Routes to meso-substituted thiophen isosteres [(VIII), (IX), and (X)] of porphyrinogens involving interaction of di-2-thienylmethane derivatives are elaborated. The synthesis of thiophen isosteres [(XIV) and (XV)] of the tetrapyrrole system is described and the attempted cyclisation of some of them is discussed.
M. Ahmed and O. Meth-Cohn, J. Chem. Soc. C, 1971, 2104 DOI: 10.1039/J39710002104
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