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Cross-metathesis of the vinyl group, on tetrapyrrolic macrocycles: Reactivity, selectivity, and mechanism

TitleCross-metathesis of the vinyl group, on tetrapyrrolic macrocycles: Reactivity, selectivity, and mechanism
Publication TypeJournal Article
Year of Publication2008
AuthorsLiu, X, Sternberg, E, Dolphin, D
JournalJournal of Organic Chemistry
Volume73
Pagination6542-6550
Date PublishedSep
Type of ArticleArticle
ISBN Number0022-3263
KeywordsA DERIVATIVES, CATALYSTS, chlorins, OLEFIN METATHESIS, PHOTODYNAMIC THERAPY, PHOTOSENSITIZERS, RUCL2(=CHR)(PR(3))(2)
Abstract

To find a general strategy for modifying the peripheral structure of vinylchlorin and porphyrin substrates, cross-metathes is on the vinyl group of these tetrapyrrolic macrocycles was investigated. The N-heterocyclic carbene-containing ruthenium complex 3 efficiently catalyzed the cross-metathes is (CM) of vinylchlorins and vinylporphyrins with a variety of olefins in high E-stereoselectivity. Different substituents on the olefin dramatically influenced the reaction. While the chlorins were more reactive than the porphyrins (as free bases), the corresponding zinc complexes showed higher activity. The reaction mechanism was investigated, and an empirical model for selective CM was applied to our studies to direct further reactions.

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