The preparation of a meso-thiaphlorin, meso-thiaporphin, and a porphin analogue containing two thiophen rings is described together with several examples of extrusion of sulphur from polypyrrole macrocycles.
M. J. Broadhurst, R. Grigg and A. W. Johnson, J. Chem. Soc. D, 1970, 807 DOI: 10.1039/C29700000807
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