A new synthesis of porphyrins from pyrrole and substituted benzaldehydes, is described, using high-valent transition metal salts [VOCl3, VO(OEt)Cl2, VO(OPri)Cl2, TiCl4 and Mn(OAc)3] as aromatizing agents. This process allows higher working concentrations and larger amounts of reagent to be used, than those previously described.
A. Gradillas, C. del Campo, J. V. Sinisterra and E. F. Llama, J. Chem. Soc., Perkin Trans. 1, 1995, 2611 DOI: 10.1039/P19950002611
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