β-Acetylporphyrins (e.g. 20, 35, 39) have been treated with Vilsmeier complex (POCl3–DMF) to afford β-(1-chloro-2-formylvinyl)porphyrins (23, 36, 41); with an excess of KOH in methanol these compounds were transformed into the corresponding alkynylporphyrins (17, 37, 38). The bis-alkynyl-porphyrin 17 was transformed into the corresponding hemin 25 by treatment with iron(II) chloride.
X. Jiang and K. M. Smith, J. Chem. Soc., Perkin Trans. 1, 1996, 1601 DOI: 10.1039/P19960001601
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