Cleavage of nickel(II) octaethyl-2,3-dihydroxychlorin 3 with lead tetraacetate gives the novel octaethyl-2,3-secochlorin-2,3-dione system as its nickel(II) complex 4, which on treatment with basecyclisesto a novel homoporphyrinone structure 5; electronic spectra are presented: 4 and 5 are seen as representing chromophores that may arise in chlorophyll catabolism.
K. R. Adams, R. Bonnett, P. J. Burke, A. Salgado and M. A. Vallés, J. Chem. Soc., Chem. Commun., 1993, 1860 DOI: 10.1039/C39930001860
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