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Formation of a meso-tetraphenylsecochlorin and a homoporphyrin with a twist

TitleFormation of a meso-tetraphenylsecochlorin and a homoporphyrin with a twist
Publication TypeJournal Article
Year of Publication1998
AuthorsBruckner, C, Rettig, SJ, Dolphin, D
JournalJournal of Organic Chemistry
Volume63
Pagination2094-2098
Date PublishedApr
Type of ArticleArticle
ISBN Number0022-3263
Keywordsbeta, CHLOROPHIN, HYDROPORPHYRINS, OXIDATION, PORPHYRIN ANALOG, SYSTEM
Abstract

The osmium tetroxide-mediated dihydroxylation of meso-tetraphenylporphyrin leads to the formation of the vic-diol meso-tetraphenyl-2,3-vic-diol-2,3-chlorin. The corresponding Ni(II) complex was converted by lead tetraacetate into (meso-tetraphenyl-2,3-secochlorinato-2,3-dialdehyde)nickel(II) This novel pigment undergoes an almost quantitative, intramolecular double acetal formation when treated with methanol in the presence of acid to produce a porphyrinoid in which one pyrrolic unit is formally replaced by a six-membered ring. An X-ray crystal structure determination, the first for such a homoporphyrin, reveals the severely twisted conformation of its chromophore.

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