel(II) complexes is used to establish that the pigments are identical with those isolated from immature Messel oil shale.
N. W. Smith and K. M. Smith, J. Chem. Soc., Perkin Trans. 1, 1989, 188 DOI: 10.1039/P19890000188
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